PDF Merger
Combine multiple PDF files into one. Reorder files before merging, then download the result — no upload, no sign-up, no file size limit.
Files never leave your device.Your files never leave your device. All processing happens in your browser.
How to Merge PDFs
- Add your PDFs. Click Drop PDF files here or drag them onto the upload area. You can add several files at once, or keep adding them in batches.
- Reorder if needed. Each file appears as a numbered row with its name and page count. Use the ▲ and ▼ arrows to change the order — the final document follows this sequence top to bottom.
- Merge. Click the Merge button (you need at least two files). The browser combines all pages in order; large files may take a few seconds.
- Download. Click Download merged PDF to save the result.
Common Use Cases
- Combining scanned documents. A multi-page form scanned one page at a time becomes a single coherent file.
- Assembling a report or portfolio. A cover page, a body, and an appendix merged into one document before sending.
- Joining monthly statements. Bank or card statements across several months combined for an accountant or tax preparer.
- Packing a job application. Résumé, cover letter, and references combined into the one PDF an employer asked for.
What Is Kept When You Merge
Merging copies each page into a fresh document. Here is what survives that copy and what to watch for:
| Element | Result |
|---|---|
| Page content (text, vector, images) | ✓ Copied exactly |
| Selectable text & embedded fonts | ✓ Kept |
| Links & page annotations | ✓ Usually kept |
| Page size & orientation | ✓ Each page keeps its own |
| Bookmarks / outline sidebar | ✗ Not carried over |
| Interactive form fields | △ May break on duplicate field names |
Tip: if a source PDF is a fillable form, flatten it before merging so its fields do not collide with another file that uses the same field names.
Frequently Asked Questions
How many PDFs can I merge at once?
There is no fixed limit — the tool processes everything in your browser memory. In practice, merging 20-30 typical office documents works smoothly. The real limit is total size, not file count: several hundred megabytes combined may be slow on a low-memory phone or laptop.
Does the order of the PDFs matter?
Yes. Pages appear in the order the files are listed. Use the up and down arrows to reorder before clicking Merge — the first file in the list becomes the first section of the merged document.
Will the merged PDF look exactly like the originals?
Yes for the page content. Text stays selectable, and images, vector graphics, and embedded fonts are copied exactly with no re-rendering or quality loss. Each page also keeps its own size and orientation, so mixing A4 and Letter pages is fine — they are not stretched to match.
Are bookmarks and form fields kept when merging?
Page content and most page-level annotations (such as links) carry over, but two things have limits. The document outline or bookmarks sidebar is generally not preserved when pages are copied into a new file, and interactive form fields can stop working if two source PDFs use the same field name. If you need working forms, flatten them in a PDF reader before merging.
Can I merge password-protected PDFs?
The tool can open PDFs that are owner-locked but not user-locked (no password needed to view). A PDF that asks for a password before it will open cannot be merged — unlock it first in a dedicated PDF reader, then merge the unlocked copy.
Are my files uploaded to a server?
No. All merging happens in your browser using the pdf-lib JavaScript library — nothing is sent anywhere. You can confirm it in your browser network panel, and the tool keeps working offline once the page has loaded.