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PDF CodexNeo

Merge PDF Files

Combine multiple PDFs into one document. Drag to reorder, then merge in seconds.

Up to 20 files 100 MB total Free - no signup Deleted in 5 min

Drop your PDF files here

or browse files

PDF only · Up to 20 files · 100 MB total

How to Merge PDF Files

1. Upload PDFs

Drop or browse to add 2–20 PDF files. Each file shows its name and size.

2. Drag to Reorder

Drag the file cards into the exact order you want them to appear in the final PDF.

3. Merge & Download

Click Merge PDF. Your combined file is ready in seconds and auto-deleted after 5 minutes.

Everything You Need to Merge PDFs

Drag-and-Drop Reordering

Rearrange files in any order before merging. Each card shows the filename and file size at a glance.

Add More Files Anytime

Upload your initial batch, then click Add More to include additional PDFs without losing your current order.

Named Bookmarks

Optionally add a bookmark for each input file so readers can jump directly to any section in the merged PDF.

Odd-Even Interleave

Interleave pages from two PDFs - perfect for combining odd and even pages from a double-sided scan.

Up to 20 Files, 100 MB

Merge up to 20 PDF files with a combined total of up to 100 MB in a single operation.

Secure & Private

All files processed over HTTPS and automatically deleted within 5 minutes. Never shared with third parties.

Frequently Asked Questions

How do I merge PDF files for free?
Go to pdf.codexneo.com/merge-pdf/, upload 2 or more PDF files, drag to reorder them if needed, then click Merge PDF. Your combined file downloads instantly with no signup required.
How many PDF files can I merge at once?
You can merge up to 20 PDF files at once, with a combined total size of up to 100 MB. Each individual file can be up to 20 MB.
Can I change the order of files before merging?
Yes. After uploading, drag the file cards to rearrange them in any order. The top card becomes the first pages of the merged PDF, and so on down the list.
What does the bookmark option do?
When enabled, each input PDF gets a named bookmark in the merged file using the original filename. This lets readers jump directly to any section using the PDF bookmark panel in Adobe Reader or any PDF viewer.
Does merging PDFs reduce quality?
No. PDF CodexNeo merges files at the PDF structure level without re-encoding any content. Text, images, fonts, and vector graphics are preserved exactly as they appear in the original files.
How long are merged files stored?
All uploaded PDFs and merged output files are automatically deleted from the server within 5 minutes. Files are never shared with third parties and are processed over a secure HTTPS connection.
Reviewed by the PDF CodexNeo editorial team ·