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. All 70+ developer utilities on ToolzStack are 100% free for both personal and commercial use without registration or API limits.
No. Almost all developer tools (such as JSON formatting, Base64 encoding, UUID generation, and Regex testing) execute locally inside your browser using JavaScript and WebAssembly. Your data never leaves your computer.
Yes. Our UUID generator and hash tools support bulk generation and multi-line batch processing.
No installation is required. Every tool runs natively in modern web browsers across Windows, macOS, Linux, and mobile devices.