Add at least 2 PDF files to merge
Merge PDF Files Online — Free, Private & Instant
Combining multiple PDF files into one document is one of the most common everyday tasks for students, researchers and professionals — and one of the most frustrating when the tools available require logins, charge fees or upload your files to a remote server. Our free online PDF merger does none of those things. Every file stays entirely on your device. Drag in your PDFs, reorder them, and click Merge — your combined document downloads in seconds, with no account, no software and no wait.
Simple Mode gives you the full core experience: unlimited file reordering via drag-and-drop, support for up to 50 PDFs per merge, and instant download. Switch to Pro Mode (free) for per-file page ranges, five page order presets, blank page insertion, page number stamping, custom output filenames and PDF metadata editing — everything you need for professional document production.
Why browser-based PDF merging is safer than upload-based tools: When you upload a PDF to an online merging service, that file exists on a third-party server — even if only temporarily. Your contract, your dissertation draft, your financial statement or your patient record is now outside your control. Our tool processes everything locally using the open-source pdf-lib library. The file never leaves your browser. There is nothing to delete because nothing was ever stored.
Six Situations Where You Need to Merge PDFs
Simple vs Pro — What Each Mode Includes
| Feature | ⬜ Simple Mode | ⭐ Pro Mode (Free) |
|---|---|---|
| Drag & drop file upload | ✓ | ✓ |
| Up to 50 PDF files | ✓ | ✓ |
| Drag-to-reorder files | ✓ | ✓ |
| Move up / down buttons | ✓ | ✓ |
| Instant download | ✓ | ✓ |
| Max file size per PDF | 20 MB | 50 MB |
| Per-file page ranges | — | ✓ |
| Page order presets (5 options) | — | ✓ |
| Blank pages between files | — | ✓ |
| Custom output filename | — | ✓ |
| PDF metadata (title, author) | — | ✓ |
| Page number stamping | — | ✓ |
| Stats panel (files, pages, size) | — | ✓ |
| Merge order summary | — | ✓ |
Pro Mode — Eight Advanced Merge Features
1-3,5,8-10 — so only the pages you specify are included from that file. Mix ranges from different files in a single merge.How to Merge PDFs — Step by Step
For more PDF tools, use our PDF Splitter to break a large PDF into separate pages or sections, our PDF Compressor to reduce file size before merging, our Add Page Numbers tool to stamp numbered pages on any existing PDF, and our PDF Studio for the full suite of 30+ browser-based PDF tools.
Frequently Asked Questions
Merging PDFs, file safety and Pro Mode features
Drag your PDF files onto the drop zone, reorder them by dragging the cards, then click Merge PDFs. Your combined file downloads immediately. No account, no upload, no software. Everything runs in your browser — completely free.
Yes — your files never leave your device. All merging happens locally in your browser using the open-source pdf-lib library. No PDF is uploaded to any server or stored anywhere. You can disconnect from the internet after loading the page and the tool still works perfectly.
Simple Mode: 20MB per file. Pro Mode (free): 50MB per file. Up to 50 files per merge in both modes. For very large PDFs, use the Compress PDF tool first to reduce each file's size before merging.
Yes — in Pro Mode, each file has a page range input. Enter ranges like 1-3,5,8-10 to include only those pages from that specific file. Different files can have different page ranges in the same merge operation.
Yes — drag the file cards into any order before merging. In Pro Mode, you can also apply page order presets: normal, reverse all pages, odd pages only, even pages only, or reverse each file's pages individually.
No — the tool merges at the document structure level, not by re-rendering pages. Images, fonts, vector graphics and text are preserved exactly at their original quality. Quality is only affected if you explicitly enable the optional compression setting in Pro Mode.
Yes — in Pro Mode, tick "Add page numbers to merged PDF" before clicking Merge. Choose from four positions: bottom centre, bottom right, top centre or top right. Numbers appear as "Page X of Y" in small grey text on every page.
Pro Mode (free, no account needed) adds: per-file page ranges, 5 page order presets, blank page insertion between files, custom output filename, PDF metadata editing (title and author), page number stamping with 4 positions, a live stats panel (files, pages, total size) and a merge order summary showing the exact sequence before you merge.