Every DO101 tool
95 free tools for PDFs, images, documents, text, code, maths and play. Almost every one runs entirely in your browser, so your files never leave your device — and none of them need an account.
How the DO101 toolbox is organised
Every tool has its own page with the working tool at the top and a plain-language explanation underneath — what it does, how it works, whether your data leaves the browser, and which tool you probably want next.
Image tools compress, resize and convert pictures using your browser’s own encoder. Text tools count, clean, compare and reformat writing. Developer tools cover the daily basics: JSON, Base64, URLs, UUIDs, JWTs, timestamps, regex and hashes. Calculators show their formula so you can check the working, and games give you somewhere to put the five minutes you just saved.