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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.

CSV to JSON

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

DirectionCSV to JSONJSON to CSV

DelimiterAutoCommaSemicolonTabPipe

First row is headersDetect numbers and booleans

CSV (paste, type or drop a file)

JSON

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CSV to JSON on jigg.dev ↗

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

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