Merge PDF files
Drop in the files you want joined. Drag them into the order you want.
How it works
- Drop in two or more PDFs.
- Drag them into order.
- Download the merged PDF.
What it does
Joining PDFs is the most ordinary thing anybody does to one, and it is usually the thing that sends people looking for a website. Drop the files in, drag them into the order you want, and download one document. The page content is copied across untouched — same text, same fonts, same images, same quality.
Order is the whole job
Most merges go wrong at the ordering, not the joining, so the files are shown as cards you can drag. What you see left to right is what you get top to bottom. You can add more files after you have started without losing the arrangement you have already made.
Quality is not touched
Nothing is re-encoded on the way through. Images keep their resolution, text stays as text rather than being flattened into a picture, and a document that was searchable before is searchable afterwards. Merging is a copy, not a conversion, and it should not cost you anything.
Three files at a time, and why
The free tier handles three files a session and 25 MB each. That is a real ceiling rather than a nudge: the work happens in your browser, and the limit is there because a tab has a finite amount of memory to do it in. If you routinely join more than that, an account raises both limits considerably.
Doing this from your own code
/api/v1 combines two documents into one. Each call makes or replaces a single document. What the API does do.Questions
How many files can I merge at once?
Three in one session on the free tier, at up to 25 MB each. The limits are checked in the browser before anything is opened.
Does merging reduce quality?
No. Pages are copied across as they are — nothing is re-compressed, and text stays text.
Can I merge a locked PDF?
Drop it in and you will be asked how to unlock it first. A PDF that is only locked against printing and copying needs no password; one that will not open without a password needs the password.
Can I mix in images or Word files?
Convert them first — images with the JPG-to-PDF tool, a .docx with the Word-to-PDF tool — then merge the results.
Are my files uploaded to merge them?
No. The joining happens in this tab and the finished PDF is written on your computer.
Next
| Tool | What it does | Runs in | Same thing, programmatically |
|---|---|---|---|
| Split a PDF | Pull out the pages you want, or make one file per page. | your browser | GET /api/v1/documents/{id}.pdf |
| Reorder PDF pages | Drag pages into the right order. | your browser | the document model |
| Delete pages from a PDF | Remove the pages you do not want to send. | your browser | the document model |
| Convert JPG to PDF | Turn photographs into one document with pages. | your browser | POST /api/v1/pdfs |