PDF Merge
Combine multiple PDF files into one document. Drag, drop, reorder with arrows, download. No file size limit, no upload, no watermark.
Drop PDF files here or click to browse
Select multiple files at once
What is the PDF Merge?
A PDF merge tool stitches multiple PDF files together into one document, preserving every page from each source: text, images, vector graphics, embedded fonts, form fields. The order of the source files becomes the order of pages in the output. Useful for combining receipts into one expense report, scanned pages into one document, or chapters into one book.
How to use the PDF Merge
- 1
Drop in your PDF files
Drag PDFs onto the upload area, or click to browse. Multiple selection works in the file picker. Each file shows its name, page count, and size.
- 2
Reorder the list
Arrow buttons in the Order column move a file up or down. Position 1 becomes the first pages of the merged PDF, position N becomes the last.
- 3
Click Merge
The pdf-lib library copies pages from each source into a new document, preserving formatting and metadata. Large stacks (50+ files) take a few seconds.
- 4
Download the result
Click Download Merged PDF to save as merged.pdf. The summary tells you the file size; the in-page success banner confirms the page count.
Frequently Asked Questions
Is there a file size limit?
No hard limit, but practical limits exist. Since everything runs in the browser using pdf-lib, total file size is bounded by your device's available memory. Combined files under 100 MB merge in a few seconds on most devices. Above 500 MB, expect noticeable processing time and possible browser slowdown on lower-end machines.
Are my PDF files uploaded to a server?
No. The merge runs through pdf-lib (a pure-JavaScript PDF library) inside your tab. Open DevTools, switch to Network, and you'll see no outbound request when you click Merge. Safe for confidential contracts, financial records, medical documents, anything you wouldn't email to a third-party converter.
Can I change the page order?
Yes, at the file level. Use the up/down arrow buttons in the Order column to reorder the source files; the merged PDF follows that order top-to-bottom. To reorder individual pages within a single source PDF, you'd need to split that PDF first (this tool merges only; splitting is a separate workflow).