How many PDFs can I merge at once?

There is no hard limit. You can merge as many PDFs as your browser can load into memory simultaneously. Most devices handle dozens of files without issues.

Is the file order preserved?

Yes. Files are merged in the order they appear in the list. You can remove and re-add files to control the order.

Are bookmarks and links preserved?

Page content, images, text, and links are preserved. Top-level document bookmarks from individual files are not merged into a combined bookmark tree in this version.

Can I merge password-protected PDFs?

No. Remove password protection from the PDF first using your PDF reader's security settings, then merge here.

Does this work on iPhone?

Yes. Use Safari on iPhone or iPad, tap the upload area, and select PDFs from the Files app or iCloud Drive.

What is the output file format?

The merged output is a standard PDF 1.7 file compatible with all PDF readers including Adobe Acrobat, Preview, and Chrome's built-in viewer.

PDF Merger

Combine multiple PDF files into one document in your browser. Drop your PDFs below, arrange the order, and download the merged result. No file is ever uploaded — everything runs locally with pdf-lib.

100% client-side · no upload · no signup

Drop PDFs here or browse files browse files Select 2 or more PDF files

How to merge PDFs

Drop two or more PDF files into the upload area, or click to browse and select them.
Review the file list. Click the ✕ next to any file to remove it from the merge.
Click Merge PDFs — processing completes in seconds.
Click Download merged.pdf to save the combined document.

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常見問題

How many PDFs can I merge at once?: There is no hard limit. You can merge as many PDFs as your browser can load into memory simultaneously. Most devices handle dozens of files without issues.
Is the file order preserved?: Yes. Files are merged in the order they appear in the list. You can remove and re-add files to control the order.
Are bookmarks and links preserved?: Page content, images, text, and links are preserved. Top-level document bookmarks from individual files are not merged into a combined bookmark tree in this version.
Can I merge password-protected PDFs?: No. Remove password protection from the PDF first using your PDF reader's security settings, then merge here.
Does this work on iPhone?: Yes. Use Safari on iPhone or iPad, tap the upload area, and select PDFs from the Files app or iCloud Drive.
What is the output file format?: The merged output is a standard PDF 1.7 file compatible with all PDF readers including Adobe Acrobat, Preview, and Chrome's built-in viewer.

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