Search for an image converter, and you'll find dozens of options promising free and easy conversions. But they rarely tell you where your files actually go. If you handle sensitive images—like ID scans, signed contracts, or unreleased designs—you must look closely at how the tool processes your data.
Server-Upload vs. Browser-Based Processing
Online converters split into two categories. Server-upload tools send your files to a remote server, convert them, and send them back. Browser-based (client-side) tools convert files directly in your browser without letting them leave your device.
On the surface, both methods feel identical: you upload a file and get a result. However, server-upload tools store your original file on external disks, even if only temporarily. You cannot verify when they delete it, what remains in their logs, or which employees have access.
Don't Let Convenience Blind You
Behind 'one-click' convenience, platforms often hide extensive data collection. Before trusting any image converter, verify the following details:
- A clear privacy policy that explicitly details file handling.
- Clear disclosure of storage locations and deletion timelines.
- Explicit statements indicating local or browser-only processing.
- No hidden catches, such as watermarks or forced accounts used to harvest your data.
- A secure HTTPS connection (look for the padlock icon in the address bar).
Why Client-Side is Safer for Sensitive Data
Even with deletion promises, you lose control the moment a file hits a remote server. Interceptions in transit, server breaches, and misconfigured logs present risks beyond your control. The most effective protection is simple: never send your files to a server.
Browser-based tools run conversions directly on your device. Since your files never cross the network, they cannot leak. This local approach provides absolute security for sensitive documents like IDs, medical records, or unreleased product designs.
Test It Yourself
If you aren't sure how a site processes files, run a quick test: disconnect from the internet mid-conversion. If the tool still works offline, it processes files locally in your browser. If it freezes or throws an error, it is sending your data to a remote server.
We built Switching to be entirely browser-based. Whether you convert a JPG to PNG or compress an image, the file never leaves your device. We process everything locally in your browser and never upload your files to a server, keeping your sensitive images completely secure.