📄 Merge PDF Files Online for Free

Combine multiple PDF files into a single document. Runs entirely in your browser.

📂 Add PDF Files
📄

Drop PDF files here

or click to browse — you can add multiple files

ℹ️ How it works
  1. Select or drag & drop multiple PDF files above.
  2. Reorder files using the arrows if needed.
  3. Click Merge PDFs — processing happens in your browser.
  4. Download the merged PDF file.

What is the PDF Merger?

The PDF Merger is a free, browser-based tool that lets you combine multiple PDF documents into a single, unified file in seconds. Whether you need to consolidate invoices, merge chapters of a report, combine scanned pages, or bundle contracts into one attachment, this tool handles it all without requiring any software installation or account registration. Every operation happens entirely within your browser using the powerful PDF-lib library, which means your documents never leave your device.

Common use cases include assembling multi-part forms, combining monthly statements into a yearly archive, packaging portfolio samples, and merging presentation slides with supplementary materials. You can add as many files as needed, reorder them with the arrow buttons to set the exact page sequence, and remove any file that doesn't belong — all before generating the final merged PDF.

How to Use — Step-by-Step

  1. Click the drop zone or drag and drop your PDF files directly onto the page.
  2. Continue adding files — there is no limit to how many PDFs you can combine.
  3. Use the up and down arrow buttons next to each file to arrange them in your desired order.
  4. Click the red X button to remove any file you want to exclude from the merge.
  5. Click Merge PDFs and wait a few moments while the pages are combined in your browser.
  6. Once complete, click Download Merged PDF to save the combined file to your device.

Key Features & Benefits

🔒
100% Private

Your PDFs are processed locally in your browser. Nothing is ever uploaded to a server.

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Unlimited Files

Merge two files or twenty — there is no cap on the number of PDFs you can combine.

↕️
Custom Page Order

Reorder files with intuitive up/down arrows so pages appear exactly how you want them.

⚡
Lightning Fast

PDF-lib runs at native speed in your browser, merging most documents in under a second.

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Completely Free

No subscription, no watermarks, no sign-up required. Just open and use.

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Works on Any Device

Fully responsive design works on desktop, tablet, and mobile browsers without any app install.

Frequently Asked Questions

❓ Is the PDF Merger free to use?
Yes, the PDF Merger is completely free with no hidden fees, subscription plans, or usage limits. You can merge as many PDFs as you need, as often as you like, without ever creating an account or providing payment information.
❓ Is my data secure? Does it upload my files?
Your files are never uploaded to any server. All merging happens locally in your browser using JavaScript. Once you close the tab, nothing is retained. This makes it safe even for sensitive or confidential documents.
❓ How many PDF files can I merge at once?
There is no hard limit enforced by the tool. You can add as many files as your browser memory allows. For very large batches of big PDFs, processing may take longer depending on your device's RAM and CPU speed.
❓ Will merging PDFs affect the quality of images or text?
No. The PDF Merger copies pages from source documents directly into the new file without re-encoding or compressing them. Image quality, vector graphics, fonts, and text layers are all preserved exactly as they appear in the original files.
❓ Can I merge password-protected PDFs?
Password-protected PDFs cannot be merged directly — you will need to remove the password first using a PDF decryption tool. Once the password protection is removed, you can upload and merge the files normally.
❓ What file formats are supported?
Only PDF files (.pdf) are supported as input. The output is always a standard PDF file compatible with Adobe Acrobat, Microsoft Edge, macOS Preview, and all major PDF viewers on any operating system.