When to merge PDFs
Use Merge PDF when separate PDF files need to become one ordered document, such as combining scanned pages, receipts, invoices, or downloaded forms. Select two or more PDFs, arrange them in the order you want, and download a single merged PDF. The tool copies pages into a new file and does not require an account or a server upload.
Input, output, and ordering
The output keeps the page order shown in the file list. Move files before running the tool if the first document should appear later, or remove files that should not be included. Keep original copies because the downloaded merged file is a new result, not a replacement for the source PDFs.
Privacy and limits
PDF merging runs in the browser with local PDF libraries. 100PDF does not collect document contents, filenames, or passwords for supported tools. Very large PDFs, damaged files, or encrypted files can fail in the browser, so review the downloaded PDF before sharing or archiving it.