How Local Processing Works

Q: Can ConvertUnlimited see my files?

For supported local-processing flows, ConvertUnlimited does not provide a server-side upload endpoint for selected file contents. The public site may still load ads and analytics.

Q: Which version should I use for sensitive documents?

Use the privacy build for privacy-sensitive workflows. It is designed without ads, analytics, remote fonts, or third-party runtime scripts.

ConvertUnlimited is built around browser-native processing. Supported file tools process selected file contents locally in your browser using your own device's hardware.

Translation status

This guide is currently shown in English for this locale. Tool links still point to localized routes where available.

What is Local Processing?

Many online converters are upload services: files are sent to a remote server, processed there, and sent back. Local processing avoids that round trip for supported flows. Selected file contents are handled in browser memory by client-side scripts.

The Browser APIs Behind the Scenes

We leverage modern web standards to provide desktop-class utility performance in a website: - **HTML5 Canvas API:** We redraw and re-encode images locally to change their formats. - **File & Blob APIs:** We handle your files as local data streams without triggering a network request. - **WebAssembly (WASM):** For heavy tasks like AVIF encoding or PDF manipulation, we run high-performance compiled code directly in your browser tab.

Comparison: Local vs. Upload

Feature	Upload-Based Sites	ConvertUnlimited
Privacy	Higher exposure risk because files are uploaded	File contents are processed locally in your browser
Security	Server breach risk	No server-side upload endpoint for supported local flows
Wait Time	Upload + Download time	Instant local processing
Data Usage	Upload + download	Static page load, then local processing for supported flows
Internet	Required for processing	Not required after load

Technical Advantages

Because supported flows process selected file contents locally in your browser, the speed of ConvertUnlimited is only limited by your computer's CPU and RAM. This is why we can support bulk processing of hundreds of files without a subscription fee—we don't have to pay for massive server bandwidth, and neither do you.

What this page does

Privacy behavior

Selected file contents are processed locally in your browser for supported workflows. This privacy build does not intentionally load ads, analytics, remote fonts, or third-party runtime scripts.

Supported workflow

Use this page to understand the workflow, then open the linked tool page when you are ready to process files.