BlancMessages Is Using 26 GB and 'Review Large Attachments' Only Offers 1 GB
A real example, from a 64 GB iPad that filled up again within an hour of being wiped: Messages, 26.81 GB. Tap the iOS recommendation, Review Large Attachments, and it offers to free 1.32 GB. Delete all of it and 25 GB remains, with nothing left to click.
This is not a bug, and the missing 25 GB is not hiding anywhere exotic. It's an arithmetic problem that iOS presents in a way that makes it look like a malfunction.
Where the space actually is
Review Large Attachments does exactly what its name says. It sorts your message attachments by size and shows you the top of that list — the videos, the long voice notes, the occasional enormous GIF. It's built for the case where a handful of big files are the problem.
That isn't most people's case. After years of messaging, the bulk of the storage is tens of thousands of small attachments: photos someone sent you, screenshots forwarded back and forth, stickers, reaction images, voice notes of a few seconds, link previews with thumbnails. Individually each is a few hundred kilobytes. Nothing in that list is large enough to appear in a tool that ranks by size, and there are forty thousand of them.
So the tool is telling the truth: there really are only 1.32 GB of *large* attachments. The other 25 GB is made of items that are, individually, too small to mention.
Why deleting conversations barely helps
The natural next move is to delete some old threads. It disappoints for two reasons.
The heavy threads are usually the ones you'd never delete — family, a partner, a group chat running for years. And the attachments aren't evenly spread; a single active group chat can hold more data than a hundred dormant one-off conversations combined. You can clear fifty threads, feel productive, and recover almost nothing.
There's also a delay. Deleted messages sit in Recently Deleted inside Messages for up to 30 days, the same way photos do. If you cleared a lot yesterday and the number hasn't moved, check Messages → Edit → Show Recently Deleted before concluding it didn't work.
The setting that actually fixes it
Settings → Messages → Keep Messages, changed from Forever to 1 Year or 30 Days.
This is the only control that operates on the whole pile at once. Set it, confirm, and iOS deletes every message and attachment older than the window — in one pass, across every conversation. On a library like the one above it typically frees somewhere in the twenties of gigabytes, and it takes a few minutes to run.
It is irreversible, and it is genuinely destructive. Read that sentence twice before tapping. This deletes the messages themselves, not just the attachments: conversations with people you've lost, photos sent to you that exist nowhere else, addresses and codes and details you assumed you could scroll back for. There is no undo and Recently Deleted does not save you from this one.
So before you change it: scroll each thread that matters and save what you'd miss to Photos or Files. Long-press a photo → Save. For an important conversation, screenshots of the text itself are worth the two minutes. 1 Year is the sensible default for most people — it clears the ancient bulk while leaving anything recent intact.
The less drastic options
If deleting years of history isn't acceptable, these help, though none matches the setting above:
- Turn off automatic saving. Settings → Messages → Keep Audio Messages set to After 2 Minutes stops voice notes accumulating forever. Also worth checking whether messages photos are auto-saving into your library and duplicating everything.
- Work the biggest thread by hand. Open the conversation → tap the contact name → scroll to the attachment grid → See All → Select. Deleting in bulk from your largest group chat can be worth several gigabytes on its own.
- Disable Messages in iCloud, carefully. This stops the library syncing everywhere, but it doesn't shrink it, and it introduces its own restore problems. Rarely the right answer.
- Take the 1.32 GB anyway. Review Large Attachments is quick and safe, and the videos it finds are usually genuinely disposable. Just don't expect it to solve anything.
Read the numbers, then decide
The general lesson is worth more than the specific fix. When iOS offers to free a fraction of what a category is using, that gap is telling you the shape of the problem: many small files, not a few big ones. Same reasoning applies to a photo library where deleting hundreds of items frees almost nothing — usually because they were only previews, not originals.
Once Messages is dealt with, Photos is almost always the next largest number, and it doesn't have a Keep Messages equivalent — there's no setting that decides which memories were worth keeping. That part is manual, which is fine, as long as you're not re-reviewing the same photos every attempt. Blanc exists for that; or start with what's really eating your storage if you haven't checked yet.