Merging PDF files means combining two or more separate PDF documents into a single file. This is useful in dozens of everyday situations: attaching a cover letter and resume as one file, combining multiple invoices for a client, assembling a multi-section report, or joining scanned pages into a single document.
The fastest way to merge PDFs online
You do not need to install any software to merge PDF files. PDFanything lets you combine as many PDFs as you need directly in your browser. The files are never uploaded to a server, which means your documents stay completely private.
- Go to pdfanything.com/merge
- Click the upload area or drag and drop your PDF files. You can add as many as you need.
- Drag the file cards to reorder them if necessary. The final PDF will follow this order.
- Click Merge PDFs. The combined file will be generated in seconds.
- Download your merged PDF.
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Free PDF Merge Tool — free, no sign-up required
Can I merge PDFs with different page sizes?
Yes. PDFanything automatically normalises page sizes when merging. If you combine an A4 document with a letter-size document, the tool scales all pages to a consistent width so the result looks uniform throughout.
How to merge a scanned document with a PDF
If you have a scanned document saved as a JPG or PNG image, you first need to convert it to PDF using the Convert Images to PDF tool. Once converted, you can add it to the merge tool alongside your other PDF files.
How to merge PDFs on a Mac without software
macOS includes a built-in way to merge PDFs using Preview, but it involves multiple steps and can be slow for large files. The easiest method on any platform, including Mac, is to use a browser-based tool like PDFanything. Open your browser, go to the merge tool, upload your files, and download the result — no software installation needed.
Is it safe to merge PDFs online?
PDFanything processes all files locally in your browser using JavaScript. Your files are never sent to any server. This means your documents remain completely private. You can verify this by checking your browser's network traffic — no file upload requests are made.