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WEB TOOLS

PDF Merger

Combine multiple PDF files into one PDF in the order you choose.

Your files are not uploaded to a server. All processing is performed locally in your browser.

Drop PDF files here

or

Add two or more PDFs, arrange them in the order you want, and merge them into one file.

Added PDFs

Page counts and file sizes will appear here after you add PDFs.

    Merge multiple PDFs into one

    Arrange multiple PDF files in the order you want and save them as a single PDF. Your PDF files are not uploaded to the server; merging is performed in your browser.

    How to use

    1. Add two or more PDF files.
    2. On a computer, drag files into order or use Move Earlier and Move Later.
    3. Remove any PDF you do not need.
    4. Select Merge PDFs, then download merged.pdf when processing is complete.

    About output quality

    Pages are copied into a new PDF rather than rendered as images. The merger does not intentionally downsample or recompress pages just to combine them. PDFs with different page sizes are kept at their original sizes.

    Compatibility

    Password-protected and encrypted PDFs are not supported. Digital signatures cannot remain a valid signature of the newly merged document. Document-level features such as bookmarks, attachments, and forms may not be preserved exactly as they were in the source PDFs.

    FAQ

    Are PDF files uploaded to a server?

    No. Your selected PDF files are read, copied, and merged in your browser and are not uploaded to tools.yayao.site. The PDF processing library itself is loaded from an external CDN when the tool is first used.

    Can I change the PDF order?

    Yes. Drag files to reorder them on a computer, or use Move Earlier and Move Later on any device.

    Can I merge PDFs with different page sizes?

    Yes. A4, landscape pages, and other sizes can be mixed. Each page keeps its own dimensions in the merged PDF.

    Does merging reduce PDF quality?

    The tool does not render pages as images or intentionally lower their quality. It copies the source pages into a new PDF document.

    Can I merge password-protected PDFs?

    No. Password-protected or encrypted PDFs are not supported. Remove the protection first, then add the unlocked PDF.

    What happens to digital signatures?

    Merging changes the document, so a signature on a source PDF cannot remain a valid signature of the newly merged document.

    Are there file size or file count limits?

    For browser stability, the tool limits files to 80 MB each, 240 MB total, and 30 files per session. Practical limits also depend on device memory and browser capabilities.

    Can I reorder individual pages inside a PDF?

    This tool reorders whole PDF files. Page-level reorder, deletion, and rotation are better handled by a separate PDF page organizer.