How to Work with ZIP Files

What Are ZIP Files?

ZIP files are compressed folders that:

• Combine multiple files into one
• Make files smaller for easier sharing
• Are common for downloads and email attachments

They have a .zip extension and often look like folders with a zipper.

Extracting (Opening) ZIP Files

Windows

Method 1: Right-Click Extract

• Right-click the ZIP file
• Click Extract All
• Choose where to extract
• Click Extract

Method 2: Double-Click

• Double-click the ZIP file
• You can view files inside
• Drag files out or copy them

Mac

• Double-click the ZIP file
• Contents extract to a folder automatically
• The folder appears next to the ZIP

Creating ZIP Files

Windows

• Select files you want to compress
• Right-click the selection
• Click Compress to ZIP file (or Send to > Compressed folder)
• Name the ZIP file

Mac

• Select files to compress
• Right-click (or Control-click)
• Click Compress [number] Items
• A ZIP file is created

When to Use ZIP Files

Good Uses

• Emailing multiple files at once
• Reducing file size for sharing
• Downloading software or document collections
• Archiving old files

When to Avoid

• For single files (usually unnecessary)
• When recipient might not know how to extract
• For very large files (consider cloud sharing instead)

Common Issues

Can't Open ZIP File

• May need to download completely first
• Try right-click > Extract instead of double-click
• File might be corrupted

ZIP File Is Too Large

Consider:

• Splitting into multiple ZIP files
• Using cloud sharing (OneDrive) instead
• Removing unnecessary files

Files Won't Compress Much

Some files don't compress well:

• Photos (already compressed)
• Videos (already compressed)
• PDFs (often already compressed)

Documents and text files compress very well.

Password-Protected ZIP Files

Some ZIP files require a password:

• When extracting, you'll be prompted for password
• Enter the password provided by the sender
• Files extract normally

Creating Password-Protected ZIP

Windows doesn't support this natively. You would need third-party software (ask IT if needed).

ZIP vs Other Formats

• ZIP - Most common, works everywhere
• RAR - Needs special software
• 7Z - Better compression, needs special software

For most purposes, stick with ZIP - it works on any computer.

Need Help?

For file compression questions, contact helpdesk@netlumait.com.au or call 1300 521 162.