How do I rejoin the parts?

Use the File Joiner tool to concatenate the .part files back in order.

Are my files uploaded?

No, splitting happens entirely in your browser.

Pick a part size under your transfer limit (e.g. email or chat attachment caps).

Drop a file and split it into fixed-size .part chunks you can rejoin later. Runs entirely in your browser.

Part size (MB)

Drop a file to splitProcessed in your browser — never uploaded.