PDF Merge
Process your regular or scanned PDF documents anytime, anywhere, on any device—powered by intelligent algorithms.
Trusted for 10k+ file conversions.
Upload multiple PDFs, drag to reorder, then click merge.
Drag or click to select multiple PDFs
Single file max 500MB
Merge multiple PDFs into one online for free. Drag to reorder, fast processing, format preserved. No file limits, no signup. Files auto-deleted.
How your file is handled
Each uploaded PDF and the merged output flow through HTTPS and are used only for this single merge task. The download link expires within an hour, after which the source files and the merged file are wiped from our processing nodes.
When this tool fits best
- Bundle a contract with its annexes
Combine the master contract, side letters and signed scan pages in a fixed order so the counter-party signs once.
- Compile a weekly or monthly report
Stitch each team member's individual report PDFs into a single deliverable in department order.
- Glue a paper with appendices and references
Combine the body, appendices and reference list into a single PDF for review submission.
Features
- Drag-and-drop ordering
Reorder rows in the upload list — the list order is exactly the final order of the output PDF.
- Mixed paper sizes preserved
A4, A3 and Letter pages can sit side by side in the merged file; each page keeps its original dimensions.
- Bookmarks bundled into a hierarchy
If sources include bookmarks, we build a top-level bookmark tree using the file names so navigation stays usable.
- No hard cap on file count
Add as many PDFs as you need to a single merge job.
- Internal links stay where possible
Page-internal navigation inside each source is preserved; cross-file references obviously can't be.
- Append more files mid-flight
Already-uploaded PDFs stay in the list — drop in additional files to append without re-uploading.
How to use
- 1Upload several source PDFs
Drop in or select multiple files (up to 500MB each); add more rounds if needed.
- 2Drag rows into the right order
The row order is the final merge order — drag rows up or down.
- 3Run the merge
Click "Merge PDFs" and we concatenate the pages in list order.
- 4Download the merged file
You get a single PDF whose size is roughly the sum of the inputs.
Limits and things to watch out for
- Encrypted source PDFs need decryption— Remove the password from each source before uploading.
- Form fields with the same name conflict— If multiple sources have form fields with identical names, values may overwrite each other after merging.
- No automatic blank pages between files— Insert separator pages in the source documents or use a separate insert tool after merging.
- Cross-file references break— Bookmarks that jumped from one source PDF to another are lost after the merge.
FAQ
- QHow big and how many pages will the merged file be?
- Roughly the sum of all source pages and sizes; we don't compress during merging.
- QHow many source files can I merge at once?
- There's no fixed cap, but a few dozen at a time is the comfortable upper bound for speed and reviewability.
- QI picked the wrong order — can I fix it?
- Drag rows freely until you click "Merge PDFs". Reorder as many times as you like.
- QAre bookmarks preserved?
- Yes — original bookmarks per file are kept and we wrap them in a top-level bookmark tree by source file name.
- QHow do I merge only a few pages from each PDF?
- Run those pages through the Split tool first, then add the resulting subsets to the merge list.
- QCan I split the merged PDF later?
- Of course — the merged file is just a normal PDF and can be split by page or range.
- QCan I mix different paper sizes?
- Yes. Each page keeps its original dimensions in the merged file.
- QHow long is the result kept?
- It's purged within an hour.
Trim before you merge
If you only need certain pages from each source PDF, split them out first and only feed the trimmed subsets into the merge — the result is leaner and avoids carrying extra pages along.