Merge PDF Files
Combine two or more PDFs into one document — free, in your browser, with no upload. It even works offline after the first visit, and your files never leave your device.
- No upload Files never leave your device — every tool runs in your browser.
- Works offline Runs with no internet after the first visit.
- No size limits No fixed caps or paywalls — only your device’s memory.
- Private by design Nothing is uploaded, queued, or stored on a server.
Your PDFs are merged in your browser — nothing is uploaded.
Click to choose PDF files or drag and drop them here
Select at least two PDFs to merge
How to merge PDF files
- Click the box above (or drag your files onto it) and select two or more PDFs.
- Reorder them with the up and down arrows until the sequence is right.
- Remove anything added by mistake with the ✕ button.
- Click Merge PDF.
- Your browser downloads the combined
merged.pdfautomatically.
How it works
This tool runs entirely in your web browser. When you add files, it reads each PDF locally with the open-source pdf-lib library, copies every page in the order you chose, and writes them into one new document. Nothing is uploaded, queued on a server, or stored online — when the merge finishes, the file downloads straight to you. Because pages are copied rather than re-rendered, the result is lossless: fonts, text and images come through untouched.
Why merge PDFs here instead of a typical online tool
Most online mergers upload your documents to a remote server to do the work. That means contracts, invoices, ID scans and medical records leave your control, even briefly. This tool does the merge on your device instead, so your data stays with you. There is no account to create, no email required, no watermark stamped on the output, and no daily limit. Once the page has loaded it even works offline, and it is genuinely free — funded by advertising rather than by charging you or selling your data.
Local tools vs cloud tools
The difference is where the work happens. These tools run on your own device; most online PDF sites run on a server you have to send your file to first.
| Local (this site) | Typical cloud tools | |
|---|---|---|
| Upload required | No | Yes |
| File-size caps | None (device memory) | Common |
| Works offline | Yes, after first load | No |
| Files stay private | Yes — never leave device | Sent to a server |
All PDF tools
Every tool below is free, runs in your browser, and never uploads your files.
Guides
- How to merge PDFs without losing quality — Why true merging is lossless, and the one setting that quietly degrades files.
- Edit PDFs on iPhone, Mac & Windows — free, no upload — The same browser tools, step by step, on every device you own.
- Are online PDF tools safe? — What “processed in your browser” really means for your private documents.
Frequently asked questions
Are my files uploaded to a server?
No. The merge happens inside your web browser using JavaScript. Your PDFs never leave your device and are never sent to us or any third party.
How many PDFs can I merge at once?
As many as you like. The only practical limit is your device’s memory, because every page is assembled locally rather than on a server.
Can I reorder the files before merging?
Yes. After selecting your files, use the up and down arrows beside each one to set the order, then click Merge PDF.
Does the merged PDF lose any quality?
No. Pages are copied across exactly as they are — text stays selectable and images keep their original resolution. Merging never re-compresses your content.
Does it work on a phone?
Yes. It runs in modern mobile browsers. Pick PDFs from your files app and the merged result downloads straight to your phone.
Does merging work on slow or metered internet?
Yes. Because your PDFs are never uploaded and the merged file is never downloaded from a server, your connection speed has no effect on the merge itself. Only the small app loads the first time you visit — after that it is cached, so you can merge again on a weak or capped connection without spending data on your files.
Can I merge PDFs offline?
Yes, once the page has loaded. The site is a Progressive Web App, so after your first visit the tools are cached on your device and the merger keeps working with no internet at all.
Is there a limit on the size of PDFs I can merge?
There is no fixed cap and no paywall on large files. The only ceiling is your own device: assembling very large PDFs uses memory, so an extremely big combined document can be limited by the RAM available in your browser rather than by us.
Is it really free?
Yes. The site is free and funded by unobtrusive ads. There is no sign-up, no watermark, and no paid tier.