Days Until Countdown
How many days until Christmas, a birthday or an exam. List several events nearest first and show one full screen. Times and days since are supported too. Share by link; saved on this device.
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Most used tools 19
Time & Clocks 11
Flip Clock
A retro flip clock whose number cards flip as the time changes. Go full screen to turn a laptop or tablet into a big desk clock that keeps the screen awake. 12/24-hour, seconds, date and four card colors.
Sand Timer
A timer that displays a beautiful hourglass on your screen. Watch the sand flow while you focus, cook, or run a quick game.
Countdown Timer
A beautiful countdown timer you can blow up to full screen. Great for streams, events, and classrooms where everyone watches the clock together.
Pomodoro Timer
A Pomodoro timer that cycles 25-minute focus sessions and 5-minute breaks automatically, with a long break every 4 rounds. Fullscreen countdown, sound and notifications, and today's count — a focus and study timer.
Presentation Timer with Bells
A presentation timer that rings bells 1, 2 and 3 with a desk-bell sound. Set bells before or after the end of the talk, or pick conference, lightning talk and interview presets. Big countdown, green/yellow/red stages and overtime display.
Multi Timer
A Gantt-chart style multi-timeline timer to manage multiple kitchen appliances at once. See all finish times at a glance and share settings via URL.
Digital Clock
An immersive full-screen digital clock. Mix clock styles, theme colors, 24h/12h, seconds, font weight, Zen Mode, and auto theme switching to build your ideal focus clock.
Analog Clock
An immersive full-screen analog clock. Mix face styles, theme colors, second hand, smooth ticking, date, and Zen Mode to build your ideal focus clock.
Stopwatch
A full-screen online stopwatch with a large, legible display. Start, stop, lap, and reset with one click. Combine styles, theme colors, and milliseconds freely.
Metronome
Browser metronome with 30–300 BPM, 1–12 beats per bar, subdivisions (quarter/eighth/triplet/sixteenth) and three click sounds. Tap tempo, space-bar control, visual beats and URL sharing.
Image & Video 24
PhotoBatch
Batch-prep photos before posting: unify size with adjustable crops, mosaic & emoji stamps, auto-enhance filters, and WebP/JPEG/PNG conversion — with an X-style editor for finishing each shot. EXIF & GPS removed automatically; everything runs in your browser.
LocalCanvas
Apply mosaic, crop, and export images entirely in your browser without uploading them. Built for privacy-first local processing.
Local Video Editor
A no-sign-up, fully in-browser video editor that cuts segments from several videos, lines them up, and composites captions and BGM into one MP4. No upload; loads 4K and outputs Full HD.
Video Converter
Convert WebM, MOV and other videos to MP4 (H.264), WebM (VP9) or animated GIF right in your browser. Pick a resolution and quality to shrink videos too. Videos are never uploaded to a server.
WebP Converter
Convert PNG and JPEG images to the lightweight, high-quality WebP format right in your browser. Batch convert without uploading anything.
Image Converter
Convert WebP back to PNG or JPEG — and the other way, in bulk. Choose the background color when flattening transparency to JPEG. Images never leave your browser.
MP4 Fast Start
Convert non-progressive MP4 files to Fast Start in your browser. Reorders the moov atom to the front—no re-encoding, so quality and size are preserved.
HLS/DASH Stream Checker
Paste an .m3u8, .mpd or MP4 URL to check whether it plays in the browser. Diagnoses CORS, HTTP status, encryption and codecs, shows the variant ladder and segment download speeds, and shares the exact state via ?url= query parameters.
Video Timestamp Notes
Open a video in your browser, pause and type to build a time-ordered list of timestamped feedback. Range notes, colour-coded types and thumbnails; export as Markdown, CSV or an HTML report. Nothing is uploaded.
EXIF Cleaner
Remove EXIF metadata (GPS location, timestamp, camera info, etc.) from your images entirely in the browser — no upload required. Supports JPEG, PNG, WebP, and HEIC.
Color Palette
Automatically extract dominant colors from any image and generate a color palette. One-click copy of HEX / RGB / HSL, auto-generate Tailwind config, and preview your palette in a live UI mockup. No upload required — runs entirely in your browser.
