Merge PDFs
Combine multiple PDFs into one document
Drop PDF files to merge
Up to 20 files, 100 MB each
How to use Merge PDFs
- Drop multiple PDF files into the upload zone.
- Reorder them using the arrow buttons — the top document's pages come first.
- Click 'Merge' to combine them into a single PDF.
- Download the merged PDF.
When to merge PDFs
Merging PDFs is useful for combining scanned documents, bundling a contract and its appendices, consolidating expense receipts, or joining chapters of a larger document. A single PDF is easier to share, archive, and reference than a folder full of separate files.
This tool uses pdf-lib to copy pages between documents while preserving text, images, and most visual formatting. The output is a new PDF — your source files remain unchanged.
For very large merges, consider the combined file size. A merged PDF containing many high-resolution scans can quickly exceed email attachment limits, so compressing after merging is often a good next step.
Frequently Asked Questions
How many PDFs can I merge at once?
Up to 20 PDFs per batch, with a combined size limit of 200 MB. For larger projects, merge in smaller groups.
Can I reorder documents?
Yes. Drag the handle on each document to reorder them before merging. The final PDF will have pages in the order shown.
Are bookmarks and form fields preserved?
Page content and basic metadata are preserved. Bookmarks, form fields, and annotations from the source PDFs may or may not survive — pdf-lib's support for these features is limited.
Is my data safe?
Yes. PDFs are processed in your browser using pdf-lib. Files are never uploaded.