A free file compressor bundles files into one smaller archive, such as a ZIP or 7z, and opens archives other people send you. Simple tools suit everyday zipping and unzipping, while specialist archivers add stronger compression and passwords. Check what your computer already handles, because you may need less extra software than you think.
Compressed files are one of those things you only think about when one won't open. A client sends a RAR file, a supplier sends a 7z, and suddenly you need a tool you've never heard of.
Here are ten free file compression tools in no particular order, sorted alphabetically, from tiny Mac apps to powerful Windows archivers. Each description comes from the tool's own website, re-checked today. If you send lots of attachments, my post on making your business mail system more efficient is a handy companion.
Remember that compression helps most with documents and text. Photos, videos and music are usually compressed already, so zipping them barely changes the size. The real benefit for those is tidiness: one archive is easier to send, download and keep track of than forty separate files.
Free file compressors side by side
In the free plan column, Yes means the tool's own site describes a free version or free plan, Trial only means a time-limited trial, and No means neither is stated. Free versions often come with limits, so check what's included before you rely on one.
| Tool | Type | Good for | Free plan |
|---|---|---|---|
| 7-Zip | Open-source file archiver | Strong compression on Windows | Yes |
| Ark | KDE archive manager | Archives on Linux desktops | Yes |
| Ashampoo ZIP Free | Windows archiver | Everyday zipping with a clean layout | Yes |
| B1 Free Archiver | Online and desktop archiver | Opening archives in the browser | Yes |
| Bandizip | Windows and Mac archiver | Fast compression with previews | Yes |
| IZArc | Windows archive tool | Business and personal archiving | Yes |
| Keka | Mac file archiver | Creating archives on a Mac | Yes |
| NanaZip | Modern Windows archiver | Right-click menus on Windows 11 | Yes |
| PeaZip | Open-source archiver | Encryption and many formats | Yes |
| The Unarchiver | Mac unarchiving app | Opening odd formats on Mac | Yes |
Ten free file compression tools to try
7-Zip
Best for: Windows users who want high compression and support for lots of archive formats.
Ark
Best for: Linux users who want a simple archive tool built into their desktop.
Ashampoo ZIP Free
Best for: Windows users who want a free archiver with a tidy interface for everyday jobs.
B1 Free Archiver
Best for: People who want to open a RAR or ZIP online without installing anything.
Bandizip
Best for: Users who want a quick archiver that can preview files inside an archive before extracting.
IZArc
Best for: Windows users who want a free archiver that's free for personal and commercial use.
Keka
Best for: Mac users who want to create 7z and ZIP files with passwords by dragging files onto an app.
NanaZip
Best for: Windows 11 users who want a modern archiver that fits the new right-click menu.
PeaZip
Best for: People who want an open-source archiver with strong encryption on Windows, Mac or Linux.
The Unarchiver
Best for: Mac users who receive archives in unusual formats and just need to open them.
Windows can now open more archive types by itself
Here's something many people haven't noticed. Microsoft's support page on zipping and unzipping files says Windows 11, version 24H2, supports ZIP, RAR, 7z and TAR archive formats. If you're on that version, you may be able to open a RAR file without installing anything at all.
A dedicated archiver still earns its place if you create a lot of archives, need passwords or work with older computers. But check what's built in before you download another app.
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What to check in a free file compressor
- Formats: does it open ZIP, RAR, 7z and TAR?
- Passwords: can you protect archives with strong encryption?
- Splitting: can you split a large archive into smaller parts?
- Right-click menu: does it add handy options to your file manager?
- Bundled offers: does the installer try to add extra software?
How to send a big folder safely
- Put everything you're sending into one folder.
- Right-click and compress it into a single archive.
- Add a password if the files are private.
- Send the password separately, by text or a call.
- Ask the recipient to confirm it opened correctly.
Compression mistakes to avoid
- Password in the same email. Send it another way.
- Zipping photos to save space. It barely helps.
- Odd formats for clients. Stick to ZIP for anyone non-technical.
- Deleting the originals. Check the archive opens first.
If you're sending documents to clients, my post on the benefits of PDFs for business explains why a PDF is often better than a zipped folder.
Do you make file compression tools? Tool makers can ask to be considered for a featured place on this list.
My plain advice on free file compressors
Most people need one archiver and never think about it again. Pick a well-known one, set it as your default and stop downloading a new tool every time a strange file arrives. If you're sending to clients, stick to ZIP, because it's the format they'll be able to open without asking you how.
And never send an archive password in the same email as the file. It defeats the whole point of locking it.
Frequently asked questions
What's the best free file compression format?
ZIP is the most widely supported. 7z often makes smaller files but needs an archiver to open on some computers.
Can I open RAR files for free?
Yes. Many free archivers open RAR files, and newer versions of Windows can too.
Is zipping a file safe?
Yes. Add a password with strong encryption if the contents are private.
Why didn't zipping make my file smaller?
Photos, videos and music are already compressed, so zipping saves little space.
Can I compress files on a Mac without extra software?
Yes. macOS can create and open ZIP files, and free apps add other formats.
What's the difference between ZIP and 7z?
Both bundle files. 7z usually compresses more tightly, while ZIP works almost everywhere.
How do I split a large file?
Many archivers can split an archive into parts of a size you choose.
Are free archivers safe to download?
Download only from the maker's own site, and watch for bundled extras during setup.
Can I unzip files on my phone?
Yes. Most phones can open ZIP files, and apps handle other formats.
Do I need to pay for WinRAR?
WinRAR is trialware. Several free tools open RAR files if you'd rather not use it.
Can a zip file carry a virus?
Yes. An archive can hide a harmful file, so only open archives from people you trust and scan anything unexpected before you extract it.
