Merge PDF
Combine multiple PDF files into one document. Fast, free, and secure — no upload required.
✓ No registration required✓ Files processed in browser✓ Free forever✓ 100% secure
Drag & drop PDF files here
Select multiple files — max 50MB each
Ad slot — 300×250
How to Merge PDF
- 1Click "Select Files" or drag and drop your PDF files into the upload area.
- 2Arrange the files in the order you want them merged.
- 3Click "Merge PDFs" — your combined PDF will download automatically.
Frequently Asked Questions
How many PDF files can I merge at once?
You can merge up to 20 PDF files at once with FileToolBox. All processing happens in your browser — no file size limits.
Is it safe to merge PDFs online?
Yes, completely safe. Your files never leave your device — all merging is done locally in your browser. We never see your files.
Will the quality change after merging?
No. Merging preserves all content, formatting, images, fonts, and quality exactly as in the original files.
Can I merge PDFs with different page sizes?
Yes. Each page keeps its original dimensions when merging PDFs with different page sizes.
Do I need an account to merge PDFs?
No account or registration is ever required. All tools on FileToolBox are 100% free with no sign-up.