Upload up to 20 files and get one PDF back. Drag the list to reorder, or tick Reverse to fix batches that were scanned back-to-front.
In practice: (1) Keep each file under 50 MB; the combined output has no hard size limit. (2) Mixed page sizes are kept as-is rather than forced to A4. (3) Merging is lossless — pages are not re-encoded.
Frequently asked questions
Is there a limit on the number of files?
20 files per run in the free tier, 50 MB each.
Can I merge PDFs with different page sizes?
Yes. Each page keeps its own dimensions, which is usually what you want for mixed scans and printouts.
Do it in the full tool
Open Merge PDF for all options, or jump straight to another step below.