Merge PDF files into one
Merge PDF files online for free. Drag, drop, sort, and combine an unlimited number of PDFs into a single document. Lossless quality, instant download, and files are auto-deleted within an hour.
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Merging PDF files is one of the most common document tasks in any modern workflow — combining a contract with its addenda before sending it to a client, stitching scanned receipts onto an expense report, or assembling a complete brief from a folder of exhibits. PDFOnly's online PDF merger handles all of it in seconds, right in your browser. No installation, no watermarks, no quality loss. Drop in as many PDFs as you need, drag the cards into the order you want, and download a single combined document with text, fonts, and images preserved exactly as they were.
How to merge pdf step by step
- 1
Drop your PDFs into the upload area
Click the dropzone or drag PDF files directly from your file manager. Each file uploads in parallel — there's no need to wait for one to finish before adding the next. Files transfer over an encrypted HTTPS connection.
- 2
Reorder by dragging the file cards
Once a file finishes uploading, its card appears in the list. Grab the drag handle on the left of any card to move it up or down. The order in the list is the order they'll appear in the final merged PDF.
- 3
Add or remove files anytime
You can keep adding more PDFs after the first batch — drop them on the page or click the upload area again. To remove a file, click the X on its card. Nothing is committed until you click Merge.
- 4
Click Merge PDF and download
When you're happy with the order, click the Merge button. The combined PDF is ready in seconds for typical files. The download link is signed and expires in one hour. After that, the file is permanently deleted from our servers.
Why merge pdf on PDFOnly
Faster than desktop merges
Most desktop tools open the entire PDF before stitching, which can stall on large files. We do a streaming concatenation in milliseconds.
True lossless merging
We don't re-render or re-compress your pages. Text stays selectable, fonts stay embedded, images stay sharp. The combined PDF is byte-for-byte equivalent to opening each file and pasting its pages.
Privacy by default
Files never leave a single isolated worker process. They're auto-deleted within an hour of upload and never used to train AI models or analyze for marketing.
Honest free tier
Free users get the same merger as paying users — same speed, same quality, no watermarks. Pro adds higher limits and unlimited storage retention if you need them.
What people use merge pdf for
A few common scenarios. If your workflow looks like one of these, this tool is a good fit.
Combine signed contracts with their amendments
Send a single, ordered PDF to your client instead of three separate attachments. Faster to read, easier to file, and lower chance the recipient misses a page.
Assemble a complete job application
Merge your résumé, cover letter, portfolio samples, and reference letters into one tidy PDF. Many ATS systems prefer a single attachment over multiple files.
Stitch scanned receipts into one expense report
Combine 30 mobile-scanned receipts into a single PDF you can attach to your monthly expense submission. Reorder them by date so the report reads chronologically.
Assemble exhibits for a court filing
Merge a motion with its labelled exhibits and certificate of service into one PDF for e-filing. PDFOnly preserves bookmarks and the original layout, so your numbering stays intact.
Compile multi-chapter manuscripts
Authors and academics often work in chapter-per-file PDFs. Merge them into a complete book or thesis before printing or sending to a reviewer.
What you get
- Merge an unlimited number of PDF files in one go (Pro)
- Drag-and-drop reordering before you merge — set the sequence exactly right
- Lossless combination — text remains selectable, fonts stay embedded, images aren't recompressed
- Files auto-delete within an hour and are never used to train AI models
- Works in any modern browser on Windows, macOS, Linux, iOS, and Android
- Free for the basics: up to 10 files at 100 MB each per merge
- Encrypted uploads (TLS 1.3) and isolated processing workers
Frequently asked questions
Is there a limit to how many PDFs I can merge?
Free users can merge up to 10 files in a single batch, with each file up to 100 MB. Pro removes the file-count limit and raises the per-file size to 200 MB. Team and Enterprise plans support 1 GB+ files and unlimited batches.
Will merging change my PDF quality?
No. PDFOnly performs a lossless page concatenation — your text remains selectable and searchable, fonts and metadata are preserved, and embedded images are copied exactly without re-encoding. The merged file is bit-for-bit equivalent in content quality to the originals.
Are my files private and secure?
Yes. Files upload over HTTPS (TLS 1.3), are stored encrypted at rest, and processed in isolated worker containers that have no internet access. Files are auto-deleted within one hour. We never train AI models on customer documents and never share files with third parties.
Can I merge password-protected PDFs?
Not directly — encrypted PDFs need their password removed first. Use our Unlock PDF tool with the original password, then merge the resulting unlocked files. We never crack unknown passwords.
Can I rearrange pages within a PDF, not just between files?
Yes — but use our Organize PDF tool for that. It renders thumbnails of every page and lets you drag, delete, or rotate individual pages. Merge PDF only changes the file-level order; Organize PDF works at the page level.
Why is my merged file larger than the originals combined?
PDFs include shared resources like fonts, color profiles, and image dictionaries. When we merge files, those resources from each source PDF are bundled into the output, which can make the total slightly larger. Run the result through our Compress PDF tool to get it back down — typically 40-80% smaller.
Do I need to sign up to merge PDFs?
No. The merger works fully anonymously for files up to 100 MB. Sign up only if you want to save processed files for longer than an hour, raise file-size limits, or use the API.
Ready to merge pdf?
Free to use for the basics. Files are auto-deleted within an hour and never used to train AI.
Open Merge PDF