What's new
Tools we added recently, newest first — 57 in the last 60 days.
7 tools
- Work & Events 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.
- Work & Events 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.
- Image & Video 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.
- Image & Video 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.
- Image & Video 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 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.
- Text & Dev 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).
12 tools
- Text & Dev 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.
- Life & Calc 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.
- Fun & Lottery 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.
- Fun & Lottery 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.
- Fun & Lottery 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.
- Text & Dev 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.
- Fun & Lottery 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.
- Life & Calc 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.
- Text & Dev 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.
- Text & Dev 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.
- Fun & Lottery 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.
- Fun & Lottery 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.
8 tools
- Text & Dev 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.
- Text & Dev 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.
- Text & Dev 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.
- Text & Dev 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.
- Life & Calc 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.
- Text & Dev 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.
- Image & Video 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.
- Life & Calc 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.
21 tools
- Life & Calc 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.
- Life & Calc 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.
- Life & Calc 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.
- Text & Dev 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.
- Text & Dev 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.
- Life & Calc 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.
- Life & Calc Fraction Calculator Fraction arithmetic with the working shown (common denominators, reciprocals, simplification). Mixed numbers and decimals accepted; results as fraction, mixed number and decimal.
- Image & Video 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.
- Time & Clocks 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.
- Life & Calc 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.
- Image & Video 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.
- Life & Calc 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.
- Text & Dev 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.
- Life & Calc 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.
- Text & Dev 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.
- Fun & Lottery 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.
- Work & Events 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.
- Life & Calc 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.
- Work & Events 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.
- Image & Video 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.
- Text & Dev 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.
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- Text & Dev 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.
- Life & Calc 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.