Developer Toolbox
Format JSON, decode JWTs, convert timestamps and diff text, all in your browser.
JSON Formatter 📌 Format, validate and minify JSON with clear error messages. Unix Timestamp Converter 📌 Convert Unix timestamps to dates and back, in seconds or milliseconds. Base64 Encode / Decode 📌 Encode and decode Base64 text or convert files to data URIs. JWT Decoder 📌 Decode JWT header and payload without your token leaving the page. Cron Expression Explainer 📌 Paste a cron expression, read it in plain English and see the next run times. Regex Tester 📌 Test regular expressions with live match highlighting, groups and replace. Diff Checker 📌 Compare two texts and highlight changes line by line or word by word. UUID & Hash Generator 📌 Generate UUIDs and compute MD5, SHA-1, SHA-256 or SHA-512 hashes. Command Line Builder
Beta
📌 Paste a long command, edit each flag and value in its own box, copy it back. URL Encoder / Decoder 📌 Percent-encode or decode text and break a URL into editable query parameters. Data Size Converter 📌 Convert bytes, KB, MB, GB and TB, including binary KiB/MiB/GiB. Color Converter & Contrast Checker 📌 Convert hex, RGB and HSL colors and check WCAG contrast between two colors. Text Case Converter 📌 Convert text between camelCase, snake_case, kebab-case, Title Case and more. Number Base Converter 📌 Convert between binary, octal, decimal and hex with exact 64-bit+ precision. QR Code Generator 📌 Make a QR code from text, a link or wifi credentials, as PNG or SVG. Password Generator 📌 Generate strong random passwords and passphrases locally, with an entropy readout. Time Zone Converter 📌 Pick a time in one city and see the local time in others, day shifts included.
Developer utilities without the upload risk
Every tool here runs as plain JavaScript in your browser, so nothing you paste is sent to a server. Pin the tools you use daily with the pin button, or press Cmd/Ctrl+K anywhere to jump straight to one.