How It Works

A technical look at how CovertConvert processes your images without uploading them anywhere.

The Traditional Way (What We Don't Do)

Most image converters work like this:

1. You upload your file to their server
2. Their server converts it
3. You download the result

This means your files pass through someone else's computers. Even if they promise to delete them, you have no way to verify that.

Our Approach: Everything Stays Local

CovertConvert works differently:

1. You select files (they stay on your device)
2. Your browser reads and converts them locally
3. Converted files download directly from your browser

No upload. No server processing. No trust required.

The Technology Behind It

WebAssembly (WASM)

WebAssembly lets us run high-performance code directly in your browser. We use it for formats like HEIC and AVIF that browsers can't natively decode. The conversion libraries (libheif for HEIC, Squoosh codecs for AVIF) run entirely client-side.

Canvas API

For encoding output (JPEG, PNG), we use the browser's built-in Canvas API. This is standard web technology that's been available for over a decade.

Blob URLs

Converted files are created as Blob objects in memory and downloaded via temporary URLs. These exist only in your browser session and are cleaned up automatically.

Verify It Yourself

You don't have to trust us. Here's how to verify:

1. Open Developer Tools (F12 or right-click → Inspect)
2. Go to the Network tab
3. Convert a file
4. Watch the network requests

You'll see requests for the page assets (HTML, CSS, JS, WASM codecs), but no outgoing requests containing your file data. The conversion happens entirely in your browser.