Files by Google’s Clean tab is the fastest way to claw back a few gigabytes on a full Android phone. It reads your storage, groups the obvious junk into review cards, and lets you clear each pile with a single confirm. Most of the time it does the right thing. Sometimes it flags a folder you would rather keep. This walkthrough goes card by card so you know what each one actually contains before you tap Delete.
Files by Google is pre-installed on Pixel and most Android One phones and free on every other device. It’s 18 MB, ad-free, and made by Google, so it has the same trust surface as Chrome or Photos.
Before you start: two settings that make cleaning safer
Open Files by Google, tap the menu at the top left, and take thirty seconds on two toggles.
Turn Trash on. Menu → Trash → Turn on Trash. This is the single most important step. With Trash enabled, anything you delete through Files by Google sits in a recoverable Trash for 30 days instead of vanishing immediately. If you clean too aggressively and realise it later, you can restore. Without Trash on, delete is delete.
Check your Google account. Menu → Settings → verify the Google account you’re signed in with. Some cleaning suggestions read from Google Photos and Google Drive; you want the right library informing them.
Now go to the Clean tab (the broom icon at the bottom). What you see depends on how full your phone is and which apps you use, but the categories cycle through the same short list.
Junk files: safe to clear
The Junk files card is the safest one. It bundles cached data that apps re-download on demand: image thumbnails, video previews, temporary log files. Nothing you created lives here.
Tap Confirm and free up, then tap Clear on the confirmation sheet. The number you save is usually the biggest single win in the app — anywhere from a few hundred megabytes to several gigabytes on a heavily used phone.
Two small caveats. Cleared caches will rebuild the next time you open the affected apps, so the first launch of Instagram or Chrome after cleaning takes a second longer. And a small subset of apps — banking apps, some regional messengers — store login tokens next to their cache. If you’re prompted to sign in again after cleaning, that’s why. It’s not a sign anything went wrong.
Downloaded files: read before deleting
The Downloaded files card lists everything in the /Download folder that hasn’t been opened recently. Files by Google isn’t judging whether the file is important; it just notices you haven’t used it in a while.
Tap the card to open the full list. Scroll through and untick anything you want to keep before hitting delete. Common false positives:
- Contract PDFs, bank statements, and invoices you saved from email
- WhatsApp voice notes and documents you downloaded once for reference
- Installers or APKs you keep on hand for reinstalling apps offline
If you’re not sure, long-press a file to preview it. If it looks familiar, untick it. The rest — expired boarding passes, promotional PDFs, that one funny GIF from three months ago — can go.
Large files: sort by size, not by suggestion
Files by Google flags files above 10 MB that haven’t been opened recently. It’s a useful hint but not a verdict.
Open the card and tap Sort by size at the top. This surfaces the biggest offenders first. On most phones the top of the list is dominated by three things: video files, large PDFs, and app data exports (backups you made yourself and forgot about).
For each big file, ask two questions. Can you re-download it from the source? Do you have a copy elsewhere? If both answers are yes, delete. If either is no, move it to Google Drive first using the three-dot menu → Backup to Google Drive. That gets it off local storage without losing the file.
Backed up media: the one that trips people up
This card only appears if you’re using Google Photos with backup and sync enabled. It lists photos and videos that Photos has confirmed are safely uploaded, so they can be removed from the phone without losing anything.
The pattern is safe, but two conditions have to be true before you clean here. Your Google Photos backup has to be complete — check the little cloud icon on the Photos home screen and make sure it says “Backup complete”, not “Waiting for Wi-Fi”. And your Google account has to actually have the storage. If you’re near your Google One quota, some photos may have failed to back up silently.
Open Google Photos first, confirm backup complete, then come back to Files by Google and clear. Otherwise the safer move is to skip this card and clear photos manually from Photos → Free up space, which does the same check.
Duplicate files: check before you nuke
The Duplicate files card groups files with the same content. Two identical photos saved to different folders, two copies of the same PDF, the same MP3 in two music folders.
Files by Google keeps one copy and offers to delete the others. On paper this is fine. In practice, the copy it keeps isn’t always the one you want. If you have a photo in DCIM/Camera (the original) and the same photo in Pictures/WhatsApp Images (a shared copy), Files by Google might keep either one. Deleting the DCIM copy is usually fine because Photos backed it up under the shared copy too, but if you’re managing a specific folder structure, review before confirming.
