Your Files Stay on Your Device — Always
Every other online converter asks you to upload your file to their server. We don't. Here's what that means for you.
How We Compare
| LocalConvert | cloudconvert | freeconvert | |
|---|---|---|---|
| File uploaded to server? | ❌ Never | ✅ Yes | ✅ Yes |
| Account required? | ❌ Never | ⚠️ At limit | ⚠️ At limit |
| Daily limits? | ❌ None | 10 files/day | 10 files/day |
| Works offline? | ✅ Yes | ❌ No | ❌ No |
| File retention | 0 seconds | 24 hours | 24 hours |
| Can we see your files? | ❌ Impossible | ✅ Technically | ✅ Technically |
How It Works Technically
When you drop a file into our converter, this is what happens — entirely on your device:
- 1Your browser reads the file from your local storage using the File API.
- 2The image is decoded using the browser's built-in image engine (the same engine that renders images on every website you visit).
- 3The decoded image is drawn onto an HTML Canvas element in memory.
- 4The Canvas exports the image in the target format (JPEG/PNG/WebP) using your device's CPU.
- 5The resulting file is made available for download as a local object URL — never sent anywhere.
For HEIC files, we use an open-source WebAssembly-compiled decoder (libheif). The library is downloaded once (~1.5MB), then runs entirely in your browser with no server involvement.
Verify It Yourself
Don't take our word for it. You can prove there's no upload in 30 seconds:
- 1.Open any of our converter pages
- 2.Press F12 to open Developer Tools
- 3.Go to the Network tab and check Preserve log
- 4.Drop a file and run the conversion
- 5.You'll see zero outgoing requests during the conversion
Our Privacy Guarantee
"All conversions happen locally in your browser using the browser's built-in image APIs and WebAssembly. Your files are never uploaded to our servers. We do not have servers that process files. We cannot see, store, or share any file you convert — by design, not by promise."