Tool deletes all of your messages from chat/channel/dialog on Telegram without admin privilege. Official Telegram clients don't support deletion for all own messages from chat with one click (you need to manually select messages that you want to delete and you can delete only 100 selected meesages per time).
TgEraser decides this problem.
pip install tgeraser tgeraser
You need to specify own api_id and api_hash which you can get here
Tool deletes all your messages from chat/channel/dialog on Telegram. Usage: tgeraser [ (session <session_name>) -cdl NUM [ -i FILEPATH | -j DICT | -e ] -p PEER_ID ] | [ -k ] tgeraser session <session_name> -p PEER_ID -t STRING tgeraser session <session_name> -w tgeraser -h | --help tgeraser --version Options: -i --input-file FILEPATH Specify YAML file that contains credentials. [default: ~/.tgeraser/credentials.yml] -j --json DICT Specify json string that contains credentials (double quotes must be escaped). -e --environment-variables Get credentials from environment variables (TG_API_ID, TG_API_HASH, TG_SESSION). -d --dialogs List only Dialogs (Chats by default). -c --channels List only Channels (Chats by default). -w --wipe-everything Delete ALL messages from all chats/channels/dialogs that you have in list. -p --peers PEER_ID Specify certain peers by comma (chat/channel/dialog). -l --limit NUM Show specified number of recent chats. -t --time-period STRING Specify period for infinite loop to run messages deletion every X seconds/minutes/hours/days/weeks. Example: --time-period "3*days" OR --time-period "5*seconds" -k --kill Kill existing background tgeraser processes (only for Unix-like OS). -h --help Show this screen. --version Show version.