The worst time to discover your phone is full is the moment you try to take a photo and get "Storage Almost Full" instead. The good news: most phones are full of stuff you don't actually need, and you can usually reclaim several gigabytes in about ten minutes.

This is a practical, no-nonsense guide on how to free up storage on your phone β€” covering both Android and iPhone. We'll start by finding what's actually eating your space (it's almost never what you think), clear it safely without losing anything important, and then set up a couple of habits so it stops filling up every few weeks.

Why your phone keeps running out of storage

Storage fills up from a few predictable places:

  • Photos and videos β€” by far the biggest culprit on most phones. A few minutes of 4K video can eat a gigabyte on its own.
  • App caches β€” apps quietly store temporary files (thumbnails, downloaded media, map tiles) that grow over time.
  • Downloads and attachments β€” PDFs, WhatsApp images and videos, voice notes, and files you opened once and forgot.
  • Offline content β€” Netflix downloads, Spotify/podcast episodes, and offline maps.
  • "System" / "Other" β€” the part everyone panics about. It's mostly the operating system, caches, and temporary files the phone manages itself. You can't (and shouldn't try to) delete it manually.

The order matters: clear the big, safe wins first (photos and large files), and you usually won't need the risky stuff at all.

First, see what's actually using your space

Don't delete blindly. Both systems have a built-in breakdown that shows exactly where your gigabytes went.

  • iPhone: Settings β†’ General β†’ iPhone Storage. You'll see a colored bar, personalized recommendations, and every app sorted by size, including how much is the app itself versus its data (Apple Support).
  • Android: Settings β†’ Storage (wording varies slightly by brand). You'll see usage grouped into categories like images, videos, apps, and system (Android Help).

Spend 30 seconds reading this screen before you do anything. Usually one or two categories account for most of the problem.

Photos and videos: usually the #1 culprit

If your storage breakdown is dominated by photos and videos, fix this first β€” it gives the biggest payoff.

Step 1 β€” Back them up. Don't delete photos that exist only on your phone. Back up to a cloud service or your computer first. In Google Photos, you can then tap your profile picture β†’ Free up space on this device, which safely removes the local copies that are already backed up while keeping them available in the app (Google Photos Help). On iPhone, turning on Optimize iPhone Storage (Settings β†’ Photos) keeps full-resolution originals in iCloud and lighter versions on the device.

Step 2 β€” Shrink what you keep on the phone. Many photos are far larger than they need to be for sharing or messaging. Compressing or resizing them before you store or send them can cut their size by more than half with no visible difference on a screen. Our free Image Compressor and Resize Image tools both run entirely in your browser β€” your photos are never uploaded to a server, so it's a private way to slim down a batch of images before you back them up. (If you're trimming images for a site instead, see how to compress images for a website and the best image sizes for social media.)

Step 3 β€” Delete the obvious bloat. Screenshots, burst shots, near-duplicates, and old screen recordings add up fast. Both Google Photos and Android's Files by Google can surface duplicates, blurry shots, and large videos for quick review.

How to free up storage on iPhone (step by step)

  1. Empty Recently Deleted. Deleted photos sit in an album for up to 30 days and still count against storage. In Photos β†’ Albums β†’ Recently Deleted, delete them permanently.
  2. Offload unused apps. Settings β†’ Apps β†’ App Store β†’ turn on Offload Unused Apps. This removes apps you don't use but keeps their data, so reinstalling later picks up where you left off (Apple Support).
  3. Clear the Safari cache. Settings β†’ Apps β†’ Safari β†’ Clear History and Website Data.
  4. Delete downloaded media. Remove offline TV shows, movies, and podcasts you've already watched.
  5. Check Messages. Photos and videos sent in iMessage pile up. Settings β†’ General β†’ iPhone Storage β†’ Messages lets you review and delete large attachments, and you can set messages to auto-delete after a year.

How to free up storage on Android (step by step)

  1. Use the built-in cleaner. Settings β†’ Storage β†’ Free up space (or open Files by Google β†’ Clean) to remove junk, duplicates, and large or blurry files in a few taps (Android Help).
  2. Free up space in Google Photos once your library is backed up (see above).
  3. Clear an app's cache for the worst offenders: Settings β†’ Apps β†’ (app) β†’ Storage β†’ Clear cache. This deletes temporary data only, not your accounts or saved content β€” the app may just load a little slower the first time afterward.
  4. Empty the trash in Files, Photos, and Gmail, which can each hold deleted items for weeks.
  5. Delete offline downloads in Netflix, Spotify, YouTube, and Maps.

Tame the apps that hoard space

A handful of apps cause most repeat offenses:

  • WhatsApp / Telegram: auto-saved photos and videos are huge. Turn off auto-download of media on mobile data, and use the in-app storage tool (WhatsApp β†’ Settings β†’ Storage and Data β†’ Manage Storage) to delete large or forwarded files.
  • Streaming apps: delete watched downloads and lower the download quality in settings.
  • Camera: if you rarely need 4K, drop video to 1080p in the camera settings β€” it dramatically reduces file sizes going forward.

A word on cloud backup (it's not infinite or free)

Moving photos to the cloud is the cleanest way to free local space, but be realistic about the limits:

  • iCloud gives you 5 GB free; more requires a paid iCloud+ plan.
  • Google gives you 15 GB free shared across Gmail, Drive, and Photos β€” and Google Photos' old unlimited "free" backup ended in mid-2021, so new uploads count against that 15 GB.

So cloud backup relocates the problem rather than erasing it. Compressing images before upload (above) stretches a free tier much further, and a proper backup routine β€” ideally more than one copy β€” protects the photos you can never replace.

Common mistakes to avoid

  • Deleting before backing up. Get photos safely off the phone first, then remove the local copies.
  • Chasing "System / Other." Don't install apps that promise to "clean system files" β€” they rarely help and can cause problems. Let the OS manage it.
  • Force-clearing every app's data. Clear cache is safe; Clear storage/data logs you out and wipes the app's saved content. Know the difference.
  • Paying for cloud storage before decluttering. Clear the junk and duplicates first β€” you may not need the upgrade at all.

FAQ

What's taking up the most space on my phone? Usually photos and videos, followed by app caches and downloads. Check the exact breakdown in Settings β†’ iPhone Storage (iPhone) or Settings β†’ Storage (Android) before deleting anything.

Is it safe to clear an app's cache? Yes. Clearing the cache only removes temporary files; your logins and saved data stay. The app may load slightly slower the next time. Avoid "Clear storage/data," which resets the app and signs you out.

What is "System" or "Other" storage, and can I delete it? It's mostly the operating system plus caches and temporary files the phone manages on its own. You can't safely remove it by hand, and it usually shrinks itself as you free up real space.

How do I free up space without deleting my photos? Back them up to the cloud or a computer, then use "Free up space" (Google Photos) or "Optimize iPhone Storage" to remove the local copies while keeping the originals accessible. Compressing images first makes your cloud allowance last longer.

Will deleting photos from my phone delete them from the cloud? If you use the dedicated "free up space" option, no β€” it only removes already-backed-up local copies. But manually deleting inside a synced photos app can remove the cloud copy too, so always confirm the photo is backed up first.

Next steps

Freeing up storage is a ten-minute job, but keeping it free is a habit: back up and clear photos monthly, turn off media auto-download in chat apps, and compress images before you hoard them. For the bigger picture, read our guides on organizing your digital files and backing up your data the right way β€” and when your laptop starts feeling sluggish too, here's how to speed up a slow laptop.