About Merge PDF
Merging PDFs is routine paperwork: a signed contract plus its annex, a stack of receipts for an expense claim, chapters exported from different tools that belong in one file. The files usually arrive separately and the person receiving them wants a single document with a predictable order, often for an upload form that accepts one attachment only.
This merger copies pages from each PDF into a new document with pdf-lib, so text stays selectable and nothing is re-rendered or re-compressed. It shows the page count of every file and the total before you merge, keeps the list order you arrange, and lets you preview the result. Everything runs locally — the documents never leave the browser — and password-protected files are reported by name instead of failing silently.
What this tool does
Merge up to 20 PDFs
Combine a full set of contracts, receipts or chapters in one run, with a clear total of documents, pages and file size.
Reorder with buttons or keyboard
Move any file up or down the list before merging, so page order is decided deliberately rather than by upload order.
Pages copied, not re-rendered
Page content is copied into the merged document, so selectable text, vector graphics and image quality are preserved exactly.
Per-file page counts
Each file's page count is read as soon as it is added, so you can spot a wrong file before merging.
Named password errors
If a PDF is encrypted, the tool tells you which file needs to be unlocked instead of ending with a vague failure.
Preview before download
The merged PDF is shown in an inline preview so you can check the first pages and page order before saving.
How to use Merge PDF
- 01
Add the first PDFs
Drop two or more PDF files onto the workspace or click Choose files. Each file's page count appears immediately.
- 02
Add the rest
Keep adding files until the document set is complete. The workspace shows the combined page count and size.
- 03
Arrange the order
Use the up and down arrow buttons beside each file to set the final page order. Files merge from top to bottom.
- 04
Merge the documents
Click Merge PDFs. A progress bar tracks each file as its pages are copied into the new document.
- 05
Download the result
Check the preview, then download the merged file. It is named merge-pdf with today's date.
Supported formats and limits
- Input
- Output
- Processing
- Client-side, in your browser. Nothing is uploaded.
- Maximum size
- Up to 20 files · about 100 MB total
- Requirements
- Chrome, Edge, Firefox or Safari · Two or more PDF files
Limitations worth knowing
- Up to 20 PDFs and about 100 MB total per merge. Larger sets must be merged in batches.
- Bookmarks, comments, form fields and digital signatures are not preserved; only page content is copied.
- Encrypted PDFs must be unlocked before they can be added to the merge.
Privacy and file handling
The PDFs are opened and combined inside your browser with pdf-lib. They are never uploaded to a server, never stored, and the merged document is created on your device. Closing the tab discards the files and the result.
Read the full privacy policy