Merge PDF
Merge multiple PDF files into a single document — free, private and instant. Everything happens in your browser; your files never leave your device.
Runs entirely in your browser — no uploadsAbout this tool
Merge PDF joins two or more PDF files into one document, in exactly the order you choose. Page size, orientation and quality of the originals are preserved.
Because merging runs entirely inside your browser using pdf-lib, your documents are never uploaded to any server — the operation even works offline once the page has loaded.
FAQ
What is the maximum file size?
There is no hard server limit because nothing is uploaded — you are only limited by your device’s memory. Files up to roughly 100 MB each work comfortably on most computers.
Can I reorder files before merging?
Yes. Use the up and down arrows on each file to set the exact order pages will appear in the merged PDF.
Are bookmarks and form fields preserved?
Pages are preserved perfectly. Document-level extras such as bookmarks may be dropped by the merge engine, but visible page content, text and images stay identical.