Image Merge
Combine several images into one as a vertical strip, a horizontal strip or a grid. Reorder them, set spacing and a background colour (transparent allowed), match widths or heights, and export as PNG, JPEG or WebP. Nothing is uploaded.
Batch Watermark
Add a text or logo watermark to many images at once and save them as a ZIP. Tune size, colour, opacity, angle, one of nine positions or a full tile, with a live preview. Nothing is uploaded.
Image & Print Size Calculator
Turn an image's pixel count into printed sizes from 72 to 350 dpi in mm and inches, and check it against 4×6, 5×7, postcard, B5, A4 and A3. Also works backwards from paper and dpi, and converts px ⇔ mm ⇔ inch ⇔ pt.
SVG Converter
Convert SVG to PNG, JPEG, WebP, GIF, BMP, ICO, TIFF or PDF. It draws straight from the vector, so any scale stays sharp, and ICO can pack 16–256 px into one favicon file.
Image to PDF
Combine JPG, PNG, WebP and other images into one PDF in any order. Choose A4, Letter and other page sizes, orientation and margins. JPEGs are embedded without recompression and phone photo rotation is fixed.
PDF to Image
Convert each PDF page into PNG, JPEG or WebP at 72–600 dpi with adjustable quality. Choose page ranges and download everything as a ZIP. Renders Japanese and other CJK PDFs correctly.
Audio Converter
Convert MP3, WAV, M4A, FLAC or a video's audio into WAV, M4A (AAC) or WebM (Opus). Trim, convert to mono and change the sample rate. Your audio is never uploaded.
Melody Sketchpad (Piano Roll & MIDI)
Find the tune in your head on an on-screen piano, record it note by note, fix it in a piano roll and export WAV or MIDI. A scale guide shows the keys that fit. Stays on your device; great for Suno uploads.
Background Remover
Remove photo backgrounds with AI and get transparent PNGs. The AI runs in your browser, so images are never uploaded. Batch processing with ZIP, background color/image/blur replacement and erase/restore brushes.
Passport & ID Photo Maker
Make passport, visa and ID photos from a phone snapshot: pick the size, let AI swap the background to white or light blue, and lay several copies out on a 4×6 in print with cut lines. Your photo is never uploaded.
Profile Picture Maker
Turn a photo into a round, rounded or square profile picture with solid or gradient borders, AI background replacement, and every social media size plus a favicon in one ZIP. Your photo is never uploaded.
Image to Text (OCR)
Extract Japanese and English text from images, screenshots, photos and scanned PDFs. Paste with Ctrl+V, select an area, read vertical text and batch several images – nothing is uploaded.
Audio & Video Transcription
Transcribe meetings, interviews and video audio with Whisper entirely in your browser – nothing is uploaded. Export timestamped text or SRT/VTT subtitles, or record from your microphone.
Text & Dev 50
Internet Speed Test
Press one button to measure download and upload speed in Mbps plus ping and jitter, against the nearest Cloudflare location. Keep a history of results on this device.
Chinese to Pinyin Converter
Convert Chinese text to pinyin with tone marks, tone numbers, no tones or first letters, shown above each character for printing. Correct characters with several readings with a click. Works with traditional characters.
HTML, CSS & JS Minifier
Minify HTML, CSS and JavaScript by stripping spaces, line breaks and comments. Shows the size before and after, the savings and the gzipped size, and points to syntax errors by line and column. Nothing is uploaded.
Furigana Converter
Add furigana to Japanese text automatically. Skip kanji learned up to a school grade, show only non-Joyo kanji, fix readings with a click, export as ruby HTML or kana, and print vertical or horizontal.
Character Counter
Paste your text and instantly see characters, lines, paragraphs, words, and manuscript page counts. Perfect for social drafts and writing — runs entirely in your browser.
Keigo Converter
Free tool that turns casual Japanese into polite keigo drafts. Three modes plus a business NG-phrase checker. No sign-up — runs entirely in your browser.
Desu/masu ⇔ Da/dearu Converter
Free tool that converts Japanese between polite (desu/masu) and plain (da/dearu) styles both ways in one click. Style-mix checker and quote protection. No sign-up — runs entirely in your browser.
Fuseji Censored-Text Generator
Free tool that batch-masks names and titles in Japanese text with fuseji symbols (〇〇, 佐〇…) to dodge search. Auto-suggests proper nouns, 4 modes × 6 styles. No sign-up — your text never leaves the browser.
