Command-line tool

zsync

brew/zsync

Checked 25 Oct 2026, 21:09 UTC · Listing refreshed from Homebrew, winget, npm, Scoop and cargo; npm packages checked against OSV.dev

File transfer program

Website Source

At a glance

Type

Command-line tool

Install on

macOS, Linux

Last checked

25 Oct 2026, 21:09 UTC

Install it

macOS

brew install zsync

Linux

brew install zsync

Download a file using a `.zsync` control file

zsync path/to/url.zsync

Use a local file as a seed to avoid re-downloading unchanged parts

zsync -i path/to/existing_file path/to/url.zsync

Save the updated file under a specific name

zsync -i path/to/existing_file -o path/to/new_file path/to/url.zsync

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