About Join Files
Joining files concatenates their bytes: the output is the first file followed immediately by the second, and so on. That is the correct way to rebuild a file that was split into numbered parts, and it also works for formats that are valid when appended, such as plain text, CSV without repeated headers, and MPEG transport streams. It does not merge documents such as PDF or Word files, which need a format-aware tool.
How to use Join Files
- Choose the files to join, or drag them onto the upload area. Files are sorted by name when added.
- Check the order in the list and use "Move up" to change it.
- Type a name for the combined file.
- Press "Join and download" to save the result.
Questions about Join Files
Can I use this to merge PDF or video files?
Not in general. Formats such as PDF, MP4, and DOCX have internal structure, so appending bytes produces a file that opens only the first part or not at all. Use a dedicated merge tool for those formats.
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