Manatee

How to make a screen recording smaller on a Mac

· 6 min read

To make a Mac screen recording smaller, open it in QuickTime Player, trim the dead time at the start and end with Edit > Trim, then choose File > Export As > 1080p. That usually cuts a recording to a fifth of its original size with the text still readable. If it has to fit a specific limit (Slack, email, a ticketing system), a shrink tool that accepts a target in MB gets you there without guesswork, and recording only the part of the screen you need makes every later step easier.

Why screen recordings are bigger than they look

The built-in recorder (Shift-Command-5, or QuickTime’s File > New Screen Recording) captures the display at its full native resolution. On a Retina Mac, that is far more pixels than the “1920 by 1200” you think you are looking at: a 14-inch MacBook Pro records at 3024 by 1964, and a 16-inch at 3456 by 2234. That is roughly three times the pixels of a 1080p frame, approaching 4K.

macOS then encodes at a generous bitrate so that text stays crisp, which is sensible for a master copy and wasteful for a two-minute bug report. A five-minute full-screen recording routinely lands at 300 to 800 MB, depending on how much moves on screen. Scrolling, video playback and animated interfaces push it higher; a mostly static window with a cursor moving around keeps it lower.

The good news is that screen content compresses extremely well when encoded at a sensible size, because most of each frame is identical to the one before it. The file you send can be much smaller than the one macOS made without looking worse.

Record smaller in the first place

Everything downstream gets easier if the recording starts out reasonable.

  1. Press Shift-Command-5 to open the screenshot toolbar.
  2. Choose Record Selected Portion rather than Record Entire Screen, and drag the frame around just the window or region that matters. Half the screen is a quarter of the pixels.
  3. Open Options and turn the microphone off unless you are narrating. Audio is not the main cost, but silence is free.
  4. Close anything that animates in the background: a playing video, a bouncing Dock icon, a live-updating dashboard. Each one adds motion the encoder has to describe.
  5. Click Record, and stop with the Stop button in the menu bar (or Command-Control-Esc).

If you must record the whole display, consider temporarily choosing a lower scaled resolution in System Settings > Displays (pick one of the “Larger Text” options) for the duration of the recording. Interface elements get bigger and the pixel count drops, which makes the recording both smaller and easier to read on the receiver’s screen.

Trim and export with QuickTime Player

This is the workhorse method and needs nothing installed.

  1. Open the recording in QuickTime Player.
  2. Choose Edit > Trim and drag the yellow handles to cut the fumbling at the start and the reach for the stop button at the end. Click Trim.
  3. Choose File > Export As.
  4. Pick 1080p. For a recording of a selected portion that is already smaller than 1080p, pick the option closest to its actual size; upscaling does nothing but add bytes.
  5. Save under a new name. The export is an H.264 file that plays everywhere, including Windows and in browser previews.

QuickTime’s 1080p export of a Retina full-screen recording halves the resolution in each dimension. Regular interface text at 100 percent zoom remains readable; fine text (terminal output at 11 point, dense spreadsheets) goes soft. If your recording is about fine text, record a selected portion instead of downscaling the whole screen.

Note that QuickTime saves recordings as .mov. Its exports are also .mov, which some upload forms reject by extension even though the content is standard H.264. If that happens, how to convert MOV to MP4 on a Mac explains the quick fix.

Shrink to a size limit

Screen recordings usually exist to be sent somewhere: a support ticket with a 25 MB cap, a Slack channel, an email to a client, a form that accepts “up to 50 MB”. QuickTime’s presets give you no say in the resulting size. You export, look at the number, and either hope or try a lower resolution.

Manatee approaches it from the target. Drop the recording onto the window, switch to Shrink, type the size in MB, and it finds the quality that fits and writes a new file alongside the original. Screen recordings respond well to this: with so much of each frame unchanged from the last, a recording can often come down to a tenth of its size or less with the text still readable. The original is never touched, and the encoding runs entirely on your Mac, which matters when the recording shows internal tools, customer data or a half-finished product. No upload, no account. The first 24 hours include every feature at no cost.

What it does not do: Manatee is not an editor. It will not trim, blur a region, add a cursor highlight or cut out a section. Do the trimming in QuickTime first, and if the recording shows something that should not leave the building, re-record rather than hoping compression hides it. The specific numbers for chat tools are in how to shrink a video under Slack’s upload limit.

Resolution or bitrate: which to cut for screen content

Screen recordings are different from camera footage. A video of a beach tolerates a lower resolution gracefully; a video of a spreadsheet does not, because the information is in the fine edges of letters.

The rule of thumb:

  • For a full-screen recording, keep at least 1080p and reduce bitrate instead. H.264 copes well with static screen content at low bitrates, so the file can shrink a long way before text suffers.
  • For a selected-portion recording, keep its native size and reduce bitrate.
  • Drop frame rate before resolution. The recorder captures at up to 60 fps. Interface demos look fine at 30, and it halves the data.
  • Avoid GIF for anything longer than a few seconds. GIF is an image format with no real video compression; a ten-second screen GIF is often larger than a two-minute MP4. If a GIF is required, keep it short and low-resolution: how to convert a video to GIF on a Mac.

If the file must be both compact and legible, the honest answer is to record less: a shorter clip, a smaller region, or two separate recordings instead of one long one.

Questions

Why is my five-minute screen recording 1 GB?

Because it captured a Retina display at native resolution with a high bitrate, and probably included motion such as scrolling or a video playing. Trim it and export at 1080p, and it will drop dramatically.

Does exporting at 720p make text unreadable?

For a full-screen Retina recording, 720p is well under half the resolution in each dimension, and ordinary interface text becomes hard to read. Stay at 1080p and reduce bitrate instead, or record a selected portion.

Can I reduce the size without any quality change at all?

Trimming in QuickTime and choosing File > Save (rather than Export) removes time without re-encoding, so the remaining seconds are untouched. Beyond that, any reduction involves re-encoding, and the question is only whether the difference is visible. For screen content at 1080p and a sensible bitrate, it usually is not.