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Merge PDF

Runs in browser

Combine multiple PDF files into one document — drag, reorder, and merge with no upload and no watermark.

Last updated 31 Mar 2026

Merge multiple PDF files into a single document in seconds. Drag and drop your files, reorder them freely, and download the combined PDF with no page limits, no watermarks, and no upload required. All processing runs locally in your browser using pdf-lib. Your documents never leave your device, so privacy is guaranteed.

Click to upload or drag and drop

PDF up to 50MB
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How to use

  1. 1

    Upload your PDF files

    Click the upload area or drag and drop two or more PDF files. Add as many as your browser's memory allows.

  2. 2

    Reorder the files

    Use the up and down arrows next to each file to arrange them in your preferred order before merging.

  3. 3

    Merge and download

    Click Merge PDFs and download the combined document instantly — no watermark, no size limit.

Frequently asked questions

Are my files uploaded to a server?
No. All merging runs in your browser using pdf-lib. Your files never leave your device and nothing is stored anywhere.
Is there a page or file limit?
There is no hard limit. You can merge as many PDFs as your browser's memory allows — typically dozens of files totalling several hundred megabytes without any issues.
Does merging add a watermark?
No. The merged PDF has no watermarks, no branding, and no added pages. The output is a clean, unmodified combination of your input files.
Will bookmarks and hyperlinks be preserved?
Page content, annotations, and form fields are preserved. Bookmarks and cross-document links may not carry over into the merged document.
Does merging reduce PDF quality?
No. Pages are copied byte-for-byte into the new document — there is zero quality loss.
Can I rearrange the page order before merging?
Yes. Use the up and down buttons next to each file to set the order. The merged PDF follows your chosen sequence exactly.
What is the maximum file size per PDF?
Each individual file can be up to 50 MB. Total combined size depends on your device's available memory.
Can I merge password-protected PDFs?
Only PDFs you can open without a password can be merged. Owner-restricted PDFs that you can already view will process normally.
How does this compare to SmallPDF or iLovePDF?
Both SmallPDF and iLovePDF upload your files to their servers before merging. Kordu processes everything locally — your documents stay on your device. There are also no file limits, no login walls, and no watermarks.

Combine two or more PDF files into one clean document without uploading

anything. Drag and drop your files, reorder them with the up and down

arrows, and download the merged PDF instantly. No page limits, no

watermarks, no account required.

All merging runs locally in your browser using pdf-lib — your documents

never touch a server. Page content, annotations, and form field data are

preserved byte-for-byte with zero quality loss.

Who is this for: students combining lecture slides, professionals assembling

multi-section reports, lawyers merging exhibits, HR teams building employee

packets, and anyone who needs to send one tidy PDF instead of a folder of

separate files. SmallPDF and iLovePDF upload your files to their servers —

Kordu's merger keeps everything on your device.

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Merge PDF vs Smallpdf

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