Developer Tools

Everyday utilities for developers and designers. Generate QR codes and barcodes, decode and sign JWTs, generate UUIDs and NanoIDs, test regular expressions, hash text, parse cron expressions, convert Unix timestamps and pick colors.

16 free tools · no account required · works on any device.

Barcode Generator Free barcode generator: create EAN-13, UPC-A, Code 128, Data Matrix and Aztec barcodes with custom size and colors, then download a PNG. No signup. Color Palette Generator Free color palette generator: create shades, monochromatic, analogous, complementary and triadic color schemes from any base color, with HEX codes. Color Picker Free online color picker: choose any color and instantly get its HEX, RGB and HSL codes ready to paste into CSS, HTML or your design tool. Cron Expression Parser Free cron expression parser: check a 5-field cron schedule and preview its next run times. Supports *, lists, ranges and step values like */15. Epoch Converter Free epoch converter: turn any date and time into a Unix epoch timestamp in seconds and milliseconds, or get the current epoch time. Runs in your browser. GUID Validator Free GUID and UUID validator: check whether a value is a valid GUID/UUID with or without braces and hyphens, and see its version and variant. Hash Generator Free hash generator: create MD5, SHA-256 and SHA-512 hashes of any text in your browser. Your text never leaves your device. Optional uppercase output. JWT Decoder Free JWT decoder: paste a JSON Web Token to view its decoded header and payload claims like exp, iat and sub. Decoded locally; your token stays private. JWT Generator Free JWT generator: create a signed JSON Web Token from a JSON payload and secret using HS256, HS384 or HS512. Signed in your browser for testing. Minify JSON Free JSON minifier: remove all whitespace and line breaks from JSON to make it as small as possible for APIs, config files and storage. Validates as it goes. NanoID Generator Free NanoID generator: create short, secure, URL-friendly random IDs with a custom length and alphabet. Generate one or many at once in your browser. Pretty Print JSON Free JSON pretty printer: beautify minified JSON with 2-space, 4-space or tab indentation so it's easy to read and debug. Errors are explained clearly. QR Code Generator Create free QR codes for URLs, WiFi networks, vCard contacts, email, SMS and phone numbers. Add a logo, colors and frames, then download a PNG. Regex Tester Free regex tester: test a JavaScript regular expression against sample text and list every match with its position and capture groups. Supports all flags. Unix Timestamp Converter Free Unix timestamp converter: convert a Unix timestamp in seconds or milliseconds to a human-readable date and time in UTC and your local time zone. UUID Generator Free UUID generator: create random version 4 UUIDs (GUIDs) one or hundreds at a time, in lowercase or uppercase, with or without hyphens.

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