If your Gmail is still full after deleting emails, it’s likely because deleted items remain in the Trash folder, which still counts towards your storage quota. Gmail retains emails in the Trash for 30 days unless manually emptied.
Additionally, large attachments in emails, files in Google Drive, and items in Google Photos also consume storage space. Another reason could be that you’ve deleted emails from one label, but the emails exist in other labels, as Gmail uses a label-based system rather than traditional folders.
To free up space, empty the Trash, delete large emails and attachments, and review your Google Drive and Photos for unnecessary files.
The best approach to avoid running out of Gmail storage is to back up your data first and then free up space according to your specific requirements. This ensures you never encounter the “Gmail storage showing full even after deleting emails” issue. To do it you can try Advik Gmail Backup Tool and download complete Gmail mailbox to your system in a few simple clicks.