Your tokens and queries never leave this tab
Developer tools that don't phone home
Six everyday utilities that run entirely inside this page. Nothing is sent to a server, so nothing can be logged, cached or leaked.
JSON formatterPretty-print or minify, with the parse error pointed at exactly.JWT decoderRead the header and payload of a token, and when it expires.Base64 encoderEncode or decode text, including emoji and other non-ASCII.UUID generatorGenerate v4 UUIDs in bulk, from the browser’s own CSPRNG.Regex testerMatch as you type, with every group and index shown.SQL formatterIndent a query readably across eight SQL dialects.
Why that matters more here than elsewhere
The things you paste into developer tools are rarely harmless. A JWT is a live credential until it expires. A SQL query describes your schema. A JSON payload is often a real customer record. Most online tools post all of it to a server to do the work.
Everything on this site runs in your browser instead, so a token you decode here cannot be logged by us, because it never arrives. You can confirm that: open your network tab and watch it stay empty while you work.
- No account
- No upload
- Works offline