ZIP vs 7z: Compatibility, Compression, and Encryption
ZIP is suitable for transferring multiple files widely. 7z is equipped with LZMA system, solid compression, AES-256, and file name encryption, but it is necessary to confirm compatibility on the receiving side.
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Who this guide is for and what to prepare
- People who want to know the difference between ZIP/7z
- People who want to start with a small, safe test
What you need
- Make a test copy leaving the original data
- Check the compatibility conditions and storage location of the destination
Comparison criteria
ZIP is suitable for transferring multiple files widely. 7z is equipped with LZMA system, solid compression, AES-256, and file name encryption, but it is necessary to confirm compatibility on the receiving side.
Scroll horizontally to see the full table →
| standard | ZIP | 7z |
|---|---|---|
| compatibility | Easy to handle as OS standard | Check compatible apps |
| compression | For distribution | High compression/solid |
| encryption | Windows standard not supported | AES-256 |
Choosing for your situation
If you cannot specify submission or add additional apps, use ZIP, and if both parties can use compatible software and prioritize compression and encryption, use 7z. The difference may be small for compressed materials such as JPEG.
This does not mean that ZIP itself cannot support encryption. ZIP has multiple encryption methods, but the built-in Windows compression and extraction tools cannot handle encrypted archives, so check the combination of the creation tool and the recipient's tool. 7z also has a configuration where the name list is hidden only when [Encrypt file names] is enabled, and the names are visible only when a password is set.
First steps to try
Create the same small folder in both formats, extract it to another folder, and check the number and contents. Test 7z encryption and confirm that the file list is hidden without the password.
- Select the target copy in Explorer and create a ZIP by right-clicking [Compress to] or [Send to]
- Use 7-Zip's [Add to archive] to change the archive format to 7z, and create 7z from the same target.
- For a test 7z archive that contains sensitive information, set a password, select AES-256 encryption, and enable [Encrypt file names] if necessary.
- Extract both to separate folders in the same environment as the receiving side and check the number of files and contents.
Operational notes
Compression is not a backup. Keep the original on another medium and do not send the password through the same route as the archive.
Limitations and requirements
- The encrypted archive verifies the response of the receiving side.
- Don't make the archive your only storage destination
Frequently asked questions
What about smartphones?
If you are unsure about 7z compatibility, test the expansion using ZIP.
Can I delete the original?
Important data will also be saved on another medium.
Official sources and verification date
Sources checked: . Check the official sources below for changes to supported systems, plans and menus.