ZIP is the easiest compression format to use across any device
ZIP is the standard compression format that works on Windows, Mac, and Linux without installing anything extra. When you compress files into a ZIP, you reduce their size and bundle them into a single file that you can email, upload, or store. ZIP preserves your original files — the originals stay where they are, and you get a new compressed copy.
The steps differ slightly depending on your operating system, but the result is identical: a .zip file that anyone can open without special software.
Key Takeaways
- Windows and Mac both have built-in ZIP tools in File Explorer and Finder — right-click the file or folder and select compress or create archive.
- Linux users can use the file manager's context menu or the command line tool zip for more control over what gets compressed.
- ZIP files preserve folder structure, so if you compress a folder with subfolders, the organization stays intact when someone unzips it.
- The original files remain untouched after compression — ZIP creates a new .zip file alongside them.
How to ZIP files on Windows
Open File Explorer and navigate to the file or folder you want to compress. Right-click it, then look for "Send to" in the menu. Hover over "Send to" and select "Compressed (zipped) folder". Windows creates a new .zip file in the same location with the same name plus ".zip" at the end.
If you want to compress multiple files at once, select them all first by clicking the first one, holding Ctrl, and clicking each additional file. Then right-click any of the selected files and follow the same "Send to" > "Compressed (zipped) folder" path. Windows bundles all of them into a single .zip file.
To verify the compression worked, double-click the .zip file. A new window opens showing the contents inside. You can extract everything by right-clicking the .zip file and selecting "Extract All", or you can drag individual files out of the window to copy them elsewhere.
How to ZIP files on Mac
Open Finder and locate the file or folder you want to compress. Right-click it and select "Compress" from the menu. Mac creates a new .zip file with the same name plus ".zip" at the end, placed in the same folder as the original.
To compress multiple files, select them all by clicking the first one, then holding Cmd and clicking each additional file. Right-click any of the selected files and choose "Compress". Mac creates a single .zip file containing all of them.
To open a .zip file on Mac, double-click it. Mac automatically extracts the contents and places them in the same folder. You can also right-click a .zip file and select "Open With" to choose a different process if you want to view the contents without extracting.
How to ZIP files on Linux
Most Linux file managers (like Nautilus on Ubuntu or Dolphin on Fedora) have a built-in compress option. Right-click the file or folder you want to compress and look for "Compress" or "Create Archive". Select it, choose ZIP as the format if prompted, and the file manager creates a .zip file in the same location.
If your file manager does not have a compress option, or if you want more control, use the command line. Open a terminal and navigate to the folder containing the files you want to compress. Type zip -r filename.zip foldername to compress a folder, or zip filename.zip file1 file2 file3 to compress specific files. The -r flag tells the zip command to include subfolders and their contents.
To verify the contents of a .zip file from the command line, type unzip -l filename.zip. This lists everything inside without extracting it. To extract, type unzip filename.zip.
What happens to folder structure inside a ZIP
When you compress a folder that contains subfolders, ZIP preserves the entire structure. If you have a folder called "Project" with subfolders "Images" and "Documents" inside, the .zip file will contain that same structure. When someone unzips it, they get the "Project" folder with "Images" and "Documents" inside, exactly as they were.
This matters when you are sharing work with others. If you compress a folder with a specific organization, that organization survives the compression and extraction process. The person receiving the .zip file can unzip it once and have everything in the right place.
ZIP file size and compression ratio
ZIP reduces file size by removing redundant data, but the amount of reduction depends on what you are compressing. Text files, documents, and images compress well — you might see 50 to 80 percent size reduction. Video files and photos that are already compressed (like .mp4 or .jpg) compress very little because the data is already optimized.
If you compress a folder with mixed file types, the overall .zip file will be smaller than the original folder, but not dramatically smaller if most files are already compressed formats. ZIP is still worth using because it bundles everything into one file, making it easier to email or upload, even if the size savings are modest.
Splitting large ZIP files
Most ZIP tools create a single .zip file, but if you are compressing something very large and need to split it across multiple files (for example, to fit on a USB drive with a size limit), you can use the command line on Linux or Mac. Type zip -s 100m -r filename.zip foldername to create .zip files that are each 100 megabytes. This creates filename.z01, filename.z02, and so on.
On Windows, third-party tools like 7-Zip offer splitting options, but the built-in Windows ZIP tool does not. If you need to split a large archive on Windows, consider using 7-Zip instead, which is free and handles ZIP files just as well as the built-in tool.
Frequently Asked Questions
Can I password-protect a ZIP file?
The built-in ZIP tools on Windows and Mac do not support password protection. On Linux, you can add a password using the command line: zip -e -r filename.zip foldername and enter a password when prompted. For Windows and Mac, use 7-Zip or another third-party tool if you need encryption.
What if the ZIP file is corrupted and will not open?
Try extracting it with a different tool — sometimes one process can recover a file that another cannot. On Windows, try 7-Zip. On Mac, try The Unarchiver. If the file is truly damaged, you may need the original uncompressed version. This is why keeping backups of important files is important before compressing them.
Do I need to delete the original files after creating a ZIP?
No. ZIP creates a new file and leaves the originals untouched. You can delete the originals if you want to save space, but ZIP does not do this automatically. Check that the .zip file opens correctly and contains everything before you delete anything.
Can someone on a different operating system open my ZIP file?
Yes. ZIP is universal — a .zip file created on Windows opens on Mac and Linux without any conversion or special software. This is why ZIP is the standard format for sharing files across different systems.