How do I merge PDF files?

Upload two or more PDF files, arrange them in the order you want, and click Merge. The combined PDF will download automatically.

Is there a file size limit?

No. Since all processing happens in your browser, there are no server-imposed limits. Very large files may be slower depending on your device.

Are my files uploaded to a server?

No. All merging happens locally in your browser. Your files never leave your device.

Can I change the order of pages?

Yes. Use the arrow buttons to reorder files before merging. Pages will appear in the final PDF in the order shown.

Merge PDF

Combine multiple PDF files into a single document

Drop PDFs here

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Frequently Asked Questions

What is Merge PDF?

Merge PDF is a free browser-based tool that lets you combine multiple PDF files into a single document in seconds. Whether you have scanned receipts, separate report chapters, or a collection of forms, this tool joins them into one continuous PDF while preserving the original formatting, bookmarks, and hyperlinks of each source file. It is powered by the pdf-lib JavaScript library, which means every byte of your data stays on your device. No file is ever uploaded to a remote server, so your confidential contracts, tax returns, and personal documents remain completely private.

When to Use Merge PDF

This tool is ideal whenever you need to consolidate multiple PDFs into one file for sharing, archiving, or printing. Common scenarios include:

Combining cover letters, resumes, and reference letters into a single application packet.
Joining monthly invoices or bank statements into one annual file for bookkeeping.
Merging individually scanned pages into a complete multi-page document.
Assembling presentation handouts, agendas, and appendices before a meeting.
Creating a unified portfolio from separate project reports or design mockups.

How It Works

Drag and drop your PDF files into the upload area or use the file picker to select them. Reorder the files in the list if needed by dragging them into the desired sequence. Click the merge button, and the tool reads each PDF entirely within your browser using pdf-lib, copies every page into a new combined document, and generates a download link. The entire operation runs locally in JavaScript, so it works offline once the page has loaded. There is no file-size cap enforced by a server, no account sign-up required, and no watermark added to the output. Your merged PDF is ready to download instantly.