Most online image converters upload your files to their servers. That's a privacy risk, especially for sensitive documents. AvifKit processes everything locally in your browser using WebAssembly. Your photos never touch the internet.
The Risk: How Traditional Online Converters Work
When you use a typical online converter, here's what happens:
- You upload your file to their server
- The server processes the conversion
- The server sends the converted file back to you
- The server might delete your original file... or might not
Even if the website claims to "delete files after 24 hours," you have no way to verify that. Your photos could be sitting on their server indefinitely. Or worse, analyzed for machine learning, scraped for metadata, or compromised in a data breach.
Real-world scenarios where this matters:
- Converting photos of your ID or passport
- Processing confidential business documents
- Handling client photos (photographers, designers)
- Converting personal family photos
- Working with medical or legal images
The AvifKit Solution: Client-Side Processing
AvifKit uses WebAssembly (WASM) technology to run the entire conversion process inside your web browser. Think of it like having a mini Photoshop running directly in Chrome or Firefox.
Here's how it works:
- You drag a file into the browser window
- The file stays on your computer - it's never uploaded
- WebAssembly code runs locally and processes the conversion
- The converted file is generated on your device
- You download the result directly from your own browser memory
At no point does your file leave your computer. We can't see it. Our servers can't access it. It's impossible for us to store or log your images because they never reach our servers in the first place.
Technical verification:
You can verify this yourself by opening your browser's Network tab (F12 → Network) and watching the requests. You'll see that when you convert a file, there's zero upload activity. Only the web page itself is loaded from our server - your images never leave your device.
What is WebAssembly (WASM)?
WebAssembly is a technology that lets web browsers run high-performance code - the kind of code normally used in desktop software. It's supported by all modern browsers (Chrome, Firefox, Safari, Edge).
Think of it like this: instead of sending your file to a server running Photoshop, we're running a lightweight version of the conversion software directly inside your browser. Same result, zero privacy risk.
Benefits for you:
- Faster: No upload/download wait times
- Private: Files never leave your computer
- Secure: No server breaches possible
- Unlimited: No file size restrictions
- Offline: Works without internet (after first page load)
Frequently Asked Questions
Can you see my files?
No. Technically impossible. Your files are processed entirely in your browser's memory. They're never transmitted to our servers, so we have no way to access them.
Do you store any metadata from my images?
No. Since we never receive your files, we can't extract or store any metadata (EXIF data, GPS coordinates, etc.).
Is WebAssembly safe?
Yes. WebAssembly runs in the same secure sandbox as regular JavaScript in your browser. It can't access your file system or network without explicit permission.
Does this work on mobile devices?
Yes. Modern mobile browsers (Chrome, Safari, Firefox) all support WebAssembly. The conversion process works the same way on phones and tablets.
What about really large files?
Since processing happens locally, the only limit is your device's available RAM. Most modern computers can handle files up to several gigabytes without issues.
Bottom Line
Trust AvifKit for sensitive documents. Client-side processing means 100% privacy - your images never leave your device, and we have no way to access them even if we wanted to.
Convert with complete privacy
Your images stay on your device. Zero upload. 100% client-side processing.
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