Kaomoji ⇔ Emoji Converter
Convert kaomoji text faces like (^^) to emoji 😊 and emoji back to kaomoji, a whole message at a time. Hand-picked pairs for about 70 feelings plus a face parser for unknown kaomoji. Pick alternatives, copy. Runs entirely in your browser.
Romaji Converter
Hiragana, katakana and kanji to Hepburn, Kunrei or passport-style romaji. Kanji readings resolved in the browser; long-vowel and capitalization options; kana chart included.
Full-width ⇔ Half-width
Convert letters, digits, symbols, katakana and spaces between full-width and half-width, choosing which types to change. Merges half-width katakana voicing marks; hiragana ⇔ katakana too.
Markdown Table Generator
Paste TSV/CSV from Excel or spreadsheets and instantly convert to a formatted Markdown table. Smart alignment, transpose, ASCII art output, and keyboard shortcuts. Browser-based, free.
Markdown Preview
Write Markdown and see a real-time preview. Export to PDF with a beautiful layout. Supports GFM (tables, task lists, strikethrough), auto-save. No upload, no registration, free.
Text Diff Checker
Compare two texts, code snippets, or JSON side by side in your browser. Switch between character, word, and line granularity; ignore whitespace or newlines; auto-format JSON; export an HTML diff report. Fully local, free.
Table Converter
A developer-grade table converter. Converts between TSV, CSV, Markdown, and JSON. Auto-infers column types to generate TypeScript Interface, Zod schema, and SQL DDL. Rich preview for color codes, URLs, and emojis. Fully local, no data sent.
CSV Encoding Converter & Splitter
Fix CSVs that look garbled in Excel by converting to UTF-8 with BOM or Shift_JIS, with automatic encoding detection. Split by rows or size with headers, pick columns, convert CSV ⇔ JSON. Handles tens of MB with no upload.
Mermaid Editor
A browser-based diagram editor using Mermaid.js. Create flowcharts, sequence diagrams, and more—saved locally across multiple files.
Base64 Converter
Convert text and files to and from Base64. Auto-detects encode vs. decode, previews images (PDFs and other files are detected and offered as a download), and generates img, CSS, and Markdown snippets. Drag & drop supported. Fully local, free.
HTML Escape / Unescape
Escape and unescape HTML special characters (& < > " ') with automatic direction detection, plus a breakdown of what changed. Supports named, decimal, and hex character references. Fully local, free.
Regex Tester
A fully local regex tester that runs in your browser. Real-time match highlighting, capture group extraction, sanitize & copy to mask sensitive data, CLI command generation for grep/sed/awk/rg, and an infra-ready prefab library. Runs entirely in your browser; your data is not sent to any server.
Timestamp Converter
Convert UNIX timestamps and dates both ways. Extract time from Snowflake, ULID, UUIDv7, and ObjectId, parse logs in bulk, and do date arithmetic and diffs. Fully in-browser, free.
Cron Generator
A fully local Cron schedule generator. Describes 5-field cron expressions in plain English, shows upcoming run times, and generates copy-ready YAML / Bash for GitHub Actions, Kubernetes, Docker, and AWS EventBridge. Your data is not sent to any server.
Dummy Data Generator
Generate up to 100,000 rows of dummy JSON / CSV data right in your browser. Includes niche Japan-specific types like fictional My Number, invoice registration numbers, and traditional Japanese colors.
Local Mask
Auto-detect and mask sensitive data — names, emails, phones, addresses, card numbers, API keys — fully in your browser, then restore in one click. Safe prep before pasting into ChatGPT or Claude. Nothing is uploaded.
Password Generator
Generate secure passwords in your browser (crypto.getRandomValues, nothing sent to a server). Random strings, memorable passphrases and PINs, with honest entropy and crack-time estimates plus a NATO spell-out table for reading passwords aloud.
Colour Contrast Checker
WCAG contrast ratio for any two colours, with AA/AAA verdicts for normal and large text plus the 3:1 for UI components, a live preview, and the nearest passing colour when a level fails.
CSS Generator
Build gradients (linear/radial/conic), multi-layer box shadows with inset, stripe/dot/checker background patterns, and per-corner radius with borders — live preview, one-click CSS copy.
