Processed locally
JSON Formatter & Validator
Format, minify and validate JSON with precise syntax errors.
Developer tools.
Local by default.
Format, convert, inspect and compare developer data with fast local tools.
Available now
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Processed locally
JWT Decoder & Inspector
Decode JWT headers and claims, inspect dates and explain token structure.
Processed locally
Regex Tester
Test regular expressions, flags, matches, groups and replacements safely.
Processed locally
Cron Expression Builder
Build and explain standard five-field cron expressions with upcoming runs.
Processed locally
Unix Timestamp Converter
Convert Unix seconds, milliseconds and readable dates in both directions.
Processed locally
Text & Code Diff Checker
Compare two text blocks with inline additions and removals.
Private processing
Useful work, without an upload queue.
Every tool in this category runs on your device. Each page loads only the engine it needs and labels unsupported browser features honestly.
Inputs stay in memory for the current tab and generated download URLs are cleared when you leave.