Merge PDF
Merge and reorder multiple PDF files into one, in your browser — no file size limit and no sign-up.
FAQ
Is there a file size or count limit?
No. Merging happens entirely in your browser without a server round-trip, so there is no 5MB / 100MB cap or daily task limit like most online tools. The practical limit is your computer memory.
Does merging reduce quality?
No. Merging copies the pages of each file into a new document without re-encoding, so content and sharpness stay identical.
Are my files uploaded?
No. They stay on your device and merging works offline.
Can I merge password-protected PDFs?
Password-protected PDFs are skipped automatically and counted in the result: their content streams stay encrypted, so a forced merge produces a file that will not open. Remove the protection with the original password first.
About this tool
Joins several PDFs into one document in the order you choose: the file list reorders with the arrow buttons and removes with the cross, and multiple files can be selected at once. Everything runs in the browser, nothing is uploaded, and there is no size or daily quota.
Merging does not degrade quality, because nothing is re-encoded. Each page object is copied verbatim into the new document - images, fonts and vectors are untouched - so sharpness is identical before and after. That is a completely different operation from "screenshot or print to PDF", which does lose quality.
Encrypted PDFs are skipped rather than merged into a broken file. A PDF with an open password keeps its content streams encrypted, and copying pages from it produces a document that will not open. This tool therefore skips it and reports how many were skipped; remove the protection with the original password first.
Limits worth knowing:
- The ceiling is your RAM: there is no server-side 5MB or 100MB cap, but documents of several hundred MB or thousands of pages consume a lot of memory and may stall or crash a low-spec tab. Split very large jobs into batches.
- Bookmarks, forms and outlines are not rebuilt: page content survives intact, but the source bookmark trees, fillable form fields and internal cross-references are not carried across files, and existing links may point at the wrong page afterwards.
- Non-PDF files are ignored: when dropping a batch, only PDFs are accepted and a notice tells you how many were skipped.
The output is always saved as merged.pdf; rename it when saving if you need something else.