Why iPhone videos take up so much space
Recent iPhones can record 4K at up to 60 frames per second, and many are set to do so by default. The camera uses a high bitrate to keep fine detail, which is great for editing and big screens but means a short clip can be hundreds of megabytes. When you try to send that clip by email, Discord or a web form, you hit size limits; when you keep hundreds of them, your iCloud storage fills up.
Most iPhones save video in the HEVC (H.265) codec inside a .MOV file when “High Efficiency” is enabled. HEVC is efficient, but not every Windows PC, older Android phone or website plays it. This tool converts the video to H.264 MP4, the most compatible format, while reducing the size.
How to compress a video on iPhone
- Open this page in Safari (or Chrome) on your iPhone.
- Tap Choose video and pick the clip from your Photo Library or the Files app.
- Keep the preset — Medium quality at 1080p — or choose 720p if you are sending it through a chat app.
- Tap Compress video. Keep the screen on and the tab open while it works.
- Tap the download button and save the MP4 to Files; from there you can share it or save it to Photos.
Long 4K clips are heavy work for a phone browser. If the tab reloads or the phone gets hot, AirDrop the video to a Mac or send it to a computer and compress it there — the result is identical.
Recommended settings for iPhone footage
- Keep for yourself / upload to YouTube: Quality High, 1080p. 4K to 1080p alone usually saves a lot of space.
- Share with family or on social media: Quality Medium, 1080p (the default).
- Send in chat apps: 720p. See the WhatsApp and Discord presets.
- Email or a form with a size limit: switch to Target size and enter the limit — or use the email preset.
Make future iPhone videos smaller
Prevention is easier than compression. In Settings › Camera › Record Video, choose 1080p at 30 fps unless you really need 4K. In Settings › Camera › Formats, keep High Efficiency selected — HEVC files are much smaller than “Most Compatible” H.264 recordings. If you shoot slow-motion or Cinematic mode only occasionally, remember those modes produce especially large files.
Freeing up iPhone storage safely
After compressing, check the new file plays correctly and looks good enough before you delete the original. Deleted items stay in the “Recently Deleted” album for a while, so storage is only freed once you empty it. If you use iCloud Photos with “Optimise iPhone Storage”, full-size originals live in iCloud and your phone keeps smaller versions; compressing then mainly helps when you need to share a file.
Troubleshooting
- The video will not open: some formats recorded with professional apps (ProRes, high sample-rate audio) may not decode in the browser. Export a standard version first.
- The colours look washed out: HDR (Dolby Vision) videos converted to standard H.264 can look flatter. Turn off HDR video in Camera settings if you mostly share clips.
- The download does not appear in Photos: Safari saves downloads to Files › Downloads. Open it there and choose Save Video.
On a Mac? Our MOV compressor page covers QuickTime and screen recordings.