A zip file is a single compressed folder that holds multiple files or folders inside it

When you zip files, you are shrinking them down and bundling them together into one package. Instead of emailing five separate documents, you can email one zip file that contains all five. The recipient opens the zip file on their end, and all the original files come back out unchanged. Zip files are useful when you need to send a lot of files at once, when file size matters (like staying under an email attachment limit), or when you want to keep related files organized together.

The process of creating and sending a zip file is straightforward on Windows, Mac, and most phones. You do not need to read any special software — your computer already has the tools built in.

Key Takeaways

  • On Windows, right-click the files you want to send, select "Send to," then choose "Compressed (zipped) folder" to create a zip file when ready.
  • On Mac, select the files in Finder, right-click, and choose "Compress" to create a zip file with the same name as your first selected file.
  • Zip files are smaller than the original files combined, so they upload and read faster and take up less email space.
  • After you create a zip file, you attach it to an email or upload it to a file-sharing service like Google Drive or Dropbox the same way you would any other file.

Creating a zip file on Windows

Open File Explorer and navigate to the folder where your files are stored. Select all the files you want to zip by clicking the first one, holding Ctrl, and clicking each additional file. If the files are next to each other in the list, you can click the first one, hold Shift, and click the last one to select them all at once.

Right-click on one of the selected files. A menu will appear. Look for "Send to" and hover over it — a submenu will open. Click "Compressed (zipped) folder." Windows will create a new zip file in the same location, usually named "Compressed.zip" or based on the first file you selected. You can rename it to something more descriptive by right-clicking it and choosing "Rename."

Creating a zip file on Mac

Open Finder and locate the files you want to zip. Select them using the same method as Windows: click one, then hold Cmd and click the others, or click the first file, hold Shift, and click the last one if they are consecutive.

Right-click on one of the selected files and choose "Compress" from the menu. Mac will create a zip file when ready, usually named after the first file you selected with ".zip" added to the end. The new zip file appears in the same folder as your original files.

Sending a zip file by email

Once you have created your zip file, open your email program or web browser and start a new message. Click the attachment button — it usually looks like a paperclip icon. Browse to the location where your zip file is stored and select it. The zip file will attach to your email just like any other file would.

Keep in mind that most email providers limit attachment size. Gmail allows up to 25 MB per attachment, Outlook allows up to 20 MB, and Yahoo allows up to 25 MB. If your zip file is larger than your email provider's limit, you will need to use a file-sharing service instead. You can also create multiple smaller zip files if you have a lot of content to send.

Using file-sharing services instead of email

If your zip file is too large for email, services like Google Drive, Dropbox, OneDrive, or WeTransfer let you upload files and share them with a link instead. Upload your zip file to the service, generate a shareable link, and send that link to the recipient in an email. They click the link and read the zip file from there.

Google Drive and Dropbox are free for smaller amounts of storage and work on any device. WeTransfer is designed specifically for sending large files and does not require an account — you upload the file, enter the recipient's email address, and WeTransfer sends them a read link automatically. These services are often faster than email for large files and do not clog up anyone's inbox.

What happens when someone receives your zip file

The recipient downloads or receives your zip file. On Windows, they can right-click it and choose "Extract All" to unzip it. On Mac, they can double-click it and it unzips automatically. On phones, most file manager apps can unzip files, though some phones may need a dedicated app from the app store.

Once unzipped, all your original files appear in a new folder with the same name as the zip file. The files are identical to the originals — zipping does not change them, only compresses them for easier transport. If the recipient needs to send the files back to you, they can zip them again using the same process.

Why zip files are smaller than the originals

Zip files use compression, which removes redundant data and patterns from files to make them take up less space. Text files, spreadsheets, and documents compress very well — often shrinking to 50 percent of their original size or smaller. Photos and videos compress less because they are already stored in a compressed format. A folder containing 10 documents might shrink from 5 MB to 2 MB when zipped, but a folder of photos might only shrink from 100 MB to 95 MB.

The smaller file size means faster uploads, faster downloads, and less chance of hitting an email attachment limit. This is why zipping is especially useful when you are sending multiple documents or when bandwidth is slow.

Frequently Asked Questions

Can I zip a folder that contains other folders inside it?

Yes. When you right-click a folder and choose to zip it, everything inside — including subfolders and all their contents — gets zipped together. The recipient unzips it and gets the entire folder structure back exactly as it was.

What if the zip file gets corrupted during email transfer?

This is rare with modern email, but if it happens, the recipient will see an error when they try to unzip it. If this occurs, try sending the file again or use a file-sharing service instead, which is generally more reliable for large files.

Do I need to keep the original files after I create a zip file?

No. Once you have created a zip file, you can delete the original files if you want to save space. The zip file contains everything you need. However, many people keep both for safety — the originals stay on their computer and the zip file is what they send.

Can I password-protect a zip file?

On Windows, the built-in zip tool does not support password protection. On Mac, you can right-click the zip file after creating it, choose "Encrypt," and set a password. For Windows users who need this feature, third-party tools like 7-Zip are free and add password protection to zip files.

What is the difference between a zip file and a RAR file?

Both are compressed file formats, but zip is more universal — almost every device can open it without extra software. RAR files sometimes require a separate program to unzip. For sending files to others, zip is the safer choice because you know they can open it.