Choose for the recipient
For an ordinary bundle of files, ZIP is a sensible starting choice when you do not know the recipient’s archive tools. Both Apple’s Finder guide and Microsoft’s ZIP guide document built-in ZIP handling. If that completes the task, you may not need another app.
Keka becomes useful when the archive task is more specific. Its current format lists include creating ZIP and 7z files and extracting RAR files. Decide which of those jobs you need before choosing a format or changing the default app for every archive.
This table is a recipient-oriented recommendation, not a measured comparison of compression ratios.
| Your situation | Starting choice | What to confirm |
|---|---|---|
| Recipient’s tools are unknown | Ordinary ZIP | They can extract a harmless sample |
| Recipient confirms a suitable 7z tool | Consider 7z | The exact options, including any password, work in their tool |
| You received a RAR archive | Extract it with a supported tool such as Keka | You have the complete archive and any required password |
| You must create a RAR archive | Choose a tool with documented RAR creation | Ordinary Keka does not provide that job |
| The archive needs a password | Agree the format and extraction tool first | A familiar extension alone does not establish encrypted-archive support |
Creation and extraction are different jobs
Keka lists creation and extraction formats separately. Its RAR support covers extraction. The project’s RAR documentation describes extra binaries and changing the app’s signed/sandboxed setup as an unsupported path. Treat that as a reason to choose an appropriate creation tool, rather than ordinary Keka setup instructions.
The same distinction helps with an archive someone else sent you: select a supported extraction action. You do not need to recreate the archive merely to read its contents.
Choose a download channel
The official website offers a direct download, while the Mac App Store offers a paid purchase. Keka describes the store edition as the same app with updates delivered through the store. Choose the channel that fits how you manage software; compare the current listing before paying, rather than assuming a separate feature tier.
On 23 October 2026, the official web download and the US Mac App Store listing both specified macOS 10.10 or later. That is a listed minimum, not a tested compatibility matrix. Check the download you actually choose; store and web releases need not become available at the same moment.
A small archive workflow
For a basic ZIP on the Mac, Apple’s documented route is to Control-click the selected file or folder and choose Compress. For Keka, the compression guide, last edited in 2021, documents these actions. Check their labels in your installed release:
- Open Keka and choose the agreed format and options.
- If your sample needs a password, enter a disposable one in the documented Password and Repeat fields.
- Drop source copies onto the Keka window or its Dock icon. For already-compressed input, use the window’s compression option so you package the input instead of extracting it.
For an incoming archive, Keka documents dropping it into the app and entering the password if the supported archive requires one. Extract into a separate destination and inspect the result. Retain the original files until you have checked the handoff.
A password changes the handoff
Keka’s site describes AES-256 for password-protected 7z and legacy encryption for ZIP. A separate project page also documents an AES-ZIP option, so the extension alone does not identify all the settings in use. The compression wiki documents an option to encrypt filenames in 7z, too. These are documented capabilities, not an independent assessment of their implementation.
Check the recipient’s exact extraction tool. Microsoft’s documentation lists 7z support in Windows 11 version 24H2, while specifically excluding encrypted-archive operations from that support. Ask which Windows version and extraction tool the recipient uses before choosing an encrypted 7z archive.
Use harmless content to agree a workable format and password process before sharing sensitive material. For work files, use your organisation’s approved method. No password option here establishes compliance with that policy, and no security or interoperability testing was performed for this guide.
A proposed recipient check
Create a small sample folder with two harmless text files containing distinct made-up markers. Choose the intended archive format and settings, then ask the recipient to extract it with the tool they will actually use. Have them open both files and confirm the markers. If a password is required, include that step in the exercise using a disposable sample password and the intended separate communication method.
This is a proposed handoff check, not a reported test. It establishes only what you observe with those files, options and recipient tool. Keep the source copies; do not promise that a different document set will compress by a particular amount or arrive faster.
Choose Keka when one of its documented archive jobs is missing from your routine. Keep ordinary ZIP simple when it already works, and make recipient extraction part of the decision. The LocalSend guide covers the separate step of delivering a file to a nearby device.