Merge PDF Free

Combine multiple PDFs into one, split by page range, or reorder and delete pages — all without uploading a single file. Works entirely in your browser.

Files never leave your device.
No uploads No watermark No size limit Works offline
Drop PDF files here
or click to select files · up to 20 recommended
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How to Merge PDF Files

  1. Drop or select your PDFs. Drag files from your desktop into the drop zone, or click "Choose Files". You can add as many PDFs as your browser can hold in memory.
  2. Arrange the order. Drag file rows up and down, or use the ↑↓ buttons. The merged PDF will follow this exact order.
  3. Name your output. Edit the filename field if you want a custom name — the default is merged.pdf.
  4. Click Merge PDFs. Processing happens locally on your CPU. Large or image-heavy files may take 10–30 seconds. A progress bar keeps you informed.
  5. Download. Your browser downloads the merged PDF automatically. No login, no email required.

How to Split a PDF by Page Range

  1. Click the Split tab above the tool.
  2. Drop or select the PDF you want to split.
  3. In the "Page range" field, type the pages you want. Examples: 1-3 extracts pages 1, 2, and 3. 1-3, 5, 8-10 extracts pages 1, 2, 3, 5, 8, 9, 10. Page numbers start at 1.
  4. Or check "Split every page" to download each page individually.
  5. Click Extract Pages to download your new PDF.

How to Reorder or Delete PDF Pages

  1. Click the Reorder / Delete tab.
  2. Load a single PDF file.
  3. Use ↑/↓ buttons to move pages up or down. Press the × button to toggle a page for deletion (it will appear crossed out). You can un-toggle it before saving.
  4. Click Save PDF to download your rearranged PDF with deleted pages removed.

Why Use a Browser-Only PDF Tool?

100% Private

Your tax returns, contracts, medical records, and ID documents stay on your device. Nothing touches a server — ever.

No Account Needed

Skip the sign-up form. Open the page, drop your files, merge them, done. Zero friction.

No Watermark

The output is a clean PDF. No "Processed by XYZ" banner, no promotional page, no visual noise.

No File-Size Limit

The only cap is your browser's available RAM. For most users that means hundreds of MB of PDFs merge without issue.

Works Offline

Once the page is loaded, you can disconnect from the internet. The pdf-lib library runs entirely client-side.

Free Forever

No trial, no premium tier, no credit card. This tool runs on ads — you get full functionality for free.

PDF Merging Best Practices

Getting the best results from a PDF merge involves more than just clicking a button. Here are practical tips that save time and prevent common mistakes:

  • Check page orientation before merging. If one document is landscape and another is portrait, the merged PDF will have mixed orientations — which is usually fine, but worth verifying before sending to a printer.
  • Confirm page count per file. Each file row shows its page count. Make sure a 12-page contract shows 12 before you merge a dozen contracts into one report.
  • Order matters. The merge output follows the list order exactly. Drag files into the correct sequence before clicking Merge.
  • Large files are slower. A 30 MB scanned document will take noticeably longer than a 200 KB text PDF. Process heavy files with a charged laptop, not on low battery.
  • pdf-lib preserves document content, not interactive features. Form fields, digital signatures, and JavaScript actions are preserved as static content in many cases, but highly complex interactive forms may lose their interactivity. For archival merges (combining scanned statements, contracts, etc.), the output is always correct.
  • Splitting tip: count from 1. Page numbers in this tool are 1-indexed — page 1 is the first page of the document, matching how you'd refer to pages in conversation.

Frequently Asked Questions

Are my PDF files uploaded to a server?
No. All PDF processing happens entirely in your browser using JavaScript. Your files are never sent to any server, never stored in the cloud, and never seen by anyone but you. Once you close the tab, nothing is retained.
How many PDF files can I merge at once?
There is no hard limit imposed by this tool. The practical ceiling is your device's available RAM — browser memory is the real constraint. You'll see a warning if you add more than 20 files, but you can proceed. Very large PDFs (100 MB+) may be slow to process.
How do I split a PDF by page range?
Switch to Split mode, load your PDF, then type a page range in the range field. Use commas to separate ranges: for example, "1-3, 5, 8-10" extracts pages 1, 2, 3, 5, 8, 9, and 10 into a new PDF. You can also check "Split every page" to download each page as its own file.
Can I merge password-protected PDFs?
Not currently. If you add a password-protected PDF, it will show a clear error message and be skipped during merge. The other files in your list will still process normally. Password entry support is planned for a future update.
Does this tool add a watermark to merged PDFs?
No. The output PDF is a clean merge of your input files with zero added text, logos, or watermarks of any kind. What goes in is what comes out.
What browsers are supported?
Any modern browser: Chrome, Firefox, Safari, and Edge on both desktop and mobile. The tool uses standard Web APIs (File API, Blob URLs) and the pdf-lib JavaScript library, which work across all current browsers. Internet Explorer is not supported.
Why does merging take a while on large files?
PDF processing happens on your device's CPU rather than a fast server. Larger and more complex PDFs (especially those with embedded images or fonts) take more time to decode and re-encode. A 10 MB, 50-page PDF typically takes 5–15 seconds. Progress is shown so you know the tool is working.
Can I reorder pages inside a single PDF?
Yes. Use Reorder mode: load one PDF, then use the up/down buttons to rearrange pages, and press × to remove pages you don't need. Click Save PDF to download the rearranged document.