Invistools
Over 400 free tools for text, images, PDFs, audio, music, electronics, dates and everyday calculations — every one of them running inside your own browser. Choose a language to start; there is nothing to install and nothing to sign up for.
Your files are processed on your device and never uploaded.
What this site is
Invistools is a library of more than 400 small, single-purpose tools. Each one does exactly one job — resize an image, split a PDF, format JSON, tune a guitar, work out a resistor value, count the days between two dates — and does it on the page you open, with no installation and no setup step. The catalogue is sorted into eleven categories: text, images, PDF and documents, audio, music, electronics, time and dates, everyday utilities, validators, esoteric and games. Every tool is published in all 36 languages listed above — not just the buttons, but the instructions and descriptions with them.
How "runs in your browser" actually works
A tool page is a small program your browser downloads once and then executes on your own machine. When you pick a file, the browser hands it to that program through ordinary web APIs — FileReader for raw bytes, Canvas for images, Web Audio for sound, WebAssembly for the heavier formats — and the result is written straight back into the page you are looking at. No step in that chain involves a server: there is no upload endpoint waiting to receive your file and no queue on the other side to process it. It is also why a tool keeps working if your connection drops after the page has loaded.
Why that matters
Because nothing is transmitted, nothing can be stored, inspected or leaked later. That is not a claim about how carefully we handle your data — it is a consequence of where the code runs. You do not have to take it on faith either: open your browser's developer tools, switch to the network panel, run any tool on a real file, and watch that your document never shows up in a request.
No accounts, no quotas, no watermarks
There is no registration, no login and no paid tier holding back the real version. Nothing is metered — you can run the same tool a hundred times in a row, on files as large as your browser can hold in memory — and nothing is stamped onto the output. Because no account exists, there is no profile and no file history that could go missing. The only things the site remembers are your interface language and the tools you starred as favourites, and both stay in your browser's local storage.
Who runs Invistools
Invistools is built and maintained by Invis Matters, an independent studio that develops and runs its own products. Invistools is one of them, funded by the studio itself rather than commissioned by a client. The About page has the longer version, and the contact page carries a working address that reaches the studio directly.
How it is paid for
Hosting, domains and the hours behind each tool cost money, and advertising on the pages plus voluntary donations cover it. The tools stay free and complete either way — nothing is held back behind a payment, and your files are never part of the transaction.