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Font previewerTry Google Fonts with your own text, pair a heading font with a body font, and copy the link and CSS.

Big textType a message and show it as large as the screen allows, fullscreen and upside down for across the counter.

Chord finderPick a chord and see the easiest ways to play it on guitar or ukulele, with diagrams you can hear.

Reaction time testWait for green, tap as fast as you can, and get your median over five tries; your best stays in this browser.

SSH key generatorMake an Ed25519 or RSA key pair in OpenSSH format, with its fingerprint, without the key leaving your browser.

CSV viewerOpen a big CSV to sort, filter and count by column, with sums and averages; nothing is uploaded.

JSON queryRun a jq filter or a JSONPath against pasted JSON and see the result as you type.

SVG optimizerShrink an SVG, compare before and after, and copy it as a file, data URI, CSS or React component.

Type scale generatorPick a body size and ratio for small and large screens and get fluid clamp() font sizes from small print to h1.

Certificate decoderPaste a PEM certificate, chain or CSR to see its names, issuer, key, expiry and fingerprints, and check a hostname against it.

URL inspectorSplit a link into its parts, edit the query string as a table, strip tracking parameters and copy the rebuilt URL.

Table converterPaste cells from a spreadsheet, CSV or a Markdown table and get Markdown, HTML, CSV or a plain-text grid.

Loan calculatorMonthly payment, total interest and a full amortization schedule, with what extra payments save.

Team pickerSplit a list of names into fair random teams, balanced by rating if you like, with captains picked too.

Stair stringer calculatorRiser height, step count, total run and stringer length from the total rise, checked against common code limits.

Material estimatorHow much paint, drywall, flooring, tile or bagged concrete a room or slab takes, with a waste allowance.

Chmod calculatorTick read, write and execute to get the octal and symbolic mode, or paste 755, -rwxr-xr-x or u+x to decode it.

Semver checkerCheck which versions satisfy a range like ^1.4 or ~2.0.3, and see what the range means in plain comparators.

Interval timerPomodoro, Tabata or your own work and rest rounds, with countdown beeps and the screen kept awake.

Board foot calculatorAdd up lumber by the board foot from thickness, width and length, with a waste allowance and a price for the total.

Miter & angle calculatorMiter angles for frames and polygons, miter and bevel for splayed boxes, and crown molding settings for any corner.

Sun timesSunrise, sunset, golden hour, blue hour and twilight for any city or your location, on any date.

JSON to typesPaste sample JSON and get TypeScript interfaces or a zod schema, with optional and nullable fields worked out.

Text cleanerFix pasted text in one go: smart quotes, odd spaces, extra blank lines, duplicates, sorting and case.

Tape measure calculatorAdd, subtract and divide feet, inches and fractions like 3' 5 5/8", rounded to the nearest 1/16 or finer.

Cut list optimizerLay out the parts you need on the boards or sheets you have, with saw kerf, and see the offcuts and waste.

IP list toolsMerge, dedupe and sort a list of IPs, CIDRs and ranges, subtract another list, and check whether an address is on it.

MetronomeKeep time with accents, subdivisions, a tempo trainer that speeds up as you go, and silent bars to test yourself.

Image cropperCrop a photo to an exact size for Instagram, YouTube, a profile picture or any ratio, then download it.

Screenshot framerDrop a screenshot and put it on a gradient with padding, a shadow and a browser or phone frame, ready to post.

Guitar & ukulele tunerTune a guitar, ukulele or bass with your microphone: see the note and how sharp or flat it is, with a metronome.

PDF merge & splitCombine PDFs, reorder, rotate or delete pages, or pull pages out into a new file; nothing is uploaded.

Wheel spinnerPaste a list of names and spin the wheel to pick one, with a link that keeps the list.

Favicon makerTurn one image into favicon.ico, an Apple touch icon and app icons, with the HTML to add them, in one zip.

Barcode makerMake EAN-13, UPC-A and Code 128 barcodes and download them as PNG or SVG.

Typing speed testMeasure your words per minute and accuracy, and see which keys you miss most.

Fake data generatorMake realistic test users, addresses and orders as JSON or CSV, the same every time from a seed.

Paste linkTurn text into a link that carries it, compressed and optionally locked with a password; nothing is stored anywhere.

Photo privacy checkSee the hidden metadata in a photo, like GPS location, camera and date, then download a clean copy.

Mic & camera checkTest your webcam, microphone level and speakers before a call, and record a short clip to hear yourself.

Social card makerDesign a 1200×630 share image with a title, colors and your logo, then download it as a PNG.

Subnet calculatorTurn an IPv4 or IPv6 CIDR into its address range, mask and host count, and split it into smaller subnets.

Gradient & shadow makerDrag to build a CSS gradient or box shadow, then copy the CSS or the Tailwind class.

CountdownCount down to any date and time, and share a link that keeps counting for whoever opens it.

YAML to JSONConvert YAML to JSON and back, with errors pointed out by line.

SQL formatterFormat SQL for Postgres, MySQL, SQLite, BigQuery and more, with your choice of keyword case and indent.

Camera color pickerPoint your phone's camera at anything and get its hex code and closest color name, live.

WorkbenchChain tools into a pipeline: CSV to JSON, format, encode, hash and more, with every step's output shown.

QR scannerScan a QR code with your camera or from a screenshot, and see what's inside before you open it.

Color blindness simulatorSee an image or a set of colors the way people with red, green or blue color blindness do.

Aspect ratio calculatorSimplify any size to its ratio, and resize to a ratio without doing the math.

Date differenceCount the years, months, days and weekdays between two dates, or add days to a date.

CSV to JSONConvert CSV to JSON and back, with quoted fields, delimiter detection and typed values.

Number base converterConvert whole numbers between binary, octal, decimal, hex and any base up to 36.

Color paletteTurn one color into a full 50-950 scale and matching harmonies, then export it as CSS or Tailwind.

Markdown previewWrite Markdown with GitHub's extras and see it rendered live, then copy the HTML.

Unit converterConvert length, weight, temperature, volume, area, speed, data and time, all at once.

Hash generatorGet MD5, SHA-1, SHA-256, SHA-384 and SHA-512 of text or a file, and check it against a hash.

Crontab editorBuild a cron schedule by clicking, read it in plain English, and see exactly when it runs next.

JWT decoderRead a JSON Web Token's header and claims, see when it expires, and check an HMAC signature.

UUID generatorMake UUID v4, v7 or ULID IDs in bulk, and inspect any ID to see its version and timestamp.

Text diffCompare two texts line by line, with the changed words highlighted.

Image compressorShrink and resize images to WebP, AVIF or JPEG right in your browser; nothing is uploaded.

Regex testerTest a regular expression live, see every match and group, and read it in plain English.

Encode & decodeConvert text to and from Base64, URL encoding and HTML entities.

Contrast checkerCheck two colors against WCAG AA and AAA, and get the nearest color that passes.

Word counterCount words and characters, see reading time, and check social post limits.

Time zonesFind a meeting time that works across cities, hour by hour.

JSON formatterPretty-print, minify and sort JSON, with errors pointed out by line.

QR code makerTurn a link, text or Wi-Fi login into a QR code you can download.

Password generatorMake a strong random password; it never leaves your browser.

TimestampsConvert Unix timestamps to dates and back, in UTC and your time zone.

Random colorRoll a random color and copy it as hex, RGB or HSL.

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cterry.dev tools

Small, free tools by Caleb Terry. No sign-up, nothing stored.

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