Compress iPhone Video on Mac: Settings for Email, Sharing, Storage

Apple estimates that one minute of 4K at 30 fps HEVC “may use more than” 175 MB. That is about 23 megabits a second, so a 25 MB email cap is gone after roughly nine seconds of footage. ProRes is in another league, as the table shows.

Those are Apple’s estimates for its Final Cut Camera app, and Apple words them as “more than”. Other frame rates, 60 fps and busy scenes can push a clip higher. The reliable number is the size of your own file in Finder.

Pick the codec for the audience, then the resolution, then the quality. H.265 gives the smaller file; H.264 plays almost everywhere. The quality numbers below are starting points we chose, not measured thresholds, so test one clip first.

Smol’s resolution options are original, 3840, 1920, 1280 and 854. How much H.265 saves depends on the footage: in our H.265 versus H.264 test at CRF 28 it saved 3% on a calm clip and 29.9% on a busy one. Dropping resolution is often the bigger lever; the 4K compression guide found a 1080p version at 13% of the size scored as indistinguishable by VMAF (that test used CRF 28).

Drop the iPhone .mov into Smol, choose Compress and set the output to MP4. Choose H.264 if the file must play on Windows or in a browser, or H.265 if you only want a smaller file and the viewers use Apple devices.

The distinction matters. Apple says Most Compatible records “JPEG or H.264” and High Efficiency records HEIF and HEVC, per its Camera formats page. HEVC is the smaller format, but in our compatibility check only 16.94% of global browser usage fully supported it (caniuse, 27 September 2026). A plain container swap is covered in MOV to MP4 on Mac; changing the codec means re-encoding, which is what Compress does. You can also set the phone to Most Compatible, at the cost of bigger new files.

Get the clip onto the Mac first, then work on a copy of the batch.

1. 1

   Move the clips to your Mac

   AirDrop, Image Capture or Photos export all work. Keep this folder as your originals.

2. 2

   Drag the files or the whole folder into Smol

   A batch is fine, and you can mix a video with photos or a PDF.

3. 3

   Choose container, codec and quality

   Use the goals table above. Start at High; move to Web only if the copy is still too big.

4. 4

   Set the resolution

   1920 for most sharing, 1280 or 854 for email. Leave original for the archive.

5. 5

   Run it and read the per-file sizes

   The copy is written beside the original with a _compressed suffix by default. Play the first few seconds before you delete anything.

6. 6

   Check it against your cap

   Smol sets quality and resolution, not a byte count. If the copy is over, rerun at a lower resolution or Web quality.

Because the cap applies to the whole message, not just the video. Gmail and Outlook.com stop at 25 MB, and email encoding adds overhead, so our email video guide aims at about 15 MB. At that budget, a clip of a minute or more usually needs a lower resolution as well as lower quality.

• Compress to H.264 MP4 at 1280 or 854 wide with Web quality, then check the size.
• Use Mail Drop from Apple Mail: up to 5 GB, and the link expires after 30 days.
• Let Gmail turn it into a Drive link, as Google describes, if the recipient can open links.
• For chat apps, see video size limits for WhatsApp.

Apple says ProRes files are “up to 30 times larger than HEVC files”, and its estimates run from 3.1 GB to 6.6 GB a minute at 4K, 30 fps. That is roughly 18 to 38 times the 175 MB HEVC figure. A ProRes take is an editing master, so keep it until the edit is done.

Apple’s ProRes page also says you need at least 10 percent of storage free to record in it. On the Mac, compress a delivery copy to H.265 MP4 and judge it by eye, since the take is already an intermediate. For multi-camera work see video teams.

Free tools come first. QuickTime Player’s export menu labels its options “Smaller File Size (HEVC)” and “Greater Compatibility (H.264)” per Apple, which is enough for one clip.

Smol’s edge is batches: a folder of clips, a saved preset on that Mac, a Finder Quick Action. The batch video guide shows the workflow.

• You need an exact file size such as 15 MB. Smol has no size target for video, so use a two-pass encoder (see the email guide).
• You are editing. Compress the delivery copy, never the footage you will cut.
• You work on Windows, Linux or an iPhone only. Smol is macOS only.
• The clip is a single 20-second file that QuickTime can already export small enough.

Price

Solo is $29 once for one Mac, with free updates. There is no free trial and no refund; the homepage has an in-browser demo that is not the app. See pricing.