25 free tools · 100% in your browser
The developer toolbox
that never sees your data
Format, decode, convert and generate the things you work with every day. Everything runs locally, so tokens, configs and customer data never leave your machine.
Most used
The tools developers reach for first.
Format, validate and minify JSON with exact error locations and a collapsible tree view.
Open toolDecode JWT headers and payloads, check expiry and verify HS256/384/512 signatures.
Open toolBuild HTTP requests with params, headers, auth and body. Send them from your browser and copy the request as cURL, fetch or raw HTTP.
Open toolTest regular expressions against your text with live match highlighting, capture groups and replace preview.
Open toolFormat SQL for MySQL, PostgreSQL, SQL Server, Oracle, SQLite and more. Choose keyword case and indentation.
Open toolConvert Unix timestamps in seconds, milliseconds, microseconds or nanoseconds to readable dates, and dates back to timestamps.
Open toolBrowse by category
25 tools across 24 categories, with more on the way.
No uploads, no logs, no accounts. Your input is processed by JavaScript in this tab and nowhere else.
Results update as you type. Pages are pre-built static HTML that load in milliseconds.
Exact error locations, sensible defaults, copy and download buttons, and dark mode everywhere.