Your files never leave this page.

FileUp24 is intentionally built without an upload endpoint, database, cloud conversion service, account system, or external file API.

What runs on-device

PDF merge, split, and signing use pdf-lib inside a real Web Worker. PDF rendering uses pdf.js. Images use the browser Canvas encoders. HEIC conversion lazy-loads heic2any/WASM as code, then decodes the selected image locally.

30-second verification

Open F12 → Network → run a tool → watch the requests. You should not see POST or PUT requests carrying your file bytes. The strongest test is: load the tool, enable airplane mode, then process a file that is already on your device.

Honest limits

Browsers have memory ceilings, especially for large PDFs and rasterized pages. Password-protected PDFs are not unlocked. The signature feature is a drawn image stamp and not a cryptographic digital signature. The first tool load may download JavaScript/WASM library code; that is code, not your selected files.