How to Extract Files from a SEA (Self-Extracting) Archive on macOS
SEA (Self-Extracting Archive) files were common in the classic Mac OS era. They bundle the archive data with extraction code, so the recipient didn't need separate decompression software. Modern macOS cannot run classic SEA files, but tools like MacPacker can extract their contents.
The default way to open SEA files on macOS
Tool: The Unarchiver or MacPacker (third-party)
Steps
- Install MacPacker or The Unarchiver.
- Open the .sea file with the chosen application.
- The contents are extracted to a folder.
Extract individual files from a SEA archive
The default macOS tools extract everything — there's no way to pick individual files. MacPacker lets you browse SEA archive contents, preview files, and extract only what you need — without unpacking the entire archive.
A better way: open SEA files with MacPacker
MacPacker is a free, open-source macOS archive manager that supports SEA and 30+ other formats. Unlike the default tools, MacPacker lets you:
- Browse archive contents like a folder
- Preview files with Quick Look without extracting
- Extract individual files via drag and drop
- Navigate nested archives (archives within archives)
- Enjoy a native SwiftUI interface that feels right at home on macOS
Get MacPacker
v0.15.1 · macOS 14+$ brew install --cask macpackerApp Store updates may lag a few days behind direct downloads due to Apple review.
Frequently asked questions
How do I open a SEA file on modern macOS?
Modern macOS cannot run classic self-extracting archives. Use MacPacker to open .sea files as regular archives — browse the contents and extract what you need.