Merge PDF
Need to send a contract, its appendices and a scanned ID as one file? Drop your PDFs and photos here, put them in order and get a single document. You can drop a page you don’t need and rotate a sideways scan. It all happens in your browser — your files are never uploaded.
Files are processed right in your browser and never uploaded to a server. Open-source libraries
TL;DR. Add 2 to 50 PDF, JPG or PNG files, drag them into order and click “Merge PDF”. Each image becomes its own page. The merge runs in your browser, with no sign-up and no watermark.
How to merge PDF files into one
Add your files
Drop PDFs and images into the box or click “Choose files”. Up to 50 files, 200 MB each. You can add more at any time.
Set the order
Drag the cards or use the ↑ and ↓ arrows. The number on the left shows where each file will land in the final PDF.
Fix individual pages
Click “Pages” on a file to see thumbnails. ↻ rotates a page by 90°, × removes it from the result and ↺ brings it back.
Download the result
Click “Merge PDF”. A few seconds later a “Download” button appears with your combined file.
Your files never leave your device
A typical online PDF merger first uploads your files to its server and only then combines them. If they are contracts, bank statements or ID scans, a copy now sits with a third party for as long as it decides to keep it. There is no server in this chain. The merge is done by the open-source pdf-lib library running inside your browser tab, and the finished file is saved straight to your device.
You can check this yourself. Press F12 (Cmd+Option+I on a Mac), open the Network tab and run a merge. You will only see the tool’s own files loading from our domain — no request carries the contents of your documents.
Combine PDFs and images in one document
Besides PDFs you can add JPG and PNG images — a photo of an ID, a receipt or a signed page you snapped on your phone. Each image becomes its own US Letter page with a small margin. Wide shots are laid out in landscape, tall ones stay portrait, and the phone’s EXIF rotation is applied automatically.
PDF pages are copied as they are: text stays selectable text, images are not recompressed and quality does not drop. That is why the merged file weighs about as much as the originals combined. Shrinking it for email is a separate job — compression.
What is kept when you merge PDFs
- Text, fonts and vector graphics — no rasterizing, no quality loss.
- The size and orientation of every page: A4, Letter and custom sizes can be mixed.
- External web links on the pages.
- The rotations you set in the preview.
- Bookmarks and outlines from the source files are not carried over.
- Fillable form fields may stop being editable — fill in forms before merging.
Protected PDFs and large files
If a PDF is protected with a password or editing restrictions, the tool tells you so and won’t take the file. We don’t remove passwords: open the document where you know the password, save an unprotected copy and add that instead. Phones have less memory than computers, so when the files add up to more than 300 MB the tool warns you that merging in smaller batches is safer.
Merging in the browser vs on a server
| Feature | LiMP, in your browser | Typical upload-based service |
|---|---|---|
| Where files are processed | On your device | On the service’s server |
| Copy of your documents with a third party | No | Yes, for the retention period |
| Waiting for upload and download | No, just the merge | Depends on your connection |
| Files per merge | Up to 50 | Often 2–20 on the free plan |
| Watermark or sign-up | No | Common on free plans |
Merge PDF: frequently asked questions
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