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Merge PDF Files
Combine multiple PDF documents into a single file. Drag to reorder, sort alphabetically, then merge — instantly and privately in your browser.
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🔒 Your files stay on your device
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Combine multiple PDF documents into a single file. Drag to reorder, sort alphabetically, then merge — instantly and privately in your browser.
Click the upload button or drag and drop multiple PDF files into the drop zone. There is no limit on how many files you can add.
Drag files up or down to set the page order. Use the A→Z button to sort alphabetically. Remove any file you don't need.
Click the Merge button. Your combined PDF is ready to download in seconds — processed entirely on your device.
Most PDF merging tools require you to upload your files to a remote server. That means your private documents — contracts, financial records, medical forms, legal paperwork — travel across the internet and sit on someone else's infrastructure, even if only temporarily. PDFably eliminates that risk entirely.
Every file you process with PDFably stays on your device. Our merge tool uses pdf-lib, a powerful JavaScript library that runs natively in your web browser. When you click "Merge," the processing happens right there on your computer or phone — not on a cloud server thousands of miles away.
This architecture gives you three practical advantages. First, privacy: no one can intercept, access, or store your documents. Second, speed: there's no upload or download wait time — merging happens instantly regardless of your internet speed. Third, freedom: there are no file size limits, no daily caps, and no premium upsells for basic functionality.
PDFably works on any modern browser across all platforms — Windows, Mac, Linux, iOS, and Android. Whether you're combining a two-page form or merging a hundred-page report, the tool adapts to your needs without requiring any software installation.
Professionals regularly need to combine multiple documents into a single PDF. Accountants merge invoices and receipts for expense reports. Lawyers combine contract pages with appendices and signature sheets. Real estate agents bundle property listings, disclosures, and inspection reports into one file for clients.
Students and researchers frequently merge individual chapter PDFs into complete documents, combine multiple reference papers into a single reading file, or merge scanned handwritten notes with digital materials.
For everyday personal use, merging PDFs helps organize tax documents, combine travel itineraries into one printable file, or create unified photo albums from separate image-to-PDF conversions.
Yes. PDFably uses client-side JavaScript to merge PDFs directly in your browser. Your files are never uploaded to any server, making it the safest way to combine PDF documents online.
There is no limit. You can merge as many PDF files as your device can handle. PDFably processes everything locally, so there are no server-imposed restrictions on file count or total size.
No account or registration is needed. PDFably is completely free to use — just upload your files and merge them instantly.
Yes. After uploading your PDFs, you can drag and drop files to change their order. You can also sort them alphabetically with one click using the A→Z button.
Nothing — because your files never leave your device. All processing happens in your browser. Once you close the page, everything is gone. No data is stored anywhere.
No. PDFably copies pages from your source files without any re-encoding or compression. The output file preserves the exact quality of your original documents.
PDFably can merge most PDFs, including those with basic protection. However, if a PDF requires a password to open, you will need to unlock it first using our Unlock PDF tool.