QR Code Reader
Read QR codes from dropped, pasted or camera-captured images. Detects URLs, email, phone, Wi-Fi (SSID/password) and contacts, and shows a link's domain before you open it. Nothing is uploaded.
What Is My IP
Shows the public IP address (IPv4 or IPv6) your connection is using, the country and network it maps to, and your browser's user agent, languages and screen size. The IP is never logged or stored.
Number Base Converter (Binary, Hex)
Convert between binary, octal, decimal and hexadecimal as you type, with a bit view, two's complement for negative numbers and support for very large numbers. Runs in your browser.
JSON Formatter & Validator
Paste JSON to pretty-print or minify it. Syntax errors are shown with line and column, plus sort keys, a collapsible tree view and copyable JSON paths. Everything runs in your browser; nothing is uploaded.
URL Encoder & Decoder
Percent-encode text or URLs and decode strings like %E3%81%82 back to readable text. Choose component or full-URL encoding, and split or build query parameters. Runs in your browser; nothing is uploaded.
Case Converter (camelCase, snake_case)
Convert text between UPPER, lower, Title and Sentence case, plus camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE. Works line by line for variable names, file names and headings.
Webcam Test
Check your webcam instantly: live preview with the real resolution and frame rate, camera switching, mirror view and snapshots. Handy before a meeting or class. Video never leaves your device.
Mic Test
See whether your microphone works with a live level meter and waveform, then record a few seconds and play it back. Switch mics, spot clipping and compare noise suppression on/off. Nothing is uploaded.
Speaker Test
Check left/right channels and the frequency range of speakers or headphones: left, right and center test sounds, a frequency sweep, a tone generator and a high-frequency audibility check.
Keyboard Tester
Every key you press lights up on an on-screen keyboard. Find dead keys, test key rollover (how many keys at once) and catch key chatter (double input). US and JIS layouts, with key and code values.
Dead Pixel & Refresh Rate Test
Find dead, stuck and hot pixels with full-screen solid colors, and measure your monitor's real refresh rate (Hz). Also shows resolution, pixel ratio, color depth and HDR support.
DNS Lookup
Look up a domain's A, AAAA, CNAME, MX, TXT, NS, SOA and CAA records with TTLs, with SPF highlighted and DMARC fetched automatically. Queries go straight from your browser over DNS over HTTPS.
robots.txt Checker
Fetch and parse a site's robots.txt into a table of Allow, Disallow, Sitemap and Crawl-delay directives, then test any path against Googlebot and Bingbot with full longest-match, * and $ support.
SEO & OGP Checker
Enter a URL to audit its title, description, canonical, noindex, h1 and structured data plus Open Graph and X card tags, preview the search snippet and share cards, and check the OG image size.
SSL Certificate Checker
Enter a domain to fetch its SSL/TLS certificate: days until expiry, issuer, SANs, the full chain, TLS 1.0–1.3 support and the verification result (expired, hostname mismatch, self-signed).
IP Address Lookup
Look up any IPv4 or IPv6 address: its type (public, private, CGNAT, reserved), reverse DNS name, and the organization, country and range from RDAP. Add a CIDR prefix to get subnet details.
Code Preview
Write HTML, CSS and JavaScript and see the result as you type. console.log and errors appear in a console pane, and you can check phone (375px), tablet (768px) or full width. Export as one HTML file.
Test Combination Generator
Turn factors and levels into a test matrix: the full cartesian product plus a pairwise set covering every two-factor combination. Compare the counts, exclude impossible pairs, copy as CSV, Markdown or TSV.
HTTP Status Codes
A searchable reference of 89 HTTP status codes from 100 to 599. Filter by number, name or meaning and see whether each is cacheable and may carry a body, plus notes on 301 vs 308, 404 vs 410 and non-standard codes from nginx and Cloudflare.
QR Code Capacity Chart
Capacity for QR versions 1-40 by error-correction level across all four modes. Paste a string to get the smallest version, module count and print size. The figures are measured with a QR library, not copied.
Mojibake Generator
Reproduce mojibake in ten encodings, or paste garbled text and have the encoding guessed and the original restored. When recovery is impossible the page explains why. Runs in your browser.
Barcode Number Checker
Enter a JAN, EAN, UPC or ISBN to get the format, whether the check digit is right, and which country registered the prefix. Calculates check digits and converts between ISBN-10 and ISBN-13.
