Zipping bundles one or many files into a single, smaller archive — perfect for emailing a folder, shrinking a large file, or keeping a set of documents together. It's built into every operating system, so you don't need extra software for the basics.
This guide covers how to zip files on Windows and Mac, how to unzip them, and when a zip actually helps (and when it won't).
What you need
- ✓The files or folder you want to zip.
- ✓Nothing extra for basic zipping — it's built into Windows and Mac.
- ✓A dedicated tool (like 7-Zip) only if you want strong password protection.
Step-by-step
- 1
Zip on Windows
Select the files or folder, right-click, and choose 'Compress to ZIP file' (or 'Send to › Compressed (zipped) folder' on older Windows). A new .zip appears alongside — rename it as you like.
- 2
Zip on Mac
Select the files or folder, right-click (or Control-click), and choose 'Compress'. Mac creates 'Archive.zip' (or names it after a single item). Everything you selected is bundled into that one file.
- 3
Unzip an archive
On Windows, right-click the .zip and choose 'Extract All'. On Mac, just double-click the .zip and it extracts to the same folder. The original files come back out unchanged.
- 4
Know what compresses well
Zipping shrinks documents, text and uncompressed files a lot, but already-compressed files (JPEGs, MP4s, PDFs, MP3s) barely shrink — for those, zip is mainly about bundling many files into one, not saving space.
- 5
Password-protect if it's sensitive
The built-in tools bundle but don't strongly encrypt. For confidential files, use a tool that creates an AES-encrypted ZIP (like 7-Zip) and set a strong password so the contents are actually protected.
Examples
- Bundling 20 photos and a document into one Archive.zip so they attach to a single email instead of twenty separate files.
- A folder of text files and spreadsheets zipping down to a fraction of its size, while a folder of JPEGs barely shrinks — because photos are already compressed.
Tips
- →Zip a folder to send many files as one clean attachment.
- →Don't expect photos, videos or PDFs to shrink much — they're already compressed.
- →Use an AES-encrypted ZIP for anything confidential; plain ZIP isn't secure.
- →Rename the .zip to something meaningful before sending.
- →Recipients on any OS can open a standard .zip without special software.
Common mistakes
- Expecting big savings on media files. JPEGs, MP4s and PDFs are already compressed; zip mainly bundles them.
- Relying on plain ZIP for privacy. Use an AES-encrypted archive with a strong password for sensitive files.
- Zipping the wrong selection. Select exactly the files/folder you want first — check before you send.
- Forgetting recipients must extract it. They just double-click (Mac) or Extract All (Windows); mention it if unsure.
Conclusion
Zipping is built into every computer: select, right-click, compress. It's great for bundling many files into one and shrinking uncompressed data — just remember media files won't shrink much, and use an AES-encrypted archive when the contents need to stay private.