How to merge PDFs on a computer with bopdf
- Open this page in Chrome, Edge, Safari or Firefox.
- Select the PDFs (hold Ctrl on Windows or ⌘ on Mac to pick several) or drag them from File Explorer / Finder onto the box.
- Put them in order and click “Merge PDF”. The combined file goes to your Downloads folder.
Merge PDFs on Windows without installing anything
Windows has no built-in way to combine PDFs — “Microsoft Print to PDF” can only print one document at a time. Instead of installing a PDF suite, use bopdf in Edge or Chrome: it works offline once loaded and handles dozens of files. Your documents stay on your PC.
Merge PDFs on a Mac with Preview (built in)
- Open the first PDF in Preview and choose View → Thumbnails.
- Drag the other PDF files from Finder into the thumbnail sidebar where you want them.
- Choose File → Export as PDF to save the combined document.
Preview is fine for two files but gets fiddly with many documents or when you need to reorder whole files; bopdf’s list with drag-and-drop ordering is faster for that.
After merging
Need to drop a page or reorder? Use Organize PDF. File too large to email? Use Compress PDF or compress to a specific size.
🔒 Your files never leave your device
bopdf processes your documents locally with JavaScript (pdf-lib and Mozilla pdf.js) inside your browser tab. Your PDF is never uploaded, stored or seen by us — you can even disconnect from the internet after the page loads and the tool keeps working. When you close the tab, everything is gone.
Frequently asked questions
Is there a free way to merge PDFs on Windows 10/11?
Yes — bopdf runs in Edge or Chrome for free, without installing software or uploading files.
How do I merge PDFs on a Mac without Preview?
Use bopdf in Safari or Chrome: select the files, order them and click Merge PDF.
Can I merge PDFs offline?
Once this page has loaded, merging works even if you disconnect from the internet, because everything runs locally.
Will merging keep the quality?
Yes. Pages are copied without re-compression.
Are my files uploaded to a server?
No. Everything happens in your browser on your own device. Files are never sent over the internet, which makes bopdf suitable for confidential documents.
Is there a file size limit?
There is no fixed limit, but very large files (hundreds of MB) depend on your device memory. On phones, files up to about 100 MB usually work well.