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How to check what's using your Google storage
Before deleting anything, see where the space actually went. Google has three official pages that show your usage — one for the overall split, and one for each product. Here they are, in the order that's most useful.
1. The overall breakdown
one.google.com/storage shows the panel above: how much of your quota Drive, Photos and Gmail each take. Start here to decide where the biggest win is. Google One also has a built-in “Clean up space” tool on the same page that surfaces large files and emails.
2. Your biggest Drive files
drive.google.com/drive/quota lists every Drive file that counts against your storage, sorted largest first. This is the single most useful Drive link — old video exports, ZIP backups and downloads tend to sit right at the top.
Only files you own count against your quota. If a huge file was shared with you by someone else, removing it from your Drive won't free your space — it's counted against the owner.
3. Large photos and videos
photos.google.com/storage helps you find large videos, blurry shots and screenshots you probably don't need. Videos are usually where Photos space goes.
4. Gmail — the trickiest one
Gmail has no built-in "sort by size" view, which is why it's the hardest to clean and the most likely to be quietly full. You can search for big attachments manually (see the guide below), or let MailBalance scan your mailbox and show you exactly which senders and threads use the most space.
See your Gmail storage, sorted by weight
MailBalance ranks senders and conversations by how much space they use — the view Gmail doesn't give you.