120+ free utilities that run entirely in your browser. No uploads, no signup, no accounts — your inputs never leave the page.
| Category | Examples |
|---|---|
| Developer | JSON / YAML / SQL formatters, regex tester, JWT decoder, Base64, UUID |
| Finance | Loan & mortgage calculators, invoice generator, ROI, VAT, margin |
| Image | Compressor, resizer, cropper, converter, EXIF viewer, color picker |
| Merge, split, rotate, JPG→PDF, PDF→image | |
| Text | Case converter, word counter, diff, slug & lorem generators |
| Design | Color converter, palettes, gradients, contrast checker |
| Security | Password generator & strength, hash generator |
| Date & Time | Date math, Unix timestamp, age & countdown, timezones |
…and more — every tool is one focused page, no clutter.
- Private by design. Everything runs client-side. Files like PDFs and photos are processed in your browser and never sent to a server.
- No friction. No login, no "create an account to download," no upsell wall.
- Fast & free. Static pages, instant load, ad-supported so the tools stay free.
- Site — mello.tools
- X — @mellotools