PDF Tools

Merge PDF Online Free – Combine PDF Files

Merge multiple PDF files into one document online for free. Reorder PDF files and combine them directly in your browser.

Your files are processed in your browser and are not uploaded to our servers.

PDF files

Drop PDF files here or click to browse

Add two or more files, then reorder them. No account. Nothing is uploaded.

Merge

Upload two or more PDFs, arrange them, then download one combined file.

Files stay in this browser tab. Extract pages first with Split PDF, or shrink the download with Compress PDF.

About this tool

Merge PDF allows you to combine multiple PDF documents into a single organized file directly in your browser. All page extraction and document assembly are performed locally on your device using pdf-lib, meaning your files are processed in local memory and are never uploaded to any remote server.

How to use

Click or drop two or more PDF files into the upload area.
Review the file queue and use the Up and Down arrow buttons to reorder PDF files in the exact sequence you want them merged.
Remove any unwanted files using the trash icon.
Click “Merge PDFs” to combine the pages and download one PDF named from the first file.

Formula and methodology

Each uploaded PDF is parsed client-side using pdf-lib. Pages from each document are copied into a newly created PDFDocument in the designated sequence and saved as a downloadable binary blob in your browser.

Worked example

Combining a 2-page invoice.pdf and a 3-page receipt.pdf produces one 5-page file, invoice-merged.pdf, with the invoice pages first.

Frequently asked questions

Is there a limit on how many PDFs I can merge?+

You must add at least two PDF files to merge. Because processing happens in your browser's memory, file handling depends on your device's available RAM and browser limits.

Can I merge password-protected or encrypted PDFs?+

No. Encrypted or password-protected PDF files cannot be decrypted by the browser merge tool. Please remove password protection before combining files.

Are my PDF files uploaded to a server?+

No. All PDF processing runs entirely on your device inside your web browser using client-side JavaScript. Your documents never leave your computer or phone.

Can I reorder individual pages within a PDF before merging?+

The Up and Down arrow controls reorder whole PDF files, not individual pages within a document. To extract or reorder specific pages first, use Split PDF before merging.