How do I merge PDF files online?

Upload your PDF files, arrange them in order, then click Merge. Your combined PDF downloads instantly in your browser.

Is there a file size limit?

The tool runs using PDF-lib in your browser. Most PDFs up to 100MB merge without issue depending on your device memory.

Yes. All processing happens locally in your browser. Your files are never uploaded to any server.

Yes. Drag and drop the uploaded files to set the merge order before clicking the Merge button.

← All Tools / Merge PDF

Select two or more PDF files. Drag to reorder them, then click Merge to download the combined PDF.

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Drop PDF files here

或点击浏览

Select or drop your PDF files into the zone above.
Drag the files in the list to set the order they will appear in the merged PDF.
点击 Merge & Download PDF — the combined PDF is created instantly in your browser and downloaded.
Your files are never uploaded to any server.