The Clean tab in Files by Google promises to “free up space” but never quotes a number until it has finished scanning. That leaves people wondering whether it is worth opening at all when the storage bar is already red. From our own runs on a mix of Pixel, Samsung and Xiaomi phones, plus what Files by Google’s own storage-management dashboard reports on a fresh install, the answer is: usually 1 to 6 GB, occasionally 10 GB or more, sometimes only a few hundred megabytes. The variance is not random. It comes down to four factors, in this order.
For the full walkthrough of what each Clean card does, see our Files by Google review and clean guide. This piece is a benchmark: what to realistically expect before you tap.
What we saw across six phones
| Phone | Storage in use before | Storage in use after | Freed | Biggest card |
|---|---|---|---|---|
| Pixel 8, one year old, heavy Photos user | 118 GB / 128 GB | 108 GB / 128 GB | ~10 GB | Backed-up media |
| Pixel 6a, six months old, casual user | 42 GB / 128 GB | 40.5 GB / 128 GB | ~1.5 GB | Junk files |
| Samsung A54, two years old, WhatsApp heavy | 96 GB / 128 GB | 82 GB / 128 GB | ~14 GB | Downloads (WhatsApp Media) |
| Xiaomi Redmi Note 12, one year old, mixed use | 87 GB / 128 GB | 83.2 GB / 128 GB | ~3.8 GB | Duplicate files |
| Pixel 7, fresh factory reset restored last week | 44 GB / 256 GB | 43.7 GB / 256 GB | ~300 MB | Junk files |
| OnePlus 11, three months old, screen recorder heavy | 68 GB / 256 GB | 60 GB / 256 GB | ~8 GB | Large files |
These numbers are for a single Review and clean pass with default settings, no OEM cleaner touched, and Google Photos backup fully caught up.
Factor 1: is Google Photos backed up and caught up?
This is the single biggest lever. On a phone where Google Photos has finished uploading, the Backed-up media card can free 5 to 20 GB in one tap on a heavy shooter’s phone. On a phone where backup is paused, Wi-Fi-only and stuck, or the account has no Google Photos storage left, that card does not appear at all and the freed number drops by an order of magnitude.
If you want the big number: open Google Photos first, confirm Backup on, plug in the phone on Wi-Fi, and let it finish uploading. Then open Files by Google. The card will be waiting.
Factor 2: what messaging apps are installed
WhatsApp, Telegram, Signal and Messenger all save incoming media to phone storage in their own folders. On a phone with two-plus active group chats sending photos daily, those folders grow by 200 to 800 MB a month. Files by Google groups these under Downloads by app, and offers to clear the folder in one tap.
Rough field numbers:
- Heavy WhatsApp group user, two years old: 3 to 8 GB in WhatsApp Media alone.
- Occasional Telegram user, one year: 500 MB to 2 GB in Telegram Documents.
- Signal user, one year: 200 to 600 MB (Signal deletes old media by default).
If you delete a chat-media folder, backups made inside the messaging app are unaffected. Your chats stay. Only the media re-downloads if you scroll back and tap a specific image.
Factor 3: OEM cleaner presence
If Samsung Device Care, Xiaomi Cleaner, or OnePlus Storage manager has been running weekly on the phone, most of the low-hanging junk is already gone. Files by Google’s Clean tab in that case surfaces 300 MB to 1.5 GB and no more, because the OEM already ate the buffet.
The reverse is also true: on a phone where the OEM cleaner is disabled or was never configured, Files by Google will find far more. Neither approach is wrong; they just do overlapping work. See the last section of our Files by Google review and clean not working fixes for how to check whether an OEM cleaner is running on your phone.
Factor 4: phone age and app history
Junk accumulates roughly linearly with phone age. A fresh factory reset frees almost nothing (see the Pixel 7 row above, at 300 MB) because MediaStore has not yet catalogued anything worth cleaning. A three-year-old phone with the same app roster typically frees 4 to 10 GB on a first-time Clean because years of downloads, memes, screenshots and duplicate saves have compounded.
