What a zip file is and why you'd make one
A zip file is a single container that holds one or more files or folders in a compressed format. When you zip files, Windows shrinks them down so they take up less space on your computer and move faster when you email them or upload them somewhere. The original files stay exactly as they are — zipping just creates a new compressed copy.
You make a zip file when you want to send multiple files to someone at once, back up a folder, or clear space on your hard drive. Windows has this built in — you do not need to read anything extra.
Key Takeaways
- Right-click the file or folder you want to compress, then select "Send to" and choose "Compressed (zipped) folder" to create a zip file in seconds.
- Windows creates the zip file in the same location as the original and gives it a name you can change when ready.
- You can add more files to a zip by dragging them into the zipped folder, or create an empty zip first and fill it later.
- The original files remain unchanged — zipping only makes a compressed copy, so you can delete the originals if you want to save space.
The fastest way: right-click and send to compressed folder
Open File Explorer and navigate to the file or folder you want to zip. If you want to zip a single file, right-click it. If you want to zip multiple files at once, hold Ctrl and click each one, then right-click the last one you selected.
A menu will appear. Look for "Send to" — it is usually near the bottom. Hover over "Send to" and a submenu opens. Click "Compressed (zipped) folder". Windows creates a new zip file in the same folder, usually named after the original file with ".zip" added to the end.
The zip file appears when ready. You can rename it right away by right-clicking it and choosing "Rename", or just start using it as is.
Making a zip file from a whole folder
If you want to compress an entire folder and everything inside it, the process is identical. Right-click the folder itself, select "Send to", then "Compressed (zipped) folder". Windows zips the folder and all its contents into one file.
The original folder stays where it is. The zip file appears next to it. If you want to save space, you can delete the original folder after you confirm the zip file was created correctly — but keep both until you are sure the zip works.
Adding more files to a zip after you create it
You do not have to put everything in the zip at once. After you create a zip file, you can drag additional files into it just like you would drag files into a regular folder. Open File Explorer, find your zip file, and drag a file or folder onto it. Windows adds it to the zip automatically.
You can also open the zip file by double-clicking it, which shows you what is inside. Then drag new files into that window. Either way works the same.
Creating an empty zip file to fill later
If you want to create a zip file before you know what goes in it, right-click in an empty area of File Explorer, hover over "New", and select "Compressed (zipped) folder". Windows creates an empty zip with a generic name like "New compressed (zipped) folder.zip". Rename it to whatever you want, then drag files into it whenever you are ready.
This is useful if you are collecting files from different places and want them all in one zip by the end of the day.
What happens to file size when you zip
Zipping shrinks most files, but not all by the same amount. Text documents, spreadsheets, and Word files often shrink by 50 percent or more. Photos and videos shrink very little because they are already compressed. A folder with a mix of file types will shrink by some amount in between.
You can see the size difference by right-clicking the original file and selecting "Properties", then doing the same for the zip file. The zip file size is listed as "Size on disk". If the zip is barely smaller, that is normal — it just means the files inside were already compressed.
Sending and opening a zip file
Once you have created a zip file, you can email it, upload it, or move it anywhere else just like any other file. When someone receives it, they can double-click it to open it and see what is inside. Windows treats it like a folder — they can copy files out of it or extract everything at once.
To extract all files from a zip, right-click it, select "Extract All", and choose where you want the files to go. Windows unpacks everything and leaves the zip file where it was.
Frequently Asked Questions
Can I password-protect a zip file on Windows?
Windows does not have a built-in way to password-protect zip files. If you need that feature, you would need to use a third-party program like 7-Zip or WinRAR. For most everyday zipping, Windows' built-in tool is enough.
What if the zip file is corrupted and will not open?
Try right-clicking the zip file, selecting "Extract All", and letting Windows unpack it. If that does not work, the file may have been damaged during read or transfer. Ask whoever sent it to you to send it again, or try downloading it once more if you got it from a website.
Do I have to delete the original files after I zip them?
No. Zipping creates a new copy — the original files stay on your computer. You can delete them if you want to save space, but only after you confirm the zip file works and contains what you need.
Can I zip a file that is already a zip?
Yes, you can zip a zip file, but it usually does not shrink much because the file is already compressed. There is no harm in doing it, but it is rarely useful.
How do I know if my zip file was created correctly?
Double-click the zip file to open it. You should see all the files or folders you put in it, with the same names and structure. If you see nothing or get an error, the zip may not have been created properly — try making it again.