About ToolStash
ToolStash is a set of 44 free utilities for everyday file and text work, spread across 6 categories. The thing that makes them unusual is where the work happens: in your browser, on your own device, rather than on a server we control.
Why we built it
Search for something like "merge PDF" and you will find dozens of sites that will do it — after you upload your document to their servers. For a holiday itinerary that is fine. For a signed contract, a medical record, a bank statement or a passport scan, it is a genuinely bad idea. You are handing a private file to a company whose data-retention practices you cannot verify, usually in exchange for a five-second convenience.
Browsers have not needed that trade-off for years. Modern browser APIs — the File API, Canvas, Web Crypto, and WebAssembly — can read, edit and write files locally, fast enough for real work. ToolStash is built entirely on those APIs. The practical result is that there is no upload step, no processing queue, and no copy of your file sitting in someone else's storage bucket.
How the tools actually work
When you choose a file, your browser gives the page access to it locally. The tool reads the bytes into memory, does the work using JavaScript or WebAssembly running in the tab, and hands you back a file the browser generated on your machine. Closing the tab is enough to erase everything.
Two consequences worth knowing about. First, most tools keep working if your internet connection drops after the page has loaded, because nothing further is needed from us. Second, the practical file-size ceiling is your device's available memory rather than a limit we set — a large file on an old phone can fail where the same file on a laptop is fine.
There is one planned exception. A currency converter needs live exchange rates, which have to come from somewhere online. When that tool ships, the page will say plainly that it makes an outbound request for rate data. It still will not send us anything about you.
What we do not collect
- Your files. They are never transmitted, so there is nothing to store.
- Accounts. There is no sign-up, so there is no email list and no password to leak.
- The contents of anything you type into a tool. Text you paste into a word counter or JSON formatter stays in the tab.
Our privacy policy sets out the full detail, including what our hosting provider and advertising partners see.
How the site pays for itself
Advertising, and nothing else. There is no paid tier, no premium unlock and no usage cap we ask you to buy your way out of. Ads let the tools stay genuinely free rather than free-until-the-third-file. We aim to keep placements out of the way of the tool you came to use — no interstitials in the middle of a job, and no ad that has to be dismissed before a download works.
What is coming
Tools ship in batches rather than all at once, so each one gets built properly instead of half-working. Anything on the homepage marked "coming soon" is planned and scheduled. If you need something that is not listed, send a request — the roadmap is shaped mostly by what people ask for.