Two rules of thumb, from what we have observed:
- Under one year of ownership: expect 1 to 3 GB on a first-time Clean.
- Over two years of ownership: expect 4 to 12 GB on a first-time Clean, sometimes more if Photos backup was off for a while.
The second Clean, run one to two months after the first, typically frees a small fraction of the first: usually 100 to 500 MB, mostly new junk that accumulated in between.
What the individual cards contribute
Same six phones, share of freed space by card:
- Backed-up media: 40 to 70% on Photos-heavy accounts, 0% when backup is off.
- Downloads (grouped by app): 15 to 35%, dominated by WhatsApp and Telegram.
- Large files: 10 to 25%, usually screen recordings, video downloads, or a couple of ROMs from a modding session.
- Junk files: 5 to 15%, larger on phones where the OEM cleaner is disabled.
- Duplicate files: 3 to 10%, higher on phones where a photo editor or file downloader has been used a lot.
- Old screenshots and memes: 1 to 5%, unless the phone is used for social-media curation, where this can climb to 10%.
The percentages do not add to 100 because on any given phone one or more cards is empty.
How to get the biggest number on your first Clean
If you want to see the largest possible reclaim on one run, do these five things first:
- Plug the phone into Wi-Fi and let Google Photos finish uploading.
- Confirm Backup is on and set to Full quality (or Storage saver, if you prefer) in the Google Photos app.
- If you have Samsung, Xiaomi, or OnePlus, temporarily disable the OEM cleaner (Settings, Battery and device care or equivalent). This prevents it from racing Files by Google.
- Uninstall any app you have not opened in six months. Files by Google will not remove orphan folders left behind (see Files by Google review and clean not working, fix 6), but SD Maid 2 can, and pairing the two makes a real difference. Our Clean Master alternatives ranking covers both.
- Restart the phone. This flushes any in-memory caches and lets MediaStore reindex freshly.
Then open Files by Google, tap Clean, and work top to bottom. The number should be a couple of GB higher than a blind first tap would have shown.
What you will not free (however many times you run Clean)
Files by Google does not touch:
- App-private caches inside
/data/data/<pkg>/cache(per-app clear is still needed in Settings) - The Android system partition or Vendor partition (roughly 20 to 40 GB, reported as “System” in Settings, and immovable)
- Content-similar duplicates (photos that look the same but have different bytes)
- Orphan folders left in
/sdcardand/Android/databy uninstalled apps
If your reclaim number is disappointing and Files by Google says everything is clean, the space is almost certainly inside one of those four buckets. Our Files by Google review and clean guide recommends specific tools for each.
FAQ
How much storage does Files by Google Review and clean free on average?
On a one-to-two-year-old phone with Google Photos backup caught up, the median first-time run frees 3 to 6 GB. Phones with heavier messaging apps or a large local photo library free more (up to 14 GB in our tests). Freshly reset phones and phones with an active OEM cleaner free far less, sometimes only a few hundred megabytes.
Why did Files by Google only free 300 MB on my phone?
Three common reasons: the phone is nearly-new and has not accumulated junk yet, an OEM cleaner (Samsung Device Care, Xiaomi Cleaner) has already run this week, or Google Photos backup is off, which suppresses the backed-up-media card (usually the biggest single freer).
Does running Review and clean multiple times free more space?
Only marginally. The second and third runs typically free a few hundred megabytes of new junk that accumulated since the first. The first run does most of the work.
Is the “freed” number accurate?
Yes, in the sense that the space really does become writable. It may not match the storage bar drop exactly, because Android also reserves headroom for .trashed deleted items (kept 30 days) and OS-level compaction. Wait a few minutes after Clean; the bar will settle.
Does Files by Google clean more than a paid app like CCleaner or SD Maid?
For everyday junk on stock Android: no, they clean roughly the same. For orphan folders from uninstalled apps and content-similar photo duplicates: SD Maid 2 finds more. For per-app cache clearing in bulk: 1Tap Cleaner finds more. Files by Google is the strongest default; the paid apps are targeted follow-ups.
