Quick Answer
A PDF merger takes two or more PDF files and joins them into a single document, in the order you choose. The tool above does this entirely in your browser: you add files, drag them into the right sequence, optionally add a blank page between documents, and download the combined PDF in seconds. Because nothing is uploaded, it is also one of the safest ways to combine files that contain personal information.
Key Takeaways
- Up to 12 files can be merged at once, each up to 60 MB.
- Drag to reorder the file list before merging — order matters, and you control it.
- Optional blank separator pages keep combined documents visually distinct.
- 100% local processing: your files never leave your computer.
What This Tool Does
You upload PDF files, and the tool stitches them into one continuous document. The content of each page — text, images, tables, links — is copied over unchanged, so the merged file looks exactly like the originals stacked together. A page that was 3 of 5 in one file simply becomes the next page after wherever the previous file ended.
Unlike many online mergers, this one never sends your files to a server. The pages are copied in memory on your own device, which makes it fast and genuinely private.
Key Features
- Multi-file upload — add up to 12 PDFs by dragging them onto the drop zone or browsing your device.
- Drag-to-reorder queue — grab any file card and slide it to its correct position before merging.
- Page previews — each file card shows a thumbnail of its first page, so you can confirm you picked the right document.
- Blank page option — tick "Insert a blank page between documents" to keep merged contracts or reports visually separated.
- Instant download — the merged file downloads straight to your device as
merged.pdf. - Clear results — see the original size, output size, total page count, and a "Process another file" reset in one click.
How to Merge PDFs
- Add your files — drag and drop PDFs onto the dashed area, or click Browse files and select them. Invalid or oversized files are rejected with a clear message.
- Check the thumbnails — each card shows the first page so you can verify you added the right documents.
- Reorder if needed — drag any card up or down the list. The final document follows this exact order.
- Set options — if you are combining separate documents, tick Insert a blank page between documents.
- Click Merge PDFs — a short progress state appears while pages are copied.
- Download — the result panel shows the output size and page count; hit Download merged.pdf to save it.
Examples
You have three PDFs: cover-letter.pdf, resume.pdf and portfolio.pdf. Add all three, drag them into that order, and merge. The result is one application packet with the cover letter first, the resume second, and the portfolio last — ready to attach to a job application email.
Or imagine you receive two halves of a scanned contract from two colleagues: contract-part-1.pdf and contract-part-2.pdf. Merging them (with the blank-page option off) restores a single, continuous contract you can sign and archive.
Use Cases
- Job applications — combine a cover letter, CV and references into one tidy attachment.
- Invoices & receipts — merge monthly PDF invoices into a single file for accounting or tax filing.
- Study notes — join lecture slides and handouts by topic so everything lives in one document.
- E-books & manuals — put multiple scanned chapters back together in reading order.
Tips
- Name your files with numbers first (e.g.
01-cover.pdf) so the list is easy to scan — or simply drag them into the order you want. - Merge files that are already compressed. Merging does not compress anything, so a 20 MB file stays 20 MB inside the combined document.
- Use the blank-page option only when merging separate documents; inside one continuous file it wastes space.
- If a file is rejected as invalid, open it in a PDF reader first — a corrupted file cannot be merged and may need re-exporting from its source app.
Privacy
Every byte of your PDFs is processed locally in your browser using pdf-lib. There is no upload, no server queue, and no retention. The privacy note under the download button is a statement of fact, not a marketing claim: your documents genuinely never leave your device.
Conclusion
Merging PDFs should take seconds, not require an account, and not involve uploading sensitive documents to a stranger’s server. This tool does all three. Add your files, drag them into order, and download the combined result — free, forever, and private by design.