This PDF merger processes everything locally in your browser. Simply upload your PDF files, arrange them in the desired order, and click "Merge PDFs". The tool uses the pdf-lib library to combine all pages from each PDF into a single document. No files are ever uploaded to any server, ensuring complete privacy and security.

Yes, absolutely. This tool operates 100% client-side. Your PDF files remain on your device and are processed entirely within your browser's memory. We do not upload, store, or transmit your files anywhere. You can even disconnect from the internet after the page loads and the tool will still work perfectly.

There is no hard limit on file sizes since processing happens locally. However, very large PDFs (over 200MB each or combined over 500MB) may cause browser performance issues depending on your device's memory. For optimal performance, we recommend keeping individual files under 100MB and total combined size under 300MB.

Currently, password-protected (encrypted) PDFs cannot be merged directly. You would need to remove the password protection first using a dedicated tool, then upload the unlocked PDFs here for merging. This limitation exists because the pdf-lib library does not support decryption of encrypted PDFs.

No, the merging process is lossless. All pages, images, text, fonts, and formatting are preserved exactly as they appear in the original PDFs. The tool copies page content directly without re-compressing or altering quality in any way. The merged PDF will maintain the same visual fidelity as the source files.

Yes! You can drag and drop files in the list to reorder them, or use the up/down arrow buttons next to each file. The files are merged in the order they appear in the list (top to bottom). On mobile devices, the arrow buttons provide an easy way to reorder without drag-and-drop.

You can merge as many PDFs as you need in a single operation. There is no artificial limit on the number of files. However, merging a very large number of files (50+) may slow down processing. For most use cases, merging 2-20 PDFs works quickly and smoothly.

Your files remain only in your browser's memory during the session. Once you close the tab or navigate away, all file data is automatically cleared. The merged PDF is downloaded directly to your device. No residual data is stored anywhere. For added peace of mind, you can click "Clear All" to manually remove files from the list.

Absolutely! This PDF merger is fully responsive and mobile-friendly. You can upload PDFs from your phone's storage, reorder them using the arrow buttons, and merge them directly on your mobile device. The tool works on iOS Safari, Android Chrome, and all modern mobile browsers.

When merging PDFs, page content is preserved but document-level features like bookmarks (outlines), internal hyperlinks between pages, and form fields may not carry over perfectly. The merged PDF will contain all pages in sequence, but cross-document references and interactive elements may need to be re-established using a PDF editor.

Yes, this tool is 100% free with no hidden costs, no registration required, and no usage limits. You can merge as many PDFs as you want, as often as you need. There are no watermarks added, no paywalls, and no premium tiers. It's a completely free online PDF merger.

Merging combines multiple PDF files into a single document while preserving original quality. Compressing reduces the file size of a PDF by optimizing images and removing redundant data, which may slightly reduce quality. This tool focuses on merging; if you need compression, you would use a separate PDF compression tool after merging.