Merge PDF Files
Combine multiple PDFs into one document. Drag to reorder files before merging.
How to Merge PDF Files Online
- Click the drop zone above or drag and drop two or more PDF files into it.
- Thumbnail cards appear for each file. Drag any card left or right to reorder.
- Click Merge PDFs. Your combined PDF downloads immediately.
- If the automatic download is blocked on your device, tap the green save button that appears.
Why Merge PDFs?
Merging PDFs is one of the most common document tasks in offices, schools and everyday life. You might need to combine a cover letter with a CV, join several scanned pages from a scanner, consolidate monthly reports, or send a client a single file instead of an attachment bundle. PDFForge handles all of these in seconds, with no upload and no limit on how many files you can combine.
Professional Use Cases for Merging PDFs
- CV and cover letter — Combine your cover letter PDF with your CV PDF so employers receive a single clean attachment instead of two separate files.
- Legal bundles — Solicitors and paralegals frequently compile court bundles by merging dozens of evidence pages, exhibit PDFs and correspondence into a single chronological document.
- Annual reports — Finance teams compile separate sections (executive summary, financial statements, auditor's report) into one merged PDF for regulatory submission.
- Research papers — Academics combine a manuscript PDF with separate appendix and supplementary material PDFs before submission to a journal.
- Invoices and receipts — Freelancers and small businesses combine multiple monthly invoices into a single statement PDF for clients.
Merging vs. Adding Blank Pages
If you need to merge several documents but want blank separator pages between each section — a common requirement for printed booklets and formal reports — use the Add Blank Pages tool first to append a blank page to each document that needs one, then merge everything with this tool. The resulting PDF will have clean section breaks and will print correctly on double-sided printers.
Frequently Asked Questions
How many PDF files can I merge at once?
There is no limit on the number of files. You can merge 2 files or 20 files in one go. The only practical constraint is your device's memory — very large collections of PDFs may be slow to process.
Will merging change the quality of my PDF?
No. PDFForge copies pages directly from each source PDF into the output document without re-rendering or re-compressing anything. The quality, fonts and images remain exactly as they were.
Can I merge password-protected PDFs?
PDFForge attempts to load password-protected PDFs with encryption ignored. If the PDF is strongly encrypted it may fail to load. In that case, use the Protect / Unlock tool to remove the password first, then merge.
Is it safe to merge PDFs in a browser?
Yes. All processing happens locally using PDF-Lib, an open-source JavaScript library. Your files never leave your device and are never stored anywhere.
Can I merge PDFs on a mobile phone or tablet?
Yes. PDFForge works in any modern mobile browser on iOS or Android. Tap the drop zone to open your file picker, select multiple PDFs, then tap Merge PDFs. The combined file downloads directly to your device.
What order will the pages appear in the merged PDF?
Pages appear in the order you have arranged the file cards. By default this is the order you added the files, but you can drag any card to change the sequence before merging. The first card's pages come first, followed by the second card's pages, and so on.