How to Merge PDF Files

Merging PDF files combines several documents into one, in the order you select them. IXPDF's Merge PDF tool takes two or more PDFs and produces a single file where the first selected PDF becomes the first pages, the second comes next, and so on. All processing happens locally in your browser — your files never leave your device.

Steps

1. Open the Merge PDF tool at/tools/merge-pdf/. You will see a multi-file dropzone and a Run Merge PDF button.
2. Select two or more PDFs. Drag your files onto the dropzone, or click to choose them. The tool requires at least two files. A summary line shows how many files are selected and their total size.
3. Run merge. Click Run Merge PDF. The button showsProcessing… while the worker combines the files. The first file you selected becomes the first pages of the output.
4. Download. Click Download result to save the merged PDF. Use Process another file to start over.

Tips

• Order matters. The first file you add becomes the first pages of the result, so add files in the order you want them to appear.
• After merging, check the page count of the result against the sum of the inputs to confirm nothing was dropped.
• Merging is a good time to compress the combined file afterward, since one optimized file is easier to share than several.
• If you only need part of a document in the merge, split or extract the pages you want first, then merge the trimmed results.

Common mistakes

• Wrong order. Because the first selected file leads the output, picking files in the wrong order puts chapters out of sequence. Re-add them in the right order.
• Trying to merge a single file. The button stays disabled until at least two PDFs are selected — merge needs something to combine.
• Encrypted PDFs. Password-protected files cannot be read to merge. Unlock them first, then merge the unlocked copies.