A Mac is the opposite of a Chromebook here: the problem is not a lack of tools, it is that the obvious answer — install iMovie — is a multi-gigabyte download and a media library you now own, in exchange for removing eleven seconds from a screen recording.
Most of the time you do not need it. Here is what is already on the machine, where each option stops, and what to use when they all stop.
QuickTime Player, for the ends
Open the file in QuickTime Player, then Edit → Trim (⌘T). A yellow bar appears around the timeline with a handle at each end. Drag them inward to the part you want to keep, press Trim, and save.
That is the fastest route to “cut the dead air off the front and the back”, and it is on every Mac already. What it gives you is a new .mov file — worth remembering if the clip is going to someone on Windows or Android, because a MOV plays elsewhere only if the codec inside it is one that platform supports.
QuickTime Player, for a section in the middle
Less well known: QuickTime can do this too, with Edit → Split Clip (⌘Y). Position the playhead where the unwanted section starts, split, position it at the end of that section, split again, click the middle segment and press Delete. Then File → Export As to write the result out.
It genuinely works. Two things make it wear thin. It is a lot of pointing for one cut, and the arithmetic gets worse with every additional one — three cuts means six splits and three deletions on a strip of thumbnails with no numeric input anywhere. And QuickTime has no speed control at all, so “run the boring middle at 4× instead of removing it” is not on the menu.
Quick Look, when you do not even want to open an app
Select the video in Finder and press Space. The Quick Look window has a trim control, which is the same ends-only trim as QuickTime’s, one keystroke earlier. Good for lopping a few seconds off before sending a file; not a thing to build a workflow on.
Photos, if the clip came off an iPhone
Videos in the Photos library get a trim bar in the editor, and it behaves exactly like the one on the iPhone itself: the handles define what you keep. There is no way to express “delete this bit in the middle” — the same design decision, on the bigger screen.
iMovie, and what it actually costs
iMovie is free, it is genuinely capable, and it does the two things above ever so much more comfortably: multiple cuts on a real timeline, per-clip speed changes, transitions, titles.
The costs are the install size, the import step — footage goes into an iMovie library, which is a copy of your media, not a pointer to it — and an export that re-encodes at settings you mostly do not control. For a project, that is a fair trade. For one cut in one clip, you have spent more time on setup than on the edit.
Homebrew and FFmpeg, if you have a terminal open
brew install ffmpeg gives you the tool every other tool is built on, and cutting on a keyframe boundary with -c copy is genuinely lossless and nearly instant. If you already live in a terminal this is the best answer on this page, full stop. If you do not, installing a package manager to trim a video is its own kind of overkill.
The browser route
This editor runs FFmpeg compiled to WebAssembly inside the tab. Nothing is installed, nothing is uploaded, there is no account and no watermark, and the file is read off your disk, edited in the page and handed back as a download.
To take a section out of the middle:
- Drop the video onto the drop zone, or click it and pick the file.
- Scrub to where the unwanted part starts.
- Right-click the timeline and choose Cut, or press + Add edit.
- Drag the handles over exactly what should disappear — or type the start and end seconds, which is the part QuickTime cannot do.
- Stack more edits if you need them: further cuts, a speed-up over a slow stretch, a slow-down over a fast one.
- Press Apply All Edits and download the result.
However many edits you queued, they are applied in a single pass, so the footage is re-encoded once.
Three Mac-specific details
Your screen recordings are .mov. Everything ⇧⌘5 produces is QuickTime video, and so is everything the Photos app hands over from an iPhone. That is ideal on Apple hardware and a coin toss anywhere else, which is why the output format control here defaults to MP4 — or, if the only thing you need is the container swapped, MOV to MP4 has its own page and an explanation of why it re-encodes rather than remuxes.
Apple Silicon is quick at this. An M-series Mac chews through an in-browser encode faster than most laptops, so the practical ceiling is memory rather than patience: the input, the working buffers and the output all sit in the tab at once. The limits are here.
The first run downloads about 32 MB of WebAssembly engine, cached afterwards. Safari and Chrome both run it; the engine’s multi-threaded build needs the cross-origin isolation headers this site sets, and falls back to a single-threaded build when it cannot have them.
Which to choose
| Situation | Best option |
|---|---|
| Trimming the ends of a clip | QuickTime’s ⌘T, or Quick Look from Finder |
| One section out of the middle, once | QuickTime’s Split Clip, if you do not mind the clicking |
| Several cuts, or exact timecodes | Browser editor — type the seconds, stack the edits, one export |
| Speeding up or slowing down a section | Browser editor, or iMovie if it is already installed |
| A real project with titles and transitions | iMovie — this is what it is for |
| You have a terminal and the cut is on a keyframe | FFmpeg with -c copy |
| The recording is sensitive | Anything local. What the browser does and does not send is verifiable in DevTools |
The honest summary: on a Mac, reach for QuickTime first, because it is already open and it handles the common case. Reach past it when you want a section gone from the middle without the click-splitting, when you want to type a timecode instead of dragging at a thumbnail, or when a speed change is part of the job — and reach for the full pipeline documentation if you want to know exactly what happens to the file before you trust it with one.