About Useful Hacks
Useful Hacks is a collection of 226+ free tools across 17 categories — developer utilities, PDF and image tools, finance calculators, text tools, converters and generators. The goal is simple: the tool you need should open, work, and get out of your way.
No signup, ever
Every tool works the moment you open it. We don't gate features behind an account.
Private by default
Wherever technically possible, processing happens in your browser using native Web APIs — your files and text are never uploaded.
No dark patterns
No fake countdown timers, no upsell modals blocking the tool, no forced newsletter popups.
Built to be accurate
Every calculator shows its formula. Every converter uses standard, documented conversion factors — not black-box numbers.
A note on accuracy
Finance calculators on this site are for planning and educational purposes — they are not financial advice. Formulas and assumptions are documented on each calculator's page so you can verify the math yourself.
When a tool processes files or text entirely in your browser, we say so explicitly on that tool's page. When a feature genuinely requires server-side processing to work reliably, we mark it as such rather than pretend otherwise.
We use privacy-respecting usage analytics and performance monitoring to see which tools get used, where people get stuck, and how fast pages load. It records page views, anonymous interaction counts and timing data — never the contents of your files, text or searches — and honours “Do Not Track” and Global Privacy Control. The full detail, and how to turn it off, is in our Privacy Policy.