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About this tool
Combine all pages from selected PDFs into one PDF. Choose a front-scan PDF and a back-scan PDF. Check source mapping and actual output previews before exporting one PDF.
Common uses
- Combine all pages from selected PDFs into one PDF.
- Select the PDFs and check their displayed order.
- Interleave front/back scans
How to use it
- 1.Select the PDFs and check their displayed order.
- 2.For scan mode, choose the two PDFs, back order and unequal-count policy; inspect the source mapping.
- 3.Merge, review the actual output and download the PDF.
Executable examples
One final front page
Front3 pages, back2 pages; reverse back order; final-front policy
5 pages: front1, back2, front2, back1, front3
Extra back page explicitly appended
Front2 pages, back3 pages; reverse back order; append policy
5 pages: front1, back3, front2, back2, back1
Limits and notes
- Up to 10 files, 30 MiB per file, 100 MiB combined input, 200 pages and 120 MiB output. Whole documents are appended; this tool does not offer page-range selection.
- Two PDFs, 10 MiB each /20 MiB combined; 1–50 pages each /up to100 output pages, 40 MiB output. Reading, processing and each document preview have a30-second deadline, with cancellation. Decoded PDF memory is not hard-capped.
- Front page first in each pair. Reverse reorders the entire back stream before pairing; it does not rotate images. Strict default rejects unequal counts. Final-front allows equal counts or exactly one extra front; append keeps every leftover in that stream order. No blank insertion, page removal or automatic order detection. Both PDFs must contain at least1 page.
- Whole pages are copied without scaling or rotation changes; MediaBox/CropBox and quarter rotation remain. Hidden content and annotations may remain. This is not redaction/sanitization or guaranteed lossless rendering; document bookmarks/tags/signatures are not preserved. Invalid geometry, non-default UserUnit, encryption, AcroForm and signature permissions reject. Thumbnails use a160px edge, omit annotations and may omit images above2 million pixels; any failed preview prevents download. Settings/reset/files/mode/locale invalidate output. Local processing, no upload/persistence or PDF-supplied external resource lookup.
- Whole-file mode rejects PDFs with interactive forms to avoid silently losing fields. Flatten a copy first.
Frequently asked questions
What does this tool do?
Combine all pages from selected PDFs into one PDF.
What should I check before using the result?
Up to 10 files, 30 MiB per file, 100 MiB combined input, 200 pages and 120 MiB output. Whole documents are appended; this tool does not offer page-range selection.
Unequal page-count policy?
Front page first in each pair. Reverse reorders the entire back stream before pairing; it does not rotate images. Strict default rejects unequal counts. Final-front allows equal counts or exactly one extra front; append keeps every leftover in that stream order. No blank insertion, page removal or automatic order detection. Both PDFs must contain at least1 page.