Security Architecture & Zero-Upload Proof
How MediaConvertKit guarantees 100% data confidentiality and zero cloud exposure.
The Problem with Traditional Converters
When you use traditional online file converters (such as CloudConvert, FreeConvert, or Zamzar), your confidential files are transmitted across the internet to their remote servers, stored on disk, queued for processing, and made available for download. This creates substantial risk for confidential legal documents, medical files, personal photos, and proprietary corporate media.
Our Architectural Model: Edge-in-Browser
MediaConvertKit takes a fundamentally different engineering approach: instead of sending your files to the code, we send the code to your browser.
WebAssembly Sandbox
Engines run inside the browser's isolated WebAssembly sandbox with no socket or file-system access outside the tab.
RAM Memory-Only
Conversions execute entirely within volatile device memory. As soon as you close the browser tab, all buffer pointers are wiped.
Zero Server Compute
Our web servers only deliver static HTML, CSS, and WASM binaries. We operate no backend conversion queues or databases.
Full Air-Gap Capability
Once a tool page and its WASM module are loaded, you can disconnect your internet and continue converting offline.
🔍 How to Verify Our Zero-Upload Claim in 3 Clicks
You do not need to take our word for it. You can independently verify that zero bytes of your file leave your computer using your browser's built-in developer tools:
- 1Open Browser Developer Tools:
Press F12 (or Cmd + Option + I on Mac) and select the Network tab.
- 2Filter Network Traffic:
Check “Fetch/XHR” in the Network filter bar. Clear existing requests.
- 3Perform a Conversion:
Drag and drop a file and click Convert. You will observe that no POST, PUT, or upload requests containing your file data are ever initiated.
Enterprise & Compliance Suitability
Because MediaConvertKit never receives, processes, or stores your data on external servers, using our tools does not trigger data export restrictions under:
- GDPR (EU): No personal data is transferred to third-party processors.
- HIPAA (US Healthcare): Protected health information (PHI) never leaves the covered entity's device.
- FERPA & Confidential NDAs: Proprietary research and student records remain strictly local.