Merge PDF Files Online — Free and Private
Combine multiple PDF files into one document (Client-side processing)
Drop PDF files here
or click to browse (Multiple PDFs supported)
How It Works
Upload Your PDFs
Click or drag your PDF files to merge them
Set the Order
Use arrows to arrange PDFs in the desired order
Download Merged PDF
Get your merged PDF instantly with one click
Help & Tips
- Reorder: Drag files to set merge order before combining.
- Local: Merging is client‑side—files stay on your device.
- Naming: Use clear filenames to track post‑merge content.
- Size: Avoid merging extremely large files to keep outputs manageable.
- Support: Questions? Contact us.
Frequently Asked Questions
Is the PDF merge tool completely free?
Yes. PDFLY's Merge PDF tool is 100% free with no sign-up, no watermarks and no file limits.
Are my PDF files private when I merge them?
Yes. Merging is done entirely in your browser using JavaScript. Your files never leave your device and are never uploaded to our servers.
How many PDF files can I merge at once?
You can merge as many PDF files as your browser can handle. There is no strict limit imposed by PDFLY.
Can I reorder pages before merging?
Yes. Use the up and down arrows next to each file to set the merge order before combining them.
Will merging PDFs reduce their quality?
No. PDFLY merges PDFs without re-encoding or compressing them so the output quality is identical to the originals.
Why Use PDFLY to Merge PDFs?
PDFLY's merge tool offers several advantages over other PDF mergers:
- 100% Client-Side Processing: Your files are merged entirely in your browser using JavaScript. Unlike iLovePDF or Smallpdf, your PDFs never leave your device and are never uploaded to our servers.
- No File Size Limits: Many free PDF tools limit files to 100MB or less. PDFLY has no strict limits — merge as many files as your browser can handle.
- No Watermarks on Free Tier: Some competitors add watermarks to merged PDFs unless you pay. PDFLY is 100% free forever with zero watermarks.
- Works on Mobile: Merge PDFs directly on your phone or tablet — no desktop required.
- Drag-and-Drop Reordering: Easily set the merge order with intuitive drag controls before combining files.
Supported Formats & Limitations
| Feature | Details |
|---|---|
| Supported Input Format | PDF only |
| Maximum File Size | No strict limit (browser-dependent) |
| Number of Files | Unlimited (browser memory permitting) |
| Processing Method | Client-side (browser JavaScript) |
| Browser Compatibility | Chrome, Firefox, Safari, Edge (requires JavaScript enabled) |
Very large PDFs (500+ pages each) may take longer to merge depending on your device's processing power.
Common Use Cases for Merging PDFs
People use PDFLY's merge tool for many purposes:
- Students: Combine lecture notes, assignments, and study materials into one PDF for easier organization and sharing.
- Lawyers and Legal Professionals: Merge contracts, exhibits, and supporting documents into a single case file.
- Job Applicants: Combine resume, cover letter, and portfolio samples into one PDF to submit as a job application.
- Designers and Creatives: Merge mockups, proposals, and reference materials into a single client presentation.
- Business Professionals: Combine reports, spreadsheets, and charts into one comprehensive quarterly review document.