Merge PDF

How PDF merging works

Merge PDF combines multiple full PDF files into one PDF in the file order you choose. The process runs locally in your browser, so your documents stay on your device from start to finish.

When to use this tool

PDF merging is useful when you want to turn separate PDF files into one clean document for sharing, storage, printing, or review. It is commonly used for reports, contracts, invoices, scans, appendices, and multi-part exports.

• Combine separate scans into one PDF before sending them.
• Join a cover page, main report, and appendix into one document.
• Merge invoices, receipts, or supporting documents into a single file.
• Create one final PDF from multiple exported sections.

Need to combine selected pages from different PDFs instead of merging whole files? Use Join PDF pages from multiple files. Need to change page order after merging? Try Reorder PDF pages visually. Need to split the final document later? Use Split a PDF into smaller parts.

Step-by-step: merge multiple PDFs into one

Merging PDFs takes just a few steps:

• Add your PDFs. Drag and drop files into the box above, or click to choose from your device.
• Arrange the order. Use move up, move down, remove, or reverse order so the files appear exactly how you want them in the final PDF.
• Merge PDF. Click Merge PDF. The tool combines the files locally in your browser.
• Save the result. Download the final merged PDF to your device.

Why file order matters

The list order is the merge order. That means the first file becomes the beginning of the final PDF, the second file follows it, and so on. If your source files contain different page sizes or orientations, those differences usually stay in the final merged PDF.

• Top of the list = first pages in the merged file.
• Bottom of the list = last pages in the merged file.
• Use reverse order if you added files in the opposite sequence.
• Check covers, appendices, and supporting files before merging so the final document reads correctly.

Privacy, limits and how this tool treats your files

FileYoga is built around a simple rule: your files stay with you. PDF merging runs locally in your browser, so your PDFs are never uploaded to FileYoga servers.

If you are working with private documents, contracts, statements, or internal files, this setup means you keep control from start to finish.

Tips for best results

• Check the file order carefully before merging.
• Use clear file names so the sequence is easier to understand.
• Merge fewer files at a time if you are working with very large or image-heavy PDFs.
• Open the merged output after saving to confirm the order, page sizes, and orientations look right.
• If needed, compress the final file after merging to reduce its size.

Troubleshooting

• Merge button does nothing: add at least 2 PDF files first.
• The final order looks wrong: move files up or down before merging, then run the merge again.
• The browser is slow or freezes: close heavy tabs or merge fewer files in smaller batches.
• A file will not load: the PDF may be damaged, encrypted, or unusually complex — re-save it in a desktop PDF app and try again.
• The merged PDF is larger than expected: combining files can increase size because images, fonts, and embedded resources are kept. Use Compress PDF afterward if needed.
• Page sizes or orientations look mixed: the merged PDF usually keeps the original layout of each source file. Reorder or normalize source PDFs first if consistency matters.
• Some forms, links, or bookmarks behave differently: complex interactive PDFs do not always merge perfectly. Review the final file before sharing important documents.

Frequently asked questions