Merge PDF
Combine multiple PDF files into a single document
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About Merge PDF
Merge combines any number of PDFs into one file, in the order you choose. Bookmarks and internal links from each source document are carried into the merged output, and page sizes are preserved rather than normalised — an A4 document merged with a US Letter one keeps both formats.
Merging happens locally in a web worker. The files are read from disk into memory, combined, and written back out without any network request.
How to use Merge PDF
- Add two or more PDFs. Up to 100 files can be queued at once.
- Drag the file cards to set the order — the first card becomes page one of the output.
- Check the page counts shown on each card if you are merging revisions of the same document and need to be sure you picked the right one.
- Merge and download. The result is a single PDF with the pages in your chosen sequence.
On a production
A single day's paperwork is rarely a single file. Call sheet, script sides, a risk assessment and a map arrive from four different people. Merging them into one PDF means one attachment for the crew and one document to print at the unit base, rather than four things somebody will forget to open.
Frequently asked questions
- Are bookmarks and links kept?
- Bookmark trees from each source file are preserved and nested under the document they came from. Internal links that pointed to a page inside their own document are remapped to the new page numbers. Links to external URLs are unchanged.
- What happens when the documents are different page sizes?
- Each page keeps its original dimensions. The merged file will simply contain pages of mixed sizes, which every PDF reader handles. If you need one uniform size, run Fix Page Size on the result afterwards.
- Is there a file size limit?
- No fixed cap. Because the merge runs in your browser, the practical limit is available memory rather than an upload quota — several hundred megabytes is routine on a desktop machine.