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MendPDF
Your file never leaves your device

Edit PDF without uploading

Most online PDF editors require you to upload your file to their server. MendPDF does not. The editing engine runs locally in your browser, so your document stays on your device from open to save.

What happens in a typical online PDF editor

When you use a standard online PDF editor, your file is uploaded to a remote server. The server processes it, you make your changes through a web interface, and the result is sent back to you. During this process, your document passes through third-party infrastructure. Even if the service deletes the file afterward, your data was transmitted and temporarily stored somewhere you cannot verify.

What happens in MendPDF

File loads into browser memory: When you drop a PDF into MendPDF, it loads directly into your browser's RAM. No network request is made.
WASM engine processes locally: A compiled WebAssembly engine based on PDFium runs inside your browser tab. It reads, modifies, and saves the PDF without server communication.
Output saved to your device: The edited PDF is generated in browser memory and downloaded directly to your device.
No trace after closing: Close the browser tab and the file data is discarded from memory. Nothing is retained on any server.

When not uploading matters

You are editing a contract with confidential terms.
The PDF contains personal identification numbers or financial data.
Your organization restricts uploading documents to external services.
You are working on a privileged legal document.
You simply prefer not to share your files with a third party.

Full editing capabilities without compromise

No-upload editing does not mean limited features. MendPDF supports in-place text editing, bold and font controls, color matching, RTL support for Arabic and Hebrew, freehand drawing, shapes, images, and annotations. The WASM engine patches the PDF content stream directly, preserving the original document structure.

Relevant tools

Edit PDF
Open the local editor
PDF to Word
Convert without uploading
Protect PDF
Add password locally

Edit your PDF. Keep your file.

No upload. No server. Open the editor and start working.

Open editorHow privacy works