Merge PDF Files
Combine multiple PDFs into one in your chosen order
About this tool
Merge two to eight accepted PDFs in the displayed order. Validate each new batch as a unit, retain existing accepted files after a batch error, and generate from the reviewed queue. Two to eight PDFs, each with 1–80 pages and up to 20 MiB; at most 240 pages and 60 MiB combined input. One output PDF, at most 240 pages and 100 MiB. Forms, XFA, widgets, signature permissions and portfolios are rejected. Digital signatures do not remain valid; outlines, attachments and cross-page destinations are not rebuilt. Review ordinary annotations after downloading. PDF content is processed locally, with manual downloads after the complete operation succeeds.
Scenario Recipes
Combine ordered report sections as complete files
Goal: The displayed queue controls whole-file order, and each file keeps its internal order. A rejected new batch leaves the prior accepted queue visible but removes its old result.
- Add the six-page A and four-page B PDFs, keeping the combined queue within 60 MiB and 240 pages.
- Use the arrow buttons to put the files in chapter order and review the full page mapping.
- Confirm and generate the combined document; manually download and inspect section boundaries.
Result: New PDFs match the reviewed source-page mapping and are downloaded manually for inspection.
Failure Clinic (Common Pitfalls)
One file in a selection is invalid
Cause: A mixed valid/invalid batch must not silently appear fully accepted.
Fix: Read the batch error, remove the invalid file and select the intended batch again. Existing accepted entries remain available.
Generated files disappear after a change
Cause: Output bytes belong to the source files and settings used to create them.
Fix: Review and generate again after changing options, order, sources, clearing or switching language. Old downloads do not continue.
A form or signed document is rejected
Cause: Forms, XFA, widget annotations, signature permissions and portfolios are rejected. Page copying does not preserve valid digital signatures or rebuild outlines, attachments and cross-page destinations. Ordinary annotations need output review.
Fix: Use an export or flattening workflow that explicitly supports those features, and retain the original document.
Production Snippets
Combine ordered report sections as complete files
text
Accepted queue: A.pdf (6 pages), B.pdf (4 pages)
→ A1,A2,A3,A4,A5,A6,B1,B2,B3,B4
Move B earlier → B1,B2,B3,B4,A1,A2,A3,A4,A5,A6
New batch [valid.pdf, invalid.txt] → whole new batch rejectedFrequently Asked Questions
What controls the chapter order?
The displayed file queue does. Move files with the arrow buttons; each file retains its internal page order. The preview identifies every source file/page.
Why was a valid PDF not added with another selected file?
A new selection is one batch. If any file fails validation or the combined limits, none of that batch is added. The previously accepted queue remains visible.
Are bookmarks combined into a new outline?
No. This workflow copies the reviewed pages and ordinary annotations but does not rebuild document outlines, attachments or cross-page destinations.
What are this tool’s file and page limits?
Two to eight PDFs, each with 1–80 pages and up to 20 MiB; at most 240 pages and 60 MiB combined input. One output PDF, at most 240 pages and 100 MiB.
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