100% LOCAL IN YOUR BROWSER • NO FILE UPLOADS • PRIVATE

Merge PDF Online

Quickly and securely combine multiple PDF files into a single document right in your browser. Your files are processed in your device’s memory with the pdf-lib library and are never sent to a server.

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Drag and drop PDF files here or click to browse

Select 2 or more files to merge. Any standard PDF document works; size is limited only by your device’s memory.

File queue: Files: 0 Pages: 0 Size: 0 KB
📋 The file list is empty. Add at least 2 PDF files to merge.
.pdf

How PDF merging works without a server

Most traditional online converters upload your files to their servers, process them with tools like Ghostscript or ImageMagick and send the result back. That creates a risk of leaking confidential information (ID documents, contracts, financial reports).

Our tool works on a completely different architecture:

🛡️ 100% local, in RAM

The pdf-lib binary parser runs entirely in your browser’s JavaScript engine (V8, SpiderMonkey, WebKit). Not a single byte of your files is sent over the network.

⚡ Instant merging

Pages (page objects, XRef tables and fonts) are copied at the speed of your device’s memory, with no waiting for uploads or downloads.

📑 Original quality preserved

Vector fonts and embedded images are copied without recompression, so text stays as sharp as in the originals.

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