Edit: Redactor 4.0 has been tagged, adding Craft 5 compatibility. It can be installed by changing your dependency on craftcms/redactor
in composer.json
to
"craftcms/redactor": "^4.0"
...and then run composer update
.
Worth mentioning that Redactor is still on life support though, and the general recommendation is to migrate to CKEditor.
================
Original answer:
Pixel & Tonic has previously stated that the Redactor plugin is on life support, but that it will be available for Craft 5. As of March 2024, AFAIK that hasn't changed.
There's no beta release available for the Craft 5-compatible version of Redactor yet, but there is a version in development that can be installed by changing your craftcms/redactor
dependency in composer.json
to this:
"craftcms/redactor": "4.0.x-dev"
I have no idea about the state of the development version and it might be safer to wait for a beta or stable release, though.