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Font previewer
Try Google Fonts with your own text, pair a heading font with a body font, and copy the link and CSS.
Big text
Type a message and show it as large as the screen allows, fullscreen and upside down for across the counter.
Chord finder
Pick a chord and see the easiest ways to play it on guitar or ukulele, with diagrams you can hear.
Reaction time test
Wait for green, tap as fast as you can, and get your median over five tries; your best stays in this browser.
SSH key generator
Make an Ed25519 or RSA key pair in OpenSSH format, with its fingerprint, without the key leaving your browser.
CSV viewer
Open a big CSV to sort, filter and count by column, with sums and averages; nothing is uploaded.
JSON query
Run a jq filter or a JSONPath against pasted JSON and see the result as you type.
SVG optimizer
Shrink an SVG, compare before and after, and copy it as a file, data URI, CSS or React component.
Type scale generator
Pick a body size and ratio for small and large screens and get fluid clamp() font sizes from small print to h1.
Certificate decoder
Paste a PEM certificate, chain or CSR to see its names, issuer, key, expiry and fingerprints, and check a hostname against it.
URL inspector
Split a link into its parts, edit the query string as a table, strip tracking parameters and copy the rebuilt URL.
Table converter
Paste cells from a spreadsheet, CSV or a Markdown table and get Markdown, HTML, CSV or a plain-text grid.
Loan calculator
Monthly payment, total interest and a full amortization schedule, with what extra payments save.
Team picker
Split a list of names into fair random teams, balanced by rating if you like, with captains picked too.
Stair stringer calculator
Riser height, step count, total run and stringer length from the total rise, checked against common code limits.
Material estimator
How much paint, drywall, flooring, tile or bagged concrete a room or slab takes, with a waste allowance.
Chmod calculator
Tick read, write and execute to get the octal and symbolic mode, or paste 755, -rwxr-xr-x or u+x to decode it.
Semver checker
Check which versions satisfy a range like ^1.4 or ~2.0.3, and see what the range means in plain comparators.
Interval timer
Pomodoro, Tabata or your own work and rest rounds, with countdown beeps and the screen kept awake.
Board foot calculator
Add up lumber by the board foot from thickness, width and length, with a waste allowance and a price for the total.
Miter & angle calculator
Miter angles for frames and polygons, miter and bevel for splayed boxes, and crown molding settings for any corner.
Sun times
Sunrise, sunset, golden hour, blue hour and twilight for any city or your location, on any date.
JSON to types
Paste sample JSON and get TypeScript interfaces or a zod schema, with optional and nullable fields worked out.
Text cleaner
Fix pasted text in one go: smart quotes, odd spaces, extra blank lines, duplicates, sorting and case.
Tape measure calculator
Add, subtract and divide feet, inches and fractions like 3' 5 5/8", rounded to the nearest 1/16 or finer.
Cut list optimizer
Lay out the parts you need on the boards or sheets you have, with saw kerf, and see the offcuts and waste.
IP list tools
Merge, dedupe and sort a list of IPs, CIDRs and ranges, subtract another list, and check whether an address is on it.
Metronome
Keep time with accents, subdivisions, a tempo trainer that speeds up as you go, and silent bars to test yourself.
Image cropper
Crop a photo to an exact size for Instagram, YouTube, a profile picture or any ratio, then download it.
Screenshot framer
Drop a screenshot and put it on a gradient with padding, a shadow and a browser or phone frame, ready to post.
Guitar & ukulele tuner
Tune a guitar, ukulele or bass with your microphone: see the note and how sharp or flat it is, with a metronome.
PDF merge & split
Combine PDFs, reorder, rotate or delete pages, or pull pages out into a new file; nothing is uploaded.
Wheel spinner
Paste a list of names and spin the wheel to pick one, with a link that keeps the list.
Favicon maker
Turn one image into favicon.ico, an Apple touch icon and app icons, with the HTML to add them, in one zip.
Barcode maker
Make EAN-13, UPC-A and Code 128 barcodes and download them as PNG or SVG.
Typing speed test
Measure your words per minute and accuracy, and see which keys you miss most.
