Beautify, validate, and minify JSON data with syntax highlighting and tree view.
Encode and decode text, files, and images to and from Base64 strings.
Convert special characters to percent-encoding (%20, %26) and decode URLs.
Generate random UUID v1, v4, or v5 in bulk with one-click clipboard copy.
Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic checksums online.
Decode, inspect, and verify JSON Web Token header, payload, and signature.
Test and debug JavaScript and Python regular expressions with live highlighting.
Beautify and indent MySQL, PostgreSQL, and T-SQL queries for readability.
Convert epoch timestamps to human-readable dates and timezone strings.
Transform text between camelCase, snake_case, kebab-case, and UPPER_CASE.
Build, test, and translate cron schedule expressions into plain English.
Format and prettify HTML, CSS, JavaScript, and TypeScript code online.
Yes. The developer tools are free for personal and commercial use and do not need an account. They run in your browser, so they do not count towards conversion limits.
No. The developer tools run in your browser with JavaScript; what you paste is not sent to ToolzStack servers. Page visits are still measured with Google Analytics, as described in the Cookie Policy.
Yes. The UUID generator creates up to 100 v4 or v1 UUIDs at a time, which you can copy or download.
No installation is required. Every tool runs natively in modern web browsers across Windows, macOS, Linux, and mobile devices.