Tap the card, expand each duplicate group, and check which copy is ticked for deletion. Untick if it’s the wrong one.
Old screenshots: usually safe
Screenshots older than 30 days are grouped separately from other photos. Most phones accumulate hundreds of screenshots that were useful once — a receipt, a share sheet, a two-factor code — and never again.
The safe pattern: back up your screenshots folder to Google Photos, wait for the upload to finish, then let Files by Google clear the local copies. That way the screenshots aren’t gone; they’re just not on your phone. If a specific screenshot is useful evidence (a scam text, a contract term, a receipt), star it in Photos first so you can find it later.
Memes and other WhatsApp media
If you use WhatsApp, this card will surface. It targets received media specifically: images, videos, voice notes, and forwards that pile up in the WhatsApp Media folder.
Two things to know. First, WhatsApp media clears independently of your chats — the messages stay, the local media file gets removed. If someone re-opens a chat with a cleaned attachment and taps the thumbnail, it will re-download from WhatsApp’s servers, so long-form chats aren’t broken by the clean. Second, WhatsApp voice notes you sent yourself and never played on another device may not be recoverable. If you use WhatsApp as a voice-memo scratch pad, review before deleting.
What Files by Google can’t delete
Two categories of storage are invisible to the Clean tab, and understanding this saves you from expecting more than the tool can do.
Live app caches. Android reserves per-app cache that only the app itself can clear. Files by Google can see totals, not individuals. To clear a specific app’s live cache, open Settings → Apps → the app → Storage → Clear cache.
Files belonging to uninstalled apps. When you uninstall an app, some of its files sometimes stay behind in a folder named after the developer or the app. Files by Google doesn’t correlate these to the missing app, so they don’t get flagged as orphaned. To find them, open the Browse tab, scroll to Internal storage, and delete folders whose names you don’t recognise — after a quick web check that they’re not shared system folders like Android/data.
Recovering from a bad delete
If Trash is on and you deleted something you wanted, open the menu, tap Trash, long-press the file, and choose Restore. Restored files go back to their original folder.
If Trash is off, or the file was in Trash more than 30 days, recovery is app-specific. Photos and videos that Google Photos backed up before deletion are still in Photos → Library → Utilities → Trash for 60 days. Files that were only ever local are gone.
When Files by Google isn’t enough
For most people, running the Clean tab once a month keeps the phone comfortable. If you regularly fill your storage, or you’re on a device with 32 GB or less, you’ll hit the tool’s ceiling. That’s when a dedicated cleaner or duplicate scanner earns its place. Our rundown of Files by Google alternatives and deeper cleaners covers seven apps that pick up where the Clean tab stops, and the Clean Master alternatives comparison is worth reading before you install any of them — the category has a long history of hostile ads.
For specific problems, targeted guides help more than a general cleaner. Cleaning junk files on Samsung Galaxy phones covers the built-in Device care flow that overlaps with Files by Google. And if photos are the real space hog, duplicate photo finders for Android go further than the Clean tab’s simple content match.
FAQ
Is it safe to let Files by Google delete junk files automatically?
The Junk files category, yes — it’s cache data that rebuilds on demand. Other categories deserve a review because they include user files, not just cache. Never enable automatic deletion for downloads, large files, or backed up media without checking what’s in the card first.
What counts as a junk file on Android?
App-generated cache, thumbnails, log files, and temporary files apps create for their own convenience. Anything you didn’t save yourself. Junk files rebuild automatically the next time you use the affected app, so clearing them costs nothing but a slightly slower launch.
Will Files by Google delete an app?
No. Files by Google only removes files. To uninstall an app, use the app drawer or Settings → Apps. Some apps do leave folders behind after uninstall — those you can safely remove through the Browse tab once you’re sure the app is gone.
Is Files by Google safe?
It’s a first-party Google app with a small install size, no ads, and no in-app purchases. Aptoide’s malware scanner marks it as TRUSTED. If you’re already trusting Google’s other pre-installed apps (Photos, Drive, Gmail), Files by Google fits the same trust surface.
How does the Clean tab compare to Samsung's Device care?
Both do the same basic job, but Files by Google’s Clean surfaces are more conservative and clearer about what each card contains. Samsung’s Device care is bundled with battery, memory, and security tools that go beyond storage. If you’re on a Samsung phone, running both once in a while catches slightly different things. Our Files by Google vs Samsung My Files comparison has the detail.
