About JustConvert

JustConvert is a free, browser-based suite of 94 converter tools built for developers, writers, and everyday users. Free Online Text & Data Converter Tools — fast, private, and without any signup friction.

Our mission

We believe the best utility tools stay out of your way. JustConvert is designed around a single principle: paste your input, get your output — instantly, in your browser, with no account required.

Whether you need to convert JSON to YAML, resize an image, decode a JWT, generate a UUID, or convert between timezones, JustConvert provides a consistent, keyboard-friendly interface across every tool.

How it works

Every conversion runs entirely inside your browser using standard Web APIs — no server round-trips, no file uploads, no cloud processing. Your data stays on your device.

• Text and data tools use JavaScript string manipulation, the TextEncoder API, and open-source libraries like js-yaml, papaparse, and marked.
• Image tools use the browser Canvas API to resize, crop, filter, and convert images without any server upload.
• Crypto tools use the Web Crypto API for hashing (SHA-1/256/384/512), HMAC, and UUID generation.

Our principles

• Privacy first — Input data is never sent to any server
• No account required — Every tool works immediately, no signup
• Keyboard friendly — / or Ctrl+K to search, Ctrl+Enter to copy
• Consistent interface — Same layout and controls across all tools
• Always free — Supported by non-intrusive advertising

Tool categories

• Encoding — Base64, URL encode/decode, HTML entities, ROT13, Morse code
• JSON — Format, diff, validate, convert to YAML/CSV/TSV/TypeScript/HTML
• Text — Case converter, word counter, diff, regex tester, Lorem Ipsum, and more
• Dev — JWT encoder/decoder, hash generator, UUID, cron parser, color converter
• Image — Resize, compress, crop, filter, flip/rotate, ASCII art, color palette

Open and improving

JustConvert is continuously expanding. New tools are added regularly based on user feedback and common developer needs. If a tool you need is missing, reach out via the contact page.