Merge PDF files without uploading them
Combining a signed contract, its annexes and a scanned appendix into one document is a two-minute job that most sites turn into an account signup. Drop the files here, drag them into the right order, and get one PDF back. Page sizes and orientation are preserved, so a mixed A4 and A3 set stays correct.
- Drag and drop ordering, so page order is not a guessing game
- Original page dimensions and orientation are preserved
- No limit on how many files you combine
- Runs locally, so confidential annexes stay confidential
Frequently asked questions
Does merging re-compress the pages?
No. Pages are copied across as they are, so the output keeps the quality of the inputs. If the result is large, run it through the compress tool afterwards.
Can I merge PDFs of different page sizes?
Yes. Each page keeps its own dimensions, so an A4 document followed by an A3 drawing renders correctly rather than being squashed to one size.
What about password-protected files?
An encrypted PDF has to be unlocked before it can be merged. Remove the password in your PDF reader first, then merge.
Guides and benchmarks
- OCR that looked like it worked - Five bugs in a browser OCR pipeline, every one of which produced a plausible success instead of an error. Measured before and after, with the code paths named.
- How small a PDF actually gets, from 50 KB to 1 MB - Five test files, both presets, and which size targets each one clears. Measured in the browser, with nothing uploaded at any point.
- What PDF compression actually does, measured - Every PDF site claims "up to 90% smaller" and none of them show their corpus. Here are the numbers for this one, the documents they came from, and how to reproduce them.