When you export iMovie to a file, the format and resolution you choose should match where the video is going. Here's a practical breakdown:
YouTube and Vimeo
Export at 1080p (or 4K if available), quality set to Best. iMovie encodes in H.264 or HEVC – both are fully supported by YouTube. No conversion needed.
Instagram Reels and TikTok
These platforms use vertical video. If you shot on iPhone in portrait mode, iMovie preserves the orientation – this covers imovie export vertical video without any extra steps. Export at 1080p, quality High.
WhatsApp and messaging apps
For sending via messaging, 720p at standard quality keeps the file size manageable while still looking good on mobile screens.
Personal archive
Always go Best Quality at the highest available resolution. You can always compress a file later – you can never recover quality that was lost during export.
How to Save iMovie as MP4 (Instead of MOV)
By default, iMovie exports video in the .mov container. If you specifically need to save iMovie as MP4 or export iMovie to MP4, here are two reliable approaches:
Option 1 – Via QuickTime Player (Mac):
After exporting the .mov file, open it in QuickTime Player. Go to File → Export As → 1080p (or your preferred resolution). QuickTime will save a new copy in .mp4 format.
Option 2 – Encode via Finder (Mac):
Right-click the .mov file in Finder → Encode Selected Video Files → choose format and quality. The output will be .m4v or .mp4.
On iPhone, videos saved to Photos are already in a compatible H.264 format that most platforms accept natively – the container is usually .mov, but the codec is universally playable.