# Merge PDF

> Combine several PDF files into one document, in your browser and without uploading.

To merge PDF files, add two or more documents and they are combined into a single PDF in the order you choose. The merge happens entirely in your browser using pdf-lib, so confidential documents are never uploaded and there is no page or size limit.

**URL:** https://convertto.tech/t/merge-pdf
**Category:** PDF Tools (https://convertto.tech/c/pdf-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Files per merge:** Unlimited — bounded only by memory
- **Quality:** Lossless — pages are copied, not re-rendered
- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Select your pdf files — the file stays on your device and is never uploaded.
2. Choose the order.
3. Enter or paste your page plan.
4. Press Run, then download the result when it is ready.

## FAQ

### Does merging reduce quality?

No. Pages are copied at the object level, so text stays selectable and images keep their original resolution. Nothing is re-rendered or re-compressed.

### Can I merge password-protected PDFs?

Only files with an owner password (permissions restrictions). A file with a user password cannot be opened without that password, and this tool deliberately does not attempt to break encryption.

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