This wikiHow teaches you how to delete all your Snapchat conversations from the Chats page.
Steps

Step #1. Open the Snapchat app
The app has an icon of a white ghost on a yellow background.
- If you are not logged in, tap login and enter your username (or email address) and password.

Step #2. Swipe down on the camera screen
You will now see your profile page.

Step #3. Tap on ⚙️
This button is located in the top right corner of the screen.

Step #4. Scroll down and tap on Clear Conversations
This button is located at the bottom of the Settings page under the "Account Actions" heading.

Step 5. Tap on Clear All
This option is in the top right corner of the screen.
- You can also click on the X tap to the right of a contact's name to clear only that person's conversation history.

Step 6. Tap on Clear Feed
Tapping it confirms your decision and deletes your entire conversation history.
Clearing your conversation history will also delete all streaks and best friends
Tips
Clearing your conversation history frees up some space on your phone
Warnings
- when you're on Clear feed you will not be able to recover the erased conversation history.