JWT Decoder & Hash Generator
Decode JWT header and payload, show exp/iat/nbf as dates with time remaining, verify HS256 with a secret or RS256/ES256 with a public key (PEM/JWK). Hash text and files with MD5, SHA-1, SHA-256/384/512 and HMAC, and compare checksums. Nothing is uploaded.
Fun & Lottery 34
Maze Generator
A maze game that makes a new maze every time. Play 5×5 to 40×40 solvable mazes with arrow keys, swipes or tracing. Show the answer, print on A4 with an answer page, save PNG, or share the same maze by link.
Amidakuji
A multilingual Amidakuji (ghost-leg lottery) for 2 to 200 players, with group-split mode, adjustable density, reveal animation, URL sharing, image export, and local history.
Omikuji Maker
Create your own custom omikuji fortune and share it with friends. Set fortunes and messages, generate a short URL. No login required.
Lucky Draw
A full-featured lottery drum machine. Manage prize inventory, spin with animation and sound effects, and share settings via URL or JSON. Kiosk mode included. Runs entirely in your browser.
Bingo Machine
A real bingo machine that runs in your browser. Press the button and a random number is drawn. Fullscreen mode makes it perfect for parties and kids' events.
Bingo Card Generator
Make free printable bingo cards: 75-ball number cards, 3×3 kids cards or word bingo with your own words. 1–200 numbered cards with no duplicates, 1, 2, 4 or 6 per page or as a PDF, plus a winner checker.
Dice Roller
A real 3D dice roller in your browser. Roll 1 to 6 dice at once, with auto sum and history. Great for board games, RPGs, and quick decisions.
Coin Toss
Flip a coin with cryptographic randomness — strictly 50:50. Toss multiple coins, set custom labels, sound feedback, and share settings via URL.
Roulette & Duty Maker
Add items and spin. A roulette wheel for fair random decisions — chores, rotas, dinner menus and more. Adjust item weights, use duty-rotation mode, save as image, and share via URL. Fully browser-based, no sign-up, free.
Random Number Generator
Pick random numbers in any range — no duplicates, exclusions, sorting, decimals, up to 1,000 at once. Draw mode shows one number at a time fullscreen with no repeats, for raffles, bingo and classrooms.
Random Name Picker
Paste a list of names and pick one at random — names spin and land huge on a projector or fullscreen. Remove picked names so nobody goes twice, pick groups, undo and keep a history. Your list stays in the browser.
Online Scoreboard
A fullscreen online scoreboard for projectors and TVs. Tap to score, 2–4 teams, 2/3-point steps, undo, swap sides, a game timer and keyboard shortcuts — for classrooms, quiz nights and pickup games.
Quiz Buzzer (with Sound Effects)
A quiz buzzer for one computer or tablet shared by 2–8 players. Each player gets a keyboard key and a big on-screen button; once the host opens the question, the first press is shown huge. False starts, correct (ding-dong) and wrong (buzz) with scoring, plus drum roll, applause and other sound effects for parties and quiz nights.
Word Wolf
Pass-and-play Word Wolf on one phone: 3–10 players, 1–2 wolves, a discussion timer, voting, the wolf's last-chance guess and running scores. 200+ family-friendly word pairs, plus your own.
Sugoroku Maker
Create original sugoroku board games and share via URL instantly. Set tile types, money effects freely. No sign-up, plays in your browser, up to 8 players.
Tournament Bracket
Auto-generate a tournament bracket from a list of participants. Automatic seeding and BYEs, click to advance, share progress via URL. No sign-up required.
Team & Seat Maker
Auto-generate team splits and seating charts from a member list. Balance by gender or skill, set no-pair constraints, drag to swap, share via URL. No sign-up required.
Seating Chart Maker
Random classroom seating chart from rows × columns and names. Front-row requests, keep-apart pairs and aisles; reveal mode uncovers one seat at a time. Print, image and share URL.
Secret Cipher Maker
Transform your messages into emoji ciphers using a secret passphrase. Have fun exchanging secret messages with friends!
Zalgo Text Generator
Free Zalgo (cursed/glitch) text generator with a built-in remover. Adjust intensity with three sliders and restore garbled text — all in your browser.
