Merge PDF files
Combine PDFs and arrange single pages — right here in your browser. Your files stay on your device.
- Processed locally in your browser
- No file uploads
- No sign-up
How does that work?
How your files are handled
When you add a PDF, it is read into your browser’s memory on this device and processed there by the page itself. The merged file is assembled in the same memory and saved through a normal browser download. Nothing is sent to a server — after the page has loaded, this site makes no network requests involving your documents, their names, or anything derived from them.
Closing or reloading the page discards everything. The practical size limit is your device’s memory and processor, not a server quota. This is a technical description of how the tool works, not a blanket security guarantee — your device and browser remain your own responsibility.
Drop PDF files here
or use the button — you can select several files at once
Add at least two PDF files to merge them.
How to merge PDF files
Add your PDFs
Choose files with the button or drag and drop them onto the page. You can add more at any time.
Put them in order
Reorder whole files, or open a file and pick, rearrange or remove single pages before merging.
Merge and download
One click creates the combined PDF on your device. Rename it if you like, then download.
Privacy: what happens on your device
This tool runs entirely in your browser. PDFs you add are held in this page’s memory, inspected and merged there, and offered back to you as a normal download. They are not uploaded, logged, fingerprinted or shared — the page has no server to send them to.
Heavy work runs in a background thread so the page stays responsive; that is an engineering choice, not a security barrier. If a document is confidential, the honest summary is: it never leaves this device, and closing the tab removes it from memory.
What is kept when merging
Pages are copied as they are — text, fonts, images and vector content are not re-compressed or rasterized, and page sizes and rotation are preserved. Some document-wide extras cannot be carried over by page copying:
- Interactive form fields keep their appearance but stop being fillable.
- Bookmarks, file attachments and layer switches are not carried into the result.
- Digital signatures become invalid, because merging changes the signed bytes. The tool warns you before this happens.
- Password-protected PDFs can be merged after you enter the password; the merged file itself is saved without encryption.
Honest limits
There is no account, quota or server limit. The real limits are your device’s memory and CPU: hundreds of pages are usually fine on a modern laptop, very large scanned files may be slow on an older phone.
The tool warns you before unusually large jobs instead of failing halfway. If your browser cannot finish a job, nothing is lost except time — your files are still on your device, untouched.
Frequently asked questions
Are my PDF files uploaded to a server?
No. The files are opened and merged by code running in your browser on this device. After the page itself has loaded, no network request carries your documents, their names, or data derived from them. You can verify this in your browser’s developer tools under “Network”.
Is there a file size or page limit?
No fixed one. The practical limit is your device’s memory. The tool shows a warning before very large jobs (roughly a quarter gigabyte or a thousand pages) so you can decide — these are estimates, not guarantees.
Will merging reduce the quality of my PDFs?
No. Pages are copied, not re-rendered: images are not recompressed, text stays text, and page dimensions and rotation are preserved.
Can I merge only some pages of a file?
Yes. Open a file’s pages, then select, reorder or remove individual pages — including moving pages between documents. The merged PDF contains exactly the pages you see, in the order you see them.
Can I merge password-protected PDFs?
Yes, if you know the password. It is used once, on your device, to open the file, and is not stored. The merged output is saved without password protection, and the tool tells you so beforehand.
What happens to digitally signed PDFs?
A digital signature certifies the exact original bytes, so any merge makes it invalid. The tool detects signatures and warns you before merging; the visible content is kept.
Does this work offline?
Once the page is fully loaded, merging itself needs no connection. The site does not currently promise full offline installation, so keep the tab open if your connection is unstable.
Why is this free — where is the catch?
Because your files are processed on your device, running this site costs very little. This version shows no ads and uses no analytics; if that ever changes, it will never involve reading your documents.