Merge PDF — Combine PDF Files in Your Browser
ImageMerge PDF is a browser-based PDF tool that copies the pages of multiple PDF files, in the order you set, into a single PDF document.
What is it
Merge PDF is used to bundle contracts, scans, or reports that are split across several PDF files into one document. After adding files, drag them in the list or use the up/down buttons to change the order; every page of each file is then copied into the new PDF in that order. Pages are copied as original page objects instead of being re-rendered as images, so text, fonts, and image quality are preserved. Each file can be up to 50MB, and password-protected PDFs are not supported. All processing happens in browser memory and no file is sent to a server.
How to use
- 1Add two or more PDF files to merge.
- 2Drag items in the list or use the up/down buttons to reorder them.
- 3Press the Merge PDF button.
- 4Download the merged PDF file.
Reference
| Item | Value |
|---|---|
| Input | 2 or more PDF files |
| Output | 1 merged PDF |
| Page order | File order shown in the list |
| File limit | 50MB per file |
| Encrypted PDF | Not supported |
| Processing location | Browser (no server upload) |
Sources & standards
- ISO 32000-2 — Portable Document Format (PDF 2.0) - PDF Association
- pdf-lib — Create and modify PDF documents in JavaScript - pdf-lib
- MDN Web Docs: Client-side web APIs - MDN Web Docs
FAQ
Are my PDF files uploaded to a server?
No. File selection, merging, and download creation all run in your browser; the files never leave your device.
How many PDFs can I merge?
There is no fixed file count limit, but each file must be 50MB or smaller, and many very large files can fail due to browser memory limits. Compress large PDFs first if needed.
Does merging reduce quality?
No. Pages are copied as original page objects rather than re-rendered images, so text, fonts, and image quality are preserved.
Can I merge password-protected PDFs?
No. Encrypted PDFs are not supported. Remove the password first, then merge the unlocked file.