Key Statistics
Up to 100MB total Maximum file size
<2 seconds per 10MB Processing speed
100% client-side - zero server uploads Privacy guarantee
Merge PDF Files Online — Free, Private, No Upload
Drag and drop your PDF files below to combine them into a single document. All processing happens directly in your browser—your files never leave your device. Reorder pages by dragging, remove unwanted files, then download your merged PDF instantly. No signup required, no file size limits, no watermarks. Works completely offline.Drop PDFs here or click to browse
Supports multiple PDF files. Drag to reorder.
Your files never leave your browser. All processing happens locally.
How Does PDF Merge Compare?
We built PDF Merge to be completely free and private. Here's how we stack up against popular alternatives:
| Feature | PDF Merge Us | Adobe Acrobat | SmallPDF | iLovePDF |
|---|---|---|---|---|
| Price | Free forever | $19.99/month | $12/month | $7/month |
| Privacy | 100% local | Cloud upload | Cloud upload | Cloud upload |
| Account Required | No | Yes | Yes | Optional |
| Usage Limits | Unlimited | Unlimited | 2 files/hour (free) | 10 files/day (free) |
| Watermarks | None | None | Yes (free tier) | None |
| Works Offline | Yes | No | No | No |
What is PDF Merge?
PDF Merge is a free browser-based tool that combines multiple PDF documents into a single file. Unlike traditional PDF mergers that upload your files to remote servers, this tool processes everything locally using JavaScript and the pdf-lib library. Your documents stay on your device throughout the entire process.
Ideal for combining invoices, contracts, reports, or any documents you need in a single PDF.
How does PDF Merge work?
- 01 Drag and drop PDF files onto the upload area, or click to browse your files
- 02 Reorder files by dragging them into your preferred sequence
- 03 Remove any unwanted files by clicking the X button
- 04 Click "Merge PDFs" to combine all files into one document
- 05 Download your merged PDF instantly—no email required
Why use a browser-based tool?
- Privacy first: Files never leave your device or get uploaded to any server
- Speed: No upload/download wait times—processing is instant
- Security: No risk of data breaches or third-party access to your documents
- Offline capable: Works without internet connection after page loads
- No limits: Merge as many PDFs as you want, no daily quotas or file size caps
Common Questions
Is there a file size limit for merging PDFs?
There's no enforced file size limit. However, very large files (100MB+) may be slower to process depending on your device's memory. For best performance, we recommend keeping individual files under 50MB.
Are my PDF files uploaded to a server?
No. All processing happens entirely in your browser using JavaScript. Your files never leave your device. You can verify this by disconnecting from the internet after the page loads—the tool will still work.
Can I merge password-protected PDFs?
Currently, password-protected PDFs must be unlocked before merging. We recommend using a PDF password remover first, then merging the unlocked files.
What browsers are supported?
PDF Merge works in all modern browsers including Chrome, Firefox, Safari, and Edge. For best performance, use the latest version of your preferred browser.
Can I reorder pages from different PDFs?
Yes. After adding your PDFs, you can drag and drop to reorder entire files. For page-level reordering, use our PDF Split tool to extract specific pages, then merge them in your desired order.