Why these tools run on your device
The reasoning, the trade-offs, and how the site pays for itself.
The problem with free online file tools
Search for a way to convert a photo or shrink a video and you will find hundreds of free tools. Nearly all of them work the same way: you upload your file to a server, the server does the work, you download the result.
That model has consequences most people never think about until they hit one.
Your file leaves your computer. It travels to a machine you know nothing about, run by a company you have not heard of, potentially in a country whose data laws you have not read. For a meme, fine. For a bank statement, a passport scan, a contract under NDA, or photographs of your children, it is a genuinely poor idea — and it is exactly why corporate IT departments block these sites outright, leaving employees with a task they cannot legally complete.
It also costs the operator money. Every file you upload consumes their bandwidth, their processing time and their storage. That cost is why free tools cap your file size, limit you to a few conversions a day, add a watermark, or — most commonly — let you do all the work and then ask you to create an account before you can download the result.
A different approach
Modern browsers can run compiled software at close to native speed, using a technology called WebAssembly. Image decoders, video encoders and PDF libraries that once required a desktop application or a server can now run inside a web page.
That means the work can happen where the file already is: on your own machine. Your browser reads the file from your disk, processes it in memory, and writes the result back to your downloads folder. Nothing is transmitted, because there is nothing to transmit to.
You can verify this claim rather than trusting it. Open any tool on this site, disconnect from the internet, and use it. It works. A tool that secretly uploaded your file could not.
What that makes possible
| Typical online tool | Here | |
|---|---|---|
| Your file | Uploaded to their server | Never leaves your device |
| Account | Usually required to download | None, ever |
| File size cap | Set by their bandwidth budget | Only your device's memory |
| Daily limit | Common on free tiers | None |
| Watermark | Common on free tiers | None |
| Wait before starting | Full upload first | Starts immediately |
None of that is generosity. It is arithmetic. When processing a file costs us nothing, there is no reason to ration it, and no reason to make you register so we can eventually charge you.
Where the limits genuinely are
It would be dishonest to present this as free of trade-offs. There are three real ones, and each tool states the relevant limit on its own page rather than letting you discover it halfway through a job.
Memory. A browser tab has a ceiling on how much memory it can use. Processing a file typically needs two to three times the file's size in RAM, so very large files — over roughly a gigabyte — will fail. For those, desktop software is genuinely the right tool, and we say so.
Speed. Browsers cannot use your graphics card for video encoding, so compression runs on the processor alone and is several times slower than a native application. For most files you still come out ahead overall, because you skip the upload and the download entirely — but on a small file, a desktop program will finish first.
No memory between visits. Without accounts there is no history, no sync and no cloud storage. That is the direct cost of not asking who you are, and we think it is worth paying.
How this site pays for itself
Hosting static pages is inexpensive, but not free, and building these tools takes real time. The site is funded by advertising displayed alongside the tools.
We would rather say that plainly than pretend otherwise. The alternative funding models for a tool site are a subscription, a paid tier that cripples the free one, or harvesting user data — and all three would undermine the reason this site exists. Advertising keeps the tools genuinely free, genuinely unlimited, and genuinely private, because ads are shown against the page, never against your files.
Ads are kept out of the way of the tool itself. If one ever obstructs your work, that is a bug and we would like to hear about it.
What's next
More tools, added steadily. The rule for each one is the same: it must do a single job properly, work the moment you land on the page, run entirely on your device, and never ask you to sign up.
If there is something you keep needing and cannot find a decent version of, tell us. That is how this list grows.