# Merge PDF

URL: https://shahid09.is-a.dev/tools/merge-pdf/
Author: Muhammad Shahid (https://shahid09.is-a.dev/)
Free tool · runs in your browser

Combine several PDF files into a single document in the order you choose, without uploading them anywhere.

**Quick answer:** Choose two or more PDFs, put them in order with the arrows, and press Merge to download one combined file. Pages keep their original quality, text and size, as they are copied rather than converted. Everything runs in your browser, so your documents never reach a server, and there is no watermark or sign-up.

## How to use it

1. **Choose your PDFs.** Pick several at once, or add them a few at a time.
2. **Set the order.** Use the arrows to move files up and down, and ✕ to remove one.
3. **Merge and download.** Press Merge to get a single PDF.

## Example

Three files are combined into one, in the order you set:

Input:

```
cover.pdf (1 page)
report.pdf (10 pages)
appendix.pdf (3 pages)
```

Output:

```
merged.pdf (14 pages)
```

## Common errors and how to fix them

- **This PDF is password protected**: Remove the password with the [Unlock PDF tool](https://shahid09.is-a.dev/tools/unlock-pdf/) first, then merge.
- **This file could not be read as a PDF**: The file is damaged or not really a PDF. Open it in a PDF viewer to check, and try saving a fresh copy.
- **The browser tab crashes**: The files are too big for your device memory. Close other tabs, or merge in smaller groups on a computer.

## Frequently asked questions

### How do I combine PDF files into one?

Add your PDFs here, arrange them and press Merge. The combined file downloads straight from your browser.

### Are my PDFs uploaded?

No. The file is processed by your own browser and never leaves your device, so it is safe for private documents.

### Does merging reduce quality?

No. Pages are copied as they are, so text stays sharp and selectable, and images are not recompressed.

### Is there a file size or number limit?

There is no set limit. The practical limit is your device memory; several hundred megabytes usually works on a computer.

### Can I merge password-protected PDFs?

Not directly. Remove the password first with the Unlock PDF tool, using the password you already know.

### Can I merge only some pages of a PDF?

Yes, in two steps. Use [Split PDF](https://shahid09.is-a.dev/tools/split-pdf/) to extract the pages you want, then merge the result.

### Are links and bookmarks kept?

Page content and most links are kept. Bookmarks and document-level outlines are usually not carried into the merged file.

### Does it work on iPhone and Android?

Yes, in a current mobile browser. Very large files may struggle on phones with less memory.

### In what order are the files merged?

In the order shown in the list, top to bottom. Use the arrows to change it before you merge.

### How do I make the merged PDF smaller?

Run it through [Compress PDF](https://shahid09.is-a.dev/tools/compress-pdf/) afterwards. To turn sideways pages the right way up first, use [Rotate PDF](https://shahid09.is-a.dev/tools/rotate-pdf/).

## Related

- [Split PDF](https://shahid09.is-a.dev/tools/split-pdf/)
- [Compress PDF](https://shahid09.is-a.dev/tools/compress-pdf/)
- [Rotate PDF](https://shahid09.is-a.dev/tools/rotate-pdf/)

## Sources

- [Wikipedia: PDF](https://en.wikipedia.org/wiki/PDF)
- [ISO 32000-2: the PDF 2.0 standard](https://www.iso.org/standard/75839.html)