This PDF merge tool combines multiple PDF files into a single document in the order you specify, all processed locally in the browser — no upload to a server. At least 2 files are required; the tool supports up to 50 files, with a 100 MB limit per file.
Controlling merge order
After uploading, each file appears in the list with its name and page count. The merged output strictly follows the list order from top to bottom — the first file's first page becomes page 1 of the final document.
Reordering options:
- Move up / Move down: adjusts one file at a time
- Reverse order: flips the entire queue instantly — useful when you've uploaded files in the wrong sequence
- Remove: deletes a file from the list; files showing an error must be removed before merging can proceed
What the error state means
After upload, the tool analyzes each PDF's structure. If a file cannot be parsed, it shows an error indicator in the list. The merge button is disabled until all errored files are removed. The overview area shows a "N files · M pages total" summary — use this to confirm nothing is missing before merging.
Output file naming
The output filename is auto-generated from the first file's name and the total count: {first-filename}-merged-{count}.pdf. For example, uploading 3 files where the first is report.pdf gives report-merged-3.pdf.
Merging password-protected PDFs
If any file has a password, enter it in the "PDF Password (optional)" field. This password applies to all files in the queue — it only works when all encrypted files share the same password. Files with different passwords cannot be merged in a single run.
This tool reorders files, not pages
PDF merge combines complete files in the sequence you set. It does not extract or reorder individual pages within a single PDF. For page-level control, use the PDF split tool first to extract the pages you need, then merge the results.