Merge PDF
Combine multiple PDF files into one document, in order, right in your browser. Runs on your device — nothing is uploaded, nothing is stored.
Drop PDFs here or click to select
Support for multiple files • Up to 50MB each
Merge PDF combines several PDF files into a single document, in the order you put them. It's the fix for the everyday mess of a report that arrived as three separate exports, a contract whose signature page came back as its own file, or a stack of scanned receipts you need to submit as one attachment.
Add at least two files, use the move-up and move-down buttons beside each one to set the sequence, and the tool stitches them end to end. Pages are copied across untouched — text stays selectable, images keep their original resolution, and nothing is re-encoded or re-compressed on the way through.
Because the whole job is assembled in your browser there's no upload step, no account, no daily file cap and no watermark on the result. The practical ceiling is your own device's memory rather than someone's server policy.
Why this runs on your device
The documents people merge are rarely throwaway: signed contracts, bank statements, medical results, passport scans, a finished tax return. A hosted merge service has to hold a complete copy of every one of those files on its disks to do the work, however briefly, and you have to take its retention policy on faith. Doing it locally removes that step altogether — the tab reads the bytes, joins them, and hands you back a download. There is no copy on anyone else's machine to be retained, indexed, subpoenaed or leaked.
- Add at least two PDF files.
- Use the move-up and move-down buttons to set the order.
- Merge them into a single document.
- Download the combined PDF.
- Merging joins whole files. You can't pick individual pages while merging — split or extract the pages you want first, then merge the pieces.
- Only the pages are copied. A source PDF's bookmarks and outline (its clickable table of contents), its document-level form definition, and any embedded file attachments are not rebuilt in the merged document, so interactive forms may stop working. TODO(verify): confirm exact annotation behaviour against pdf-lib's copyPages on a form-heavy sample.
- Password-protected PDFs can't be opened at all, and the tool reports them with a generic "Invalid PDF file" message rather than saying a password is the problem. Remove the protection in your PDF reader first.
- The merge runs on the page's main thread with every file held in memory at once, and there's no progress bar for it. A very large batch — hundreds of megabytes of scans — can make the tab unresponsive or run out of memory on a phone or a low-RAM laptop.