Fancy Text Generator
Free fancy text generator: 22 font-like Unicode styles (𝐛𝐨𝐥𝐝, 𝓼𝓬𝓻𝓲𝓹𝓽…) previewed at once with one-tap copy and social compatibility hints — all in your browser.
Typing Sushi Chef
A brutally hard typing game: 10-second limit, instant death on a typo. Type the romaji of sushi toppings and release the last letter on the gold PERFECT band to press each piece. Race your own ghost. Records stay in your browser, free.
Sushi Set Maker
Free tool to build your ideal sushi lineup and eating order from 57 conveyor-belt-chain staples. Drag to reorder, save named sets in your browser, share with a URL. No sign-up, nothing sent to a server.
Takoyaki Master
A free takoyaki game that realistically recreates a 9-hole grill's uneven heat and the half-flip technique. Juggle a hot center and cool corners, turn each ball 90° twice to hit that golden window, collect cheese, mochi and the rare giant octopus, and compete on a daily stall. No sign-up, records stay on your device.
Finger Doodle
A super-simple free drawing toy for ages 1+. Trace to draw rainbow lines, tap to pop bubbles, and everything fades on its own so the canvas never fills up — no cleanup. No color picker: every touch makes a beautiful color. Pleasant sounds (can be off), a grown-up lock and full screen guard against mishaps. No sign-up, no install, no ads, records stay on your device.
Flame Color Fireworks
Learn the chemistry of flame tests while designing and launching your own fireworks. Blend metals, choose shape and burn temperature, and share recipes by URL. Quests plus sound and wind effects. Runs in your browser, no signup, free.
Pochi Pochi Planet
A keyboard sound-and-light play toy for toddlers — every key press fills the screen with colorful animations and fun synthesized sounds. No install, completely free.
Minecraft Map Tool
Plan coordinates across Overworld, Nether, and End with local-only markers and Nether gate links.
Shaved Ice Maker
Pick a bowl, syrup, toppings and flag to build your own shaved ice. Seven syrups including strawberry, melon, blue Hawaii and matcha, plus condensed milk and rice dumplings. Save it as an image or share the URL.
Cotton Candy Maker
Choose the colour, size, stick and decorations to make cotton candy. The rainbow option layers five shades, and you can add stars, hearts or a face. Save it or share the URL.
Crepe Maker
Pick the batter, cream, fruit, sauce and wrapper to build a crepe. Up to three fruits, plus ice cream and biscuit sticks, with the sauce drizzled on last.
Candy Apple Maker
Choose the fruit - apple, crab apple, strawberry, grape or mandarin - and the candy colour. The candy is drawn translucent so the fruit shows through. Up to three toppings.
Chocolate Banana Maker
Pick the banana shape, chocolate, toppings and a face. Five chocolates drawn with a dripped edge, and the face line switches colour to stay readable on any of them.
Fantasy Currency & Unit Maker
Design the currency or measurement tiers of your own world and get a conversion table, with breakdowns like "1234 copper = 5 gold, 2 silver, 10 copper". Share the setup by URL.
Life & Calc 32
White Noise & Focus Sounds
Background sound for study and work. Layer white, pink and brown noise with rain-, wave-, wind- and campfire-like sounds, set each volume, and use a 15–90 minute timer that fades out. All synthesized in your browser.
What Week Is It?
Open it and see today's ISO 8601 week number, day of the year, days left and week of the month. Check any date, look up the dates of a week number, and list every week of the year.
Daily Routine Pie Chart
Type your activities with start and end times and get a 24-hour pie chart laid out like a clock. Overnight sleep, free time and overlaps handled. For school routine charts and time audits. Save PNG/SVG, print, or print a blank circle.
Classroom Noise Meter
A classroom noise meter for your projector: a needle meter, bouncing balls or a traffic light show Quiet, OK or Too loud. Adjustable limits, too-loud alerts and a quiet timer with goals. Nothing is recorded or uploaded.
Bill Splitter
Even or weighted bill splitting from just the total and headcount. Rounding, a remainder roulette, and QR/URL setup sharing. In-browser, no sign-up, free.
Recipe Scaler
Paste ingredients to scale recipes by servings or ratio. Back-calculate seasonings from target salt %, convert g ↔ tbsp/tsp. Browser-based, no sign-up, free.
