A tool to remove your own slack messages.

pip install deslackify

Generate a token via: https://api.slack.com/custom-integrations/legacy-tokens

deslackify --token TOKEN USERNAME

By default deslackify will remove USERNAME's messages that are more than a year old. You may also manually specify a before date via:

deslackify --token TOKEN --before YYYY-MM-DD USERNAME

Note: If no results are found, you may need to replace USERNAME with USERID. You can find the USERID by going to Profile & Account, and then clicking the three dots, and at the bottom, "Copy member ID".