Free tools for developers
Your online toolbox.
Fast, free, open source.
Format JSON, encode Base64, generate passwords and much more. Everything processed in your browser — no data sent to servers.
100% Secure
Ultra Fast
Always Free
Mobile Friendly
Available tools
Choose your tool
Why ToolsDev?
Privacy guaranteed
All tools process data in your browser. No data is ever sent to our servers.
Native performance
No backend, no latency. Results are instant thanks to pure client-side JavaScript.
Mobile first
Optimized design for smartphones and tablets. Work from any device, anywhere.
Always free
All tools are and will remain free. No sign-up, no usage limits.
Continuously updated
New tools added regularly. Suggest new features via the contact form.
Online tools for developers
ToolsDev was born from the need for reliable, fast and free technical tools. Every tool is designed by developers, for developers.
Our philosophy: 100% client-side processing. Your data is never transmitted to external servers. Everything happens in the browser, in real time.
Available tools
- JSON Formatter — Format, validate, minify and beautify your JSON online for free. Auto-indent, syntax check, statistics. No sign-up, 100% in-browser.
- Base64 Encoder / Decoder — Encode and decode text and files to/from Base64 instantly in the browser. Supports URL-safe Base64. Free, secure, no server upload.
- Password Generator — Generate strong, secure passwords with customizable length and character sets. Real-time strength rating, everything in the browser.
- Regex Tester — Test and debug your regular expressions in real time with match highlighting, capture groups and a built-in cheat sheet.
- Color Converter — Convert colors between HEX, RGB, HSL, RGBA instantly. Integrated color picker, live preview and complementary palette generator.
- Date Calculator — Calculate the difference between dates, add or subtract days, months, years. Convert Unix timestamps. Exclude weekends for working days.
- CSS / JS Minifier — Minify and compress CSS and JavaScript to reduce page weight. Shows byte savings percentage. Everything in the browser, no upload.
- Meta Tag Generator — Generate optimized SEO meta tags: title, description, Open Graph, Twitter Card and robots. Real-time Google and social preview.
- String Converter — Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, URL slug and 20+ more. Word and character counter.
- HTML Editor — Online HTML editor with real-time WYSIWYG preview. Edit code or formatted text, find & replace, strip HTML tags, download .html.