or click to browse — select multiple files
Before merging, take a moment to name your files clearly so you can arrange them in the correct order easily. If your PDFs have different page sizes (for example, mixing letter and A4), the merged file will preserve each page at its original dimensions. For large merges involving dozens of files, close unused browser tabs to ensure your device has enough memory. After merging, you can use our Compress PDF tool to reduce the combined file size if needed, which is especially helpful when emailing the final document or uploading it to a portal with size restrictions.
Yes, you can add as many PDF files as you need and merge them all into a single document. There is no file count limit. Simply drag and drop all your files into the upload area, reorder them as needed, and click merge.
Absolutely. All PDF merging happens locally in your browser using pdf-lib. No files are uploaded to any server, and your documents never leave your device. This makes it safe for confidential business documents, legal contracts, and personal records.
Yes, all pages maintain their original formatting, images, fonts, and layout in the merged document. The tool copies pages directly from the source PDFs without re-rendering, so nothing is altered or degraded during the merge process.
Yes. After adding your PDF files, they appear in a list that you can reorder before merging. This lets you arrange chapters, sections, or documents in the exact sequence you want. You can also remove individual files from the list if you change your mind.
There is no server-imposed limit since all processing happens in your browser. The practical limit depends on your device's available memory. Most modern devices can handle merging PDFs totaling several hundred megabytes without issues. For very large files, close other browser tabs to free up memory.