Fake data generator
Make realistic test users, addresses and orders as JSON or CSV, the same every time from a seed.
Paste link
Turn text into a link that carries it, compressed and optionally locked with a password; nothing is stored anywhere.
Photo privacy check
See the hidden metadata in a photo, like GPS location, camera and date, then download a clean copy.
Mic & camera check
Test your webcam, microphone level and speakers before a call, and record a short clip to hear yourself.
Social card maker
Design a 1200×630 share image with a title, colors and your logo, then download it as a PNG.
Subnet calculator
Turn an IPv4 or IPv6 CIDR into its address range, mask and host count, and split it into smaller subnets.
Gradient & shadow maker
Drag to build a CSS gradient or box shadow, then copy the CSS or the Tailwind class.
Countdown
Count down to any date and time, and share a link that keeps counting for whoever opens it.
YAML to JSON
Convert YAML to JSON and back, with errors pointed out by line.
SQL formatter
Format SQL for Postgres, MySQL, SQLite, BigQuery and more, with your choice of keyword case and indent.
Camera color picker
Point your phone's camera at anything and get its hex code and closest color name, live.
Workbench
Chain tools into a pipeline: CSV to JSON, format, encode, hash and more, with every step's output shown.
QR scanner
Scan a QR code with your camera or from a screenshot, and see what's inside before you open it.
Color blindness simulator
See an image or a set of colors the way people with red, green or blue color blindness do.
Aspect ratio calculator
Simplify any size to its ratio, and resize to a ratio without doing the math.
Date difference
Count the years, months, days and weekdays between two dates, or add days to a date.
CSV to JSON
Convert CSV to JSON and back, with quoted fields, delimiter detection and typed values.
Number base converter
Convert whole numbers between binary, octal, decimal, hex and any base up to 36.
Color palette
Turn one color into a full 50-950 scale and matching harmonies, then export it as CSS or Tailwind.
Markdown preview
Write Markdown with GitHub's extras and see it rendered live, then copy the HTML.
Unit converter
Convert length, weight, temperature, volume, area, speed, data and time, all at once.
Hash generator
Get MD5, SHA-1, SHA-256, SHA-384 and SHA-512 of text or a file, and check it against a hash.
Crontab editor
Build a cron schedule by clicking, read it in plain English, and see exactly when it runs next.
JWT decoder
Read a JSON Web Token's header and claims, see when it expires, and check an HMAC signature.
UUID generator
Make UUID v4, v7 or ULID IDs in bulk, and inspect any ID to see its version and timestamp.
Text diff
Compare two texts line by line, with the changed words highlighted.
Image compressor
Shrink and resize images to WebP, AVIF or JPEG right in your browser; nothing is uploaded.
Regex tester
Test a regular expression live, see every match and group, and read it in plain English.
Encode & decode
Convert text to and from Base64, URL encoding and HTML entities.
Contrast checker
Check two colors against WCAG AA and AAA, and get the nearest color that passes.
Word counter
Count words and characters, see reading time, and check social post limits.
Time zones
Find a meeting time that works across cities, hour by hour.
JSON formatter
Pretty-print, minify and sort JSON, with errors pointed out by line.
QR code maker
Turn a link, text or Wi-Fi login into a QR code you can download.
Password generator
Make a strong random password; it never leaves your browser.
Timestamps
Convert Unix timestamps to dates and back, in UTC and your time zone.
Random color
Roll a random color and copy it as hex, RGB or HSL.
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JSON formatter
JSON formatter
Pretty-print, minify and sort JSON, with errors pointed out by line.
Indent
2 spaces
4 spaces
Tabs
Minify
Sort keys
Input
Output
Paste some JSON to start.
Copy output
Ctrl+Enter
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CSV viewer
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YAML to JSON
Convert YAML to JSON and back, with errors pointed out by line.
CSV to JSON
Convert CSV to JSON and back, with quoted fields, delimiter detection and typed values.
JWT decoder
Read a JSON Web Token's header and claims, see when it expires, and check an HMAC signature.
JSON formatter on tools.cterry.dev ↗