How to Decompress a File on Windows

Compressed files are everywhere — downloaded software, emailed attachments, shared project folders. Windows handles most of them natively, but the right way to decompress depends on the file format, your Windows version, and how much control you need over the process.

What "Decompressing" Actually Means

When files are compressed, an algorithm reduces their size by encoding data more efficiently. Decompressing (also called extracting) reverses that process, restoring the original files to their full size and usable state.

The most common compressed formats you'll encounter on Windows:

How to Decompress a ZIP File Using Windows Built-In Tools

Windows 10 and Windows 11 both support ZIP extraction without any additional software.

Method 1 — Right-click extract:

1. Locate the .zip file in File Explorer
2. Right-click the file
3. Select "Extract All..."
4. Choose a destination folder
5. Click Extract

Windows will decompress the contents into the folder you specified. If you skip choosing a destination, it defaults to a new folder in the same location as the ZIP file.

Method 2 — Open and drag: You can also double-click a ZIP file to open it like a folder in File Explorer, then drag individual files out. This works for previewing contents, but the files aren't fully extracted until they're copied out of the compressed view.

🗂️ A common mistake: working on files inside the ZIP window without extracting them first. Some file types will open and appear functional, but changes may not save correctly until the file is properly extracted.

Decompressing RAR, 7Z, and Other Formats

Windows has no native support for .rar or .7z files. You'll need a third-party utility. The most widely used options are:

• 7-Zip — free, open-source, supports a wide range of formats including .7z, .rar, .tar, .gz, and more
• WinRAR — proprietary software, handles .rar natively, offers a trial with continued free use
• PeaZip — free and open-source alternative with a broad format library

Once installed, these tools integrate into your right-click context menu. The process is similar to extracting a ZIP:

1. Right-click the compressed file
2. Look for the tool's menu option (e.g., "7-Zip" → "Extract Here" or "Extract to [folder name]")
3. Choose where to extract and confirm

"Extract Here" places files in the same directory as the archive. "Extract to [folder name]" creates a new subfolder — useful when the archive contains many files.

Dealing With Multi-Part Archives

Some large archives are split across multiple files — for example, archive.part1.rar, archive.part2.rar, or archive.z01, archive.zip. These are multi-volume archives, and all parts must be present and in the same folder before extraction.

Extract from the first part only — the software will automatically pull in the remaining segments. Attempting to extract from a middle or end segment typically results in an error.

Handling Password-Protected Archives 🔐

Compressed files can be encrypted with a password. When you attempt to extract, you'll be prompted to enter it. Without the correct password, the contents are inaccessible — this is by design and not a software limitation you can work around.

If you've forgotten the password to your own archive, recovery options exist but vary significantly in success depending on password complexity and the encryption method used.

Factors That Affect Your Extraction Experience

Not every decompression situation plays out the same way. Several variables shape the process:

File format — ZIP files work out of the box; anything else requires additional software. The format used affects compatibility, compression ratio, and whether encryption is supported.

Archive size — Extracting a 50 MB ZIP is nearly instant. A multi-gigabyte archive will take longer and temporarily require significant free disk space — you need enough room for both the compressed archive and the extracted output.

Compression level — Files compressed at higher levels take marginally longer to decompress, though modern processors handle this quickly for most common archive sizes.

Destination drive — Extracting to a slower drive (like an older HDD) will be noticeably slower than extracting to an SSD, particularly for archives containing thousands of small files.

Windows version — Windows 11 expanded native format support slightly compared to Windows 10. Both support ZIP natively, but features like context menu placement differ slightly between versions.

Your use case — Occasionally extracting a downloaded ZIP file is very different from regularly working with large .7z backups or automating extraction through scripts. Casual users rarely need more than Windows' built-in tool, while power users or developers may benefit from a dedicated utility's batch processing, command-line support, or finer compression controls.

A Note on TAR and GZ Files

.tar and .gz files originate from Unix/Linux environments and appear more frequently as developers share projects or servers distribute packages. Windows 10 (build 17063 and later) and Windows 11 include a built-in tar command accessible through Command Prompt or PowerShell:

tar -xf filename.tar.gz 

Third-party tools like 7-Zip also handle these formats through the graphical interface if you prefer not to use the command line.

The method that makes sense for you depends on how often you encounter these formats and your comfort level with the command line versus a point-and-click tool.