About OnDeviceFiles

OnDeviceFiles is a collection of free file tools built on one simple principle: a privacy tool should not require you to trust it.

Why local processing matters

Most online file tools work by asking you to upload your files to their servers, where the processing happens before the result is sent back. That means your contracts, receipts, photos and personal documents pass through someone else's computer.

OnDeviceFiles takes the opposite approach. Using WebAssembly, all processing happens inside your browser tab, on your own hardware. Your files never leave your device — which is why:

• It works even when you are offline;
• There are no queues, daily limits or accounts;
• There are no watermarks, and processing is limited only by your device's hardware.

What you get today

38 tools across images, PDFs, and video: lossless PNG optimization (OxiPNG), JPG compression, JPG/PNG/WebP to JPEG XL and JPEG XL back to JPG/PNG/WebP, JPG/PNG/WebP to AVIF encoding, AVIF/HEIC decoding to JPG/PNG/WebP/JPEG XL, AVIF to WebP, HEIC to JPEG XL, general image resizing, video-to-GIF conversion (MP4/WebM to GIF), plus PDF merging, splitting, page-to-image rendering (JPG and PNG) and image-to-PDF assembly. More are added regularly.

Guides, not just buttons

Beyond the tools we write in-depth, honest guides about the formats themselves and the privacy model behind them — how they work, which browsers really support them, why no-upload processing is safer and when conversion is worth it. Start with why “no upload” is structurally safer or our JPEG XL guide; more appear in the "Read in depth" row at the bottom of every page.

How it is funded

The site costs almost nothing to run because your device does the computing. Optional anonymous analytics help understand which tools matter. If sustainable monetization is ever added (such as unobtrusive ads), it will be disclosed on this page — never at the cost of the local-processing guarantee.