Salt & Seasoning Calculator
Enter dish weight and target salt % to instantly calculate how much soy sauce, miso, dashi, and 17 other seasonings you need—in grams and tablespoons. Presets, custom seasonings, and URL sharing. Browser-only, free.
Unit Converter & Calculator
Type “100cm” or “3 mi” to instantly convert across every unit in 8 categories—length, weight, area, temperature and more, including Japanese tsubo and shaku. Doubles as a calculator. Browser-only, free.
Room Simulator
Place furniture, fixtures, and appliances to simulate room layout and movement flow directly in your browser.
Maintenance Log
A browser-only maintenance log for bikes and cars. Record by voice, transfer between devices via QR/URL, generate a share card image, and auto-calculate service intervals by vehicle class. No registration, free.
Japanese Zodiac & Age
Look up the Japanese zodiac, Western/kazoe age, Japanese era, yakudoshi, longevity celebrations, school years, and generation from any birth year. Searchable 1920-2050 table.
One-Tap Timestamp Maker
Record everyday routines with a single tap, stored locally in your browser. Multiple targets, start/stop tracking, elapsed time display, undo, and webhook integration. Fully browser-based, free.
Study Pacemaker
Free study planner that turns a deadline and question count into the daily/weekly pace and finish date you need. Log questions per day, drill with spaced repetition, and branch off for sudden tasks. Data stays in your browser.
REWARD//DASH
A time-attack dashboard: declare your work hours and rewards first, then race to finish early and win free time. Earliest finish and today's buffer update in real time. Data stays on your device, no signup, free.
Workday Countdown
Count down to your deadline in actual workdays, subtracting weekends, holidays and your own days off. Add tasks to get the pace you need per day. Multiple projects, no signup, data stays in your browser. Free.
Age Calculator
Exact age in years, months and days on any date, days lived, next birthday, zodiac, Japanese era and school entry/graduation years. Save family members to compare ages.
Date Calculator
Days, weeks, months and years between two dates with weekday/weekend breakdown, plus "N days / business days / months from a date" with the weekday. For deadlines and anniversaries.
BMI & Calorie Calculator
BMI with category, ideal weight, basal metabolic rate (Mifflin-St Jeor / Harris-Benedict), daily calorie needs (TDEE) and calorie targets for losing or gaining weight, updated as you type.
Compound Interest Calculator
Future value and total interest from principal, monthly contributions, annual rate and years, with a year-by-year table and chart. Also solves the monthly amount needed to reach a target.
Price Calculator
Tax-inclusive ⇔ tax-exclusive prices, discount rate ⇔ sale price, and cost/price ⇔ gross margin and markup, all on one screen and updated as you type. Rounding is selectable.
Fraction Calculator
Fraction arithmetic with the working shown (common denominators, reciprocals, simplification). Mixed numbers and decimals accepted; results as fraction, mixed number and decimal.
Probability Calculator
Permutations and combinations, gacha/lottery odds of at least k successes in n trials, deck draw odds without replacement, and expected value with standard deviation, all with distribution tables.
Ratio & Percentage Calculator
Simplify ratios, split totals by ratio (whole-unit rounding keeps the total), percent of / percent change / value after change, and proportions a:b = c:x, as you type.
Standard Deviation & T-Score Calculator
Paste a list of scores to get the mean, standard deviation (population and sample), z-scores, T-scores and ranks, or enter one score with the mean and SD. Shows the approximate percentile. Nothing is uploaded.
Speed, Distance & Time Calculator
Enter any two of speed, distance and time to get the third. Mix units like km/h, mph, m/s, hours, minutes and seconds, and see the working. Handy for homework and travel estimates.
World Clock & Time Zone Converter
See the current time in cities around the world side by side. Convert a date and time across time zones and find a meeting slot that works for everyone, with daylight saving time handled automatically.
Slope & Angle Calculator
Convert between angle, grade %, 1:n ratio, radians and roof pitch, and solve the slope triangle from run and rise. Includes ramp, road, roof and stair references with a labelled diagram.
Prime Factorization & Divisors
Factor any integer into primes with ladder-division working and 2³×3²×5 exponent form. Lists every divisor with the count and sum, tests primality, and finds the GCD and LCM of several numbers.
To-Do List
A to-do list that saves in your browser – no sign-up. Enter to add, tick to complete, double-click to edit, reorder by arrows or drag. Overdue items turn red, #tags filter, and it prints as a checklist.
