Developer Tools
Handy tools for developers: JSON, JWT, regex, cron, chmod, colors, Base64, timestamps, hashes, UUIDs and passwords.
RAID calculatorSee how much usable space you get and how many drives can fail before you lose data.JSON formatterPaste JSON to format it, check it for errors or make it compact.Base64 encoder and decoderConvert text to Base64 and back.Password generatorCreate strong random passwords.Unix timestamp converterConvert Unix timestamps to dates and dates to timestamps.UUID generatorGenerate random UUID v4 or time-ordered UUID v7 in bulk, and check any UUID’s version.Hash generatorGet MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files, make HMACs, and compare checksums.URL encoder and decoderPercent-encode text for URLs or decode it back, and see the parts and query parameters of any URL.JWT decoder and generatorDecode a JSON Web Token, check its expiry, verify the signature with a secret or public key, or create and sign a new token.Cron expression generatorBuild and understand cron schedules: plain-English explanation, the next 10 run times, presets and a syntax cheat sheet.Chmod calculatorConvert Linux file permissions between checkboxes, numbers like 755 and symbols like rwxr-xr-x, and get the chmod command.Regex testerTest regular expressions with live highlighting, match groups and replace preview.Color converterConvert colors between HEX, RGB, HSL, HSV, CMYK and OKLCH, with tints, shades and contrast.Color picker from imagePick any color from a photo or screenshot with a magnifier, and get the main colors of the image.Color palette generatorMake color palettes from one color: harmonies, a 50–950 scale with CSS variables, and random palettes with locks.Color contrast checkerCheck text and background colors against WCAG AA and AAA, and get the closest passing color.
About these tools
Small utilities for developers, sysadmins and anyone working with code and data. They run in your browser and send nothing to a server.