How to merge PDFs
- Drop your PDF files onto the box above, or click it to browse. Add as many as you need.
- Use the ↑ ↓ arrows to put them in the right order. The page count and size of each file are shown so you can check you have the right ones.
- Click Merge. Within a second or two, download
merged.pdf.
Nothing is sent anywhere. The merging is done by your browser with the open-source pdf-lib library, and the result exists only on your device until you save it.
Why merge without uploading?
Most online PDF tools work by uploading your file to their server, processing it there, and letting you download the result. That means a copy of your document sits on someone else’s computer — often for hours, sometimes indefinitely, and usually under terms of service you haven’t read. For a lease, a tax return, a signed contract or a medical report, that’s an unnecessary risk.
Browser-side processing avoids the problem entirely. It’s also faster for large files (no upload or download wait) and works on a slow connection once the page has loaded.
What you can merge
- Any standard PDF, including scanned documents, forms and exported presentations.
- Files of different page sizes — each page keeps its own size and orientation.
- Files from different sources: a PDF from Word, one from a scanner and one from a phone camera app merge without issues.
Form fields, bookmarks and links inside each file are preserved on their pages. Bookmarks (the outline panel) are not combined across files.
Common uses
- Applications and submissions — combine a cover letter, résumé and portfolio into one attachment.
- Invoicing — join an invoice with its receipts or timesheets.
- Scanning — phone scanners often produce one PDF per page; merge them into one document.
- Reports — put chapters exported separately into one file for distribution.
- Legal and finance — assemble exhibits or supporting documents in the required order.
Tips
- Order matters. Drag order is the page order; double-check before merging.
- Need only some pages? Use the split PDF tool first to extract them, then merge.
- Have images instead of PDFs? Use JPG to PDF to turn them into a PDF, then merge.
- File too large to email? Merged size is roughly the sum of the inputs; if it’s over your email limit, send a link instead or reduce the image resolution before creating the PDFs.
Frequently asked questions
Are my files uploaded to a server?
No. The merge happens inside your browser using JavaScript. Your PDFs never leave your computer, which makes this safe for contracts, medical records and anything else confidential. You can confirm by disconnecting from the internet after the page loads — it still works.
Is there a file-size or page limit?
There's no imposed limit. Because processing is local, the practical limit is your device's memory — files of a few hundred megabytes merge fine on a modern laptop; very large scans may be slow on older phones.
Does merging reduce quality?
No. Pages are copied as-is, with their original fonts, images and vector graphics. The merged file is usually about the sum of the input sizes.
Can I merge password-protected PDFs?
Files with an open password (needed to view them) can't be merged until you remove the password in the app that created them. Files with only editing restrictions usually merge fine.
Last updated August 26, 2026.