Battery Size Chart
A searchable chart of cylindrical, coin, button and hearing-aid batteries with dimensions and voltage. Search by designation, alternative name (AG13, 357) or use, and see cells of the same size with similar voltage (within 0.2V).
Mohs Hardness Chart
Mohs hardness for gems and minerals listed with cleavage and toughness, plus everyday references like glass and household dust. Pick two and see which scratches which.
Loan Repayment Calculator
Monthly payment and total interest for mortgages, car loans and personal loans. Compare annuity and equal-principal repayment, see the full amortization schedule (CSV), bonus payments, prepayment (shorter term vs lower payment), rising-rate scenarios and how much you can borrow.
Print & Paper 05
Class Timetable Maker
Make a weekly class timetable by day and period. Subjects get matching colors automatically, with room and teacher if you like. Print on one A4 landscape page, save PNG or share by link.
Repeat Label Printer
Print name stickers, price tags, badges and simple cards on plain copy paper—no label sheets needed. Choose how many fit on a page and get cut lines, crop marks, sequential numbers and mail merge. Browser-only, free.
Voucher Maker
Print numbered vouchers, prize tickets and queue tickets on A4, complete with an auto-generated check-off list of the serial numbers — track handouts and redemptions with pen and paper. Optional stubs and QR codes. Browser-only, free.
PrintForge
A print-focused suite with a box dieline generator and a UI sketch grid sheet. Configure dimensions and print at true scale.
Desk POP Generator
Arrange text and images to create tabletop POP stand dieline PDFs. Preview in 3D and print at true scale.
Work & Events 12
Graph Maker (Bar, Line, Pie)
Type numbers into a table or paste from Excel or Google Sheets and get a bar, horizontal bar, stacked, line, pie or donut chart instantly. Colorblind-safe palette, axis from zero. Save PNG/SVG, copy image, print, share by URL.
Queue Number Display
Show the queue number being called in huge digits on a projector or TV. Next plays a ding-dong chime with optional spoken announcements, plus a pickup board for ready orders, prefixes, counter names and a called list. Open the customer display in a separate window, synced with your control screen.
Offline POS Register
A browser-only POS register and inventory that works with zero connectivity: barcode scanning, checkout, stock, sales CSV, QR sync between devices and Bluetooth receipt printing. Once opened it runs offline, and data stays on the device.
Event QR Tickets & Check-in
Bulk-generate unique QR tickets for an event and check guests in with a phone camera. Hand them out by print, image ZIP or merged into a flyer PDF; repeat entries are flagged automatically. PC-to-phone sync, and it runs offline once opened.
Stamp & Punch Card
Run stamp cards and punch cards from the browser. Print member QR cards, scan them on each visit to record stamps, rewards and punch-card uses. No app or sign-up for customers, and it runs offline once opened.
Duty Roster Maker
Fair duty rotation for cleaning, daily duty and chores. Days off, no consecutive turns, no double duty. Print, image, CSV and share URL.
Shift Schedule Maker
Monthly shift schedule from days off, weekly limits and headcount per shift. Consecutive-day limits and closed days; understaffed days in red. Print, image, CSV and share URL.
QR Code Maker
Generate QR codes for URLs, text, Wi-Fi, contacts and calendar entirely in your browser. Color/logo customization, batch ZIP export, PNG/SVG save.
Merge PDF
Put several PDFs in the order you want and merge them into one. Shows page counts and thumbnails, and copies pages as they are so quality is kept. Nothing is uploaded — it all runs in your browser.
Split PDF & Extract Pages
Extract the pages you need from a PDF, split it into single pages or every N pages (as a ZIP), and rotate or delete pages. Pick from thumbnails or type ranges like 1-3, 5, 8-. No upload.
Organize PDF (Reorder, Compress, Password)
Drag to reorder PDF pages, rotate, delete, duplicate and insert blank pages. Compress images to shrink the file, add or remove a password (AES-256) and strip metadata — on one screen, with no upload.
LED Scrolling Text Banner
Type a message and it scrolls across your phone screen like an LED sign. LED dots or bold text, red, green, yellow, white or rainbow, background color, speed, blink or a fixed message. Fullscreen, keeps the screen awake and shares by link — for concerts, airport pickups and shop signs.