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.
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Time & Clocks 07
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.
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 18
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.
Text & Dev 34
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.
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 and PDFs, 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.
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.
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.
Fun & Lottery 27
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.
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.
Sugoroku Maker
Create original sugoroku board games and share via URL instantly. Set tile types, money effects freely. No sign-up, no server storage, 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 24
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.
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 swap candidates.
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.
Print & Paper 04
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 05
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.