Nothing here is uploaded
Most compression websites work by sending your file to their servers, processing it there, and sending it back. That is why they cap file sizes, add watermarks, insist on an account, or limit you to two files a day — every file you send them costs them money in storage and bandwidth.
These tools work the opposite way round. When you open a page, the compression software downloads into your browser and then runs on your own processor. Your file is read from your disk, worked on in memory, and handed back to you. It is never transmitted anywhere.
That has three consequences worth knowing. There is no size limit, because we are not paying to store anything. There is no privacy risk, because nothing leaves your device — which matters when the file is a passport scan, a medical record or an unreleased piece of work. And it is slower than a server would be, because your laptop is doing a job a data centre would normally handle.
Which tool do I need?
| Your problem | Use |
|---|---|
| Photo too large for an application form | Image |
| Scanned document rejected by a portal | |
| Presentation too big to email | Documents |
| Video will not attach to a message | Video |
| Voice recording or interview too large | Audio |
| Too many files to attach at once | ZIP |
Why files keep getting too big
Cameras and screens have improved every year for a decade. Upload limits have barely moved. Gmail has capped attachments at 25MB since 2009, while the phone in your pocket now produces a 350MB video from one minute of recording. The gap between what devices create and what services accept widens every year, and compression is how you cross it.
Questions
Is this really free?
Yes. The site is supported by advertising, not by subscriptions or upsells. There is no premium tier and no feature held back.
Do I need to install anything?
No. It runs in any modern browser on any device. There is nothing to download and no extension to add.
Does it work offline?
Once a tool page has finished loading, yes. You can disconnect and it will keep working, which is a useful way to satisfy yourself that nothing is being uploaded.