Summarize:

Tap the Chrome app icon, which resembles a red, yellow, green, and blue sphere. This icon is in the top-right corner of the screen. A drop-down menu will appear. It's in the middle of the drop-down menu. This red-text option is in the bottom-left corner of the screen. On Android, tap CLEAR BROWSING DATA... at the top or bottom of the screen. If you're using an Android, tap the "Time range" menu near the top of the screen, then tap All time in the resulting menu. This option is the default on iPhone, and cannot be changed. It's in the middle of the screen. This option will clear your Chrome browser's saved images and website files, which will clear some room on your phone or tablet.  On Android, first tap the ADVANCED tab in the top-right corner of the screen. You can uncheck every other option on this page if you don't want to clear any other browsing data. If you want to clear your browser's cached website data, check the "Cookies, Site Data" (iPhone) or "Cookies and site data" (Android) option as well. It's a red-text icon near the middle of the screen. On Android, tap CLEAR DATA in the bottom-right corner of the screen. Doing so will prompt Chrome to delete your cached files and images from your browser and phone storage. If you selected the "Cookies, Site Data" option, your website data cache will also be cleared, and you will be signed out of most sites that you were signed into. On Android, tap CLEAR when prompted.
Open Google Chrome . Tap ⋮. Tap History. Tap Clear Browsing Data…. Select a time range on Android. Check the "Cached Images and Files" option. Tap Clear Browsing Data. Tap Clear Browsing Data when prompted.