PDF

PDF Merge & Split

Merge multiple PDFs into one, split pages, or rotate - all processed locally in your browser

Free: up to 10 MB per file, 1 file at a time. Pro unlocks 100 MB files and batch merge up to 20 →

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Supports multiple PDF files

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What is PDF Merge & Split?

Merge PDF files online for free or split a PDF into separate pages - all without uploading anything to a server.

Unlike most PDF tools that send your documents to remote servers for processing, this tool runs entirely in your browser using the pdf-lib library. Your PDFs never leave your device, making it safe for contracts, invoices, tax forms, and any confidential documents. Upload multiple files and drag to rearrange the order for merging, or select specific page ranges to extract when splitting. The output downloads as a standard PDF that works everywhere. No signup, no watermarks, no file size tricks - just a straightforward PDF merger and splitter that respects your privacy.

How to Use PDF Merge & Split

1Choose the 'Merge' tab to combine multiple PDFs into one file, or the 'Split' tab to extract specific pages from a single PDF
2Upload your PDF file(s) by clicking the upload area or dragging and dropping them into the browser
3For merging, drag the files into your preferred order and click 'Merge PDFs' to download the combined document
4For splitting, enter the page ranges you want to extract (e.g., '1-3, 5, 7-10') and click 'Split PDF' to download each range as a separate file

Frequently Asked Questions

Select the 'Merge' tab, upload two or more PDF files, drag to reorder them if needed, and click 'Merge PDFs'. The combined document will download automatically. All processing happens in your browser - your files are never sent to any server.

Yes. Select the 'Split' tab, upload your PDF, and enter the page ranges you want to extract (e.g., '1-3, 5, 7-10'). Click 'Split PDF' and each range will be downloaded as a separate file.

No. All PDF processing uses the pdf-lib JavaScript library running entirely in your browser. Your files are never transmitted over the internet, making this tool safe for confidential documents like contracts, tax returns, and legal paperwork.

Since processing happens in your browser, the limit depends on your device's available memory. Most modern devices can handle PDFs up to 50-100MB without issues. For very large files, processing may take a few extra seconds.

Yes. This tool lets you merge and split PDFs for free without installing software or creating an account. Unlike Adobe Acrobat, there is no subscription, no trial period, and no watermarks added to your documents.

Yes. Because the tool runs entirely in your browser, it works on any device with a modern browser - including iPhones, Android phones, and tablets. Just open the page, upload your PDFs, and merge or split them directly on your phone.

Most online PDF mergers upload your files to their servers for processing, which means your documents pass through third-party infrastructure. ToolBox processes everything client-side in your browser using JavaScript. Your PDFs never leave your device, so there is zero risk of data exposure.

No. The pdf-lib library performs a lossless merge - it combines the PDF page structures without re-encoding or compressing the content. The merged output is identical in quality to the original files.

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What is PDF Merge & Split?

Merge PDF files online for free or split a PDF into separate pages - all without uploading anything to a server.

How to Use PDF Merge & Split

1Choose the 'Merge' tab to combine multiple PDFs into one file, or the 'Split' tab to extract specific pages from a single PDF

2Upload your PDF file(s) by clicking the upload area or dragging and dropping them into the browser

3For merging, drag the files into your preferred order and click 'Merge PDFs' to download the combined document

4For splitting, enter the page ranges you want to extract (e.g., '1-3, 5, 7-10') and click 'Split PDF' to download each range as a separate file

Frequently Asked Questions

Yes. Select the 'Split' tab, upload your PDF, and enter the page ranges you want to extract (e.g., '1-3, 5, 7-10'). Click 'Split PDF' and each range will be downloaded as a separate file.