Developer Tools
Format, decode, generate and test — JSON, Base64, UUIDs, regex, JWTs and more, right in your browser.
JSON Formatter & Validator
Format, minify and validate JSON instantly — with exact error positions when something's wrong.
Open toolBase64 Encode / Decode
Convert text to Base64 and back — UTF-8 safe, so emoji and non-English characters survive.
Open toolURL Encoder / Decoder
Percent-encode text for URLs or decode %20-riddled strings back into readable text — live.
Open toolUUID Generator
Generate cryptographically secure UUID v4 identifiers — one at a time or 100 in bulk.
Open toolRegex Tester
Test regular expressions live — matches highlighted in your text, capture groups listed below.
Open toolJWT Decoder
Decode JWT header and payload instantly — with human-readable expiry dates. Nothing leaves your browser.
Open toolMarkdown Preview
Write Markdown on the left, see rendered output on the right — live, side by side.
Open toolDiff Checker
Compare two texts and see every added and removed line highlighted — like git diff, in your browser.
Open toolHTML Entities Encoder / Decoder
Escape text for safe HTML display, or decode &-riddled text back to readable characters.
Open toolHex Converter
Convert text to hex bytes and back, or decimal to hexadecimal — exact at any size, thanks to big-integer math.
Open toolBinary Converter
Text to binary and back, or decimal to binary — 8-bit bytes, exact big-integer math.
Open toolMorse Code Translator
Translate text to Morse code and back — and hear it played aloud at proper timing.
Open toolCSV ↔ JSON Converter
Convert CSV to JSON and back — with real CSV parsing that handles quotes, commas and line breaks in fields.
Open toolJSON to YAML Converter
Convert JSON to YAML and back — clean output, both directions, entirely in your browser.
Open toolJSON Diff Checker
Compare two JSON documents structurally — see exactly what was added, removed or changed, at every level.
Open toolCron Expression Parser
Translate any cron expression into plain English and see the next run times — with common presets.
Open toolHTTP Status Codes
A searchable reference of every HTTP status code — meaning, category and common causes.
Open toolUnix Timestamp Converter
Convert Unix timestamps to readable dates and back — auto-detects seconds vs milliseconds, live current-epoch ticker.
Open tool