Merge PDF
Combine multiple PDF files into one document instantly.
or click to browse — supports PDF files up to 100MB
How to use
- 1 Drop or click to upload your file
- 2 Adjust options if shown
- 3 Click Run Tool
- 4 Download your result instantly
- ✓ Files up to 1GB
- ✓ Unlimited jobs/hour
- ✓ Batch processing
- ✓ Priority support
Files are processed securely and permanently deleted within 1 hour. We never store, read, or share your documents.
Why this works
Combine multiple PDFs into a single document — bank statements, contracts, invoices, exam papers — in the exact order you choose. No page limit on the free tier.
Merging is the most common PDF task after compression. Common cases: a mortgage application that needs three bank statements stitched together; a freelancer combining contracts, invoices and W-9s into one package for the client; a teacher building a single exam PDF from question sheets and an answer key.
Drop your files into the upload box in any order — once they're loaded you can drag them into the order you want. The output is one PDF with all the source pages concatenated, in the order you specified. Page numbers from the source files aren't rewritten; if you need a unified page-number sequence run the result through our Page Numbers tool next.
Mixed inputs work. You can merge born-digital PDFs (Word exports, designer-exported invoices) with scanned PDFs in the same job. The combined output keeps each source's original quality and resolution — we don't down-sample. If the combined file is too large for your downstream use, run it through Compress after.
Merging is reversible if you change your mind: use Split to break a PDF back into individual pages or page ranges. Merge and Split together cover most reordering workflows.
Files are processed over HTTPS, removed within one hour, and never inspected. No watermark on any plan.
Privacy note: this tool supports our in-browser processing mode. When you pick "Process in your browser" above the upload zone, the entire merge operation runs locally using pdf-lib — your files never leave your device. Check your browser's Network tab while running and you'll see zero outbound requests during processing. For very large multi-file merges (hundreds of MB combined) the server mode is still available; for typical 5–50 MB merges, browser mode is faster and verifiably private.
How it works
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1Upload your PDFsDrop multiple PDFs into the upload box, or click to browse. You can also drag a ZIP of PDFs — they'll be unpacked automatically.
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2Reorder if neededDrag each file thumbnail into the order you want. The first file becomes the first pages, the second file follows, and so on.
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3Run the mergePress Merge. The job typically finishes in 2–5 seconds even for 20+ files.
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4Download the combined PDFYou'll get one PDF with all the source pages, in your chosen order. Files are auto-deleted from our servers within one hour.
Real-world uses
Mortgage applicants
Bank statements from three months arrive as three separate PDFs. Lenders want one file — merge before uploading.
Freelancers
Combine contract, invoice, and tax form into one client package — no email-attachment juggling.
Teachers
Build an exam from a question paper and answer key while keeping page numbering intact.
HR teams
Compile a candidate package: resume + cover letter + portfolio + work-authorisation docs into one PDF for the hiring manager.
Common questions
Can I run this tool without my file leaving my device?
Yes — this is one of the tools that supports our in-browser privacy mode. Pick "Process in your browser" above the upload zone and the entire operation runs locally via pdf-lib. Open the Network tab in your browser's DevTools while running the tool: you will see zero outbound requests during processing. That is the verifiable basis for the claim that your file never leaves your device. Server mode remains available for very large files or features that need server-grade processing.
How many PDFs can I merge at once?
There's no hard cap on the number of files — only on the combined upload size. Free accounts can merge up to 25 MB of combined input; Pro lifts this to 500 MB. Most everyday merge jobs (3–10 files of a few MB each) finish well within either cap.
Will the page order be preserved?
Yes. Within each source PDF, page order is preserved exactly. Across files, the output order matches the order you set in the upload list — drag to reorder before pressing Merge.
Can I merge scanned and digital PDFs together?
Yes, mixed inputs work. Each source keeps its original resolution and quality in the output. The merged file may be large if any source was a high-res scan — run it through Compress afterwards if needed.
Does merging strip form fields, signatures, or annotations?
No. Form fields, digital signatures, comments and annotations are preserved from each source PDF into the merged output. Field names are kept unique by appending the source filename if collisions occur.
Can I merge specific page ranges instead of whole files?
Not in the basic merge tool — but the workflow is: use Extract Pages to pull the ranges you want from each source, then Merge the extracted PDFs. Two-step, fully free.
Is there a watermark on the merged file?
No. PDFRun never adds a watermark, on any plan. Merge output is bit-clean.