How to crop a video on a Mac
Whether you're cutting the black bars off a letterboxed clip, tightening the frame around your subject, or zooming in a touch, cropping shouldn't need a timeline editor, an account, or an upload to some website. Here's how to crop a video on a Mac in seconds, 100% offline — Crisp even auto-detects the black bars for you — with the audio kept in sync and either by typing it in plain English or by using the Crop lane.
The fastest way: just ask
Crisp has a plain-English box ("Or just tell Crisp what to do…"). Drop your video in and type the crop you want:
- crop out the black bars — auto-remove letterbox / pillarbox
- remove the letterbox — same thing, in words
- get rid of the black bars — the picture fills the frame again
- crop in a bit (or punch in) — a centre zoom-crop
- crop the edges — tighten the frame
Crisp reads the request, shows you the plan, switches to the Crop lane and sets the mode for you — you just press the button. It's careful about intent, too: simply describing your footage ("my clip has letterboxing") won't trigger a destructive crop, and if you ask for a bigger edit in the same breath, "crop out the black bars and upscale to 4K", the bigger job takes the wheel so nothing gets dropped.
The manual way: the Crop lane
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Open Crisp and drop in your video
Get the free Crisp app for Mac and drag your clip onto the window. Nothing is uploaded: the whole job runs on your Mac.
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Ask for Crop
In Crisp, type “crop it to a square” in the prompt bar at the top — plain English maps straight to the tool, and Crisp shows you what it is about to do before it runs. It's for video clips; if you've staged a photo, Crisp will nudge you to pick a video.
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Choose a mode
Black bars auto-detects and removes letterbox / pillarbox borders. To ratio center-crops the frame to an aspect (1:1, 4:5, 9:16, 16:9, 4:3). Crop in zooms into the centre by an amount you set with a slider.
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Press Crop
Crisp crops on-device with hardware encoding, keeps the audio in sync, and saves the result beside your original: one-time. Staged several clips? Crisp Pro crops each one in the same batch (batch is part of the one-time $129 Pro unlock; one file at a time is free).
Black bars? Let Crisp find them
You don't have to eyeball where the picture ends and the bars begin. Crisp runs a quick detection pass that samples the clip (skipping a fade-from-black intro so it isn't fooled), finds the real content rectangle inside the letterbox or pillarbox, and crops to it — snapping the crop to even dimensions so the encoder stays happy. Type "crop out the black bars" and it just works.
Crop vs Reframe — which do you want?
Crisp has two ways to change what fills the frame, and they're deliberately different:
- Crop trims the edges away. Use it to remove black bars, tighten around your subject, or zoom in. Something leaves the frame.
- Reframe keeps the whole picture and fits it inside a social aspect like 9:16 with a blurred fill behind it. Nothing is cropped. Use it to make a clip vertical for Reels/TikTok without losing any of the shot.
Rule of thumb: reaching for "make it vertical" or "for TikTok" → Reframe. Reaching for "cut the bars off" or "crop in" → Crop.
Crisp vs iMovie vs QuickTime vs online croppers
| Crisp | QuickTime | iMovie | Online croppers | |
|---|---|---|---|---|
| Auto-detect & remove black bars | Yes — one click | No | Manual | Manual |
| Plain-English request | Yes | No | No | No |
| Keeps the audio in sync | Yes | Yes | Yes | Varies |
| Crop + enhance in one step | Yes | No | No | No |
| 100% offline, nothing uploaded | Yes | Yes | Yes | Uploads your clip |
| No watermark | With Pro ($129) | Yes | Yes | Often watermarked |
| Price | Free tier + one-time $129 | Free | Free | Free + upsell |
QuickTime has no crop at all; iMovie can crop but only by manual drag and has no bar-detection; online croppers upload your footage to someone's server. For a precise, private crop, and automatic bar removal, Crisp does it locally.
Why offline matters for cropping video
- Your footage stays yours. The web "crop video online" tools upload your clip first. Crisp crops it entirely on your Mac — nothing leaves the device.
- No queue, no size cap. Cloud croppers throttle by file size and make you wait; Crisp works on the whole file locally.
- Bars gone automatically. The black-bar detection is the part manual tools make you do by hand — Crisp does it for you.
- The audio is done right. Cropping changes only the framing; the sound is carried through in sync.
Crop your first clip — offline
Free to try on your Mac. Remove black bars, tighten the frame, zoom in — no account, no subscription, nothing leaves your device.
Download Crisp for MacApple Silicon · macOS 12+ · Notarized
Cropping questions
How do I crop a video on a Mac for free?
Use Crisp: drop your clip in, select the clip and type it in the prompt bar (or type "crop out the black bars" or "crop in a bit"), choose the mode, and press Crop. It crops the clip and keeps the audio in sync, entirely on your Mac, with no account, no upload.
How do I remove black bars / letterbox from a video?
Use the Crop lane's Black bars mode, or type "remove the letterbox". Crisp auto-detects the content rectangle inside the bars and crops to it, so the picture fills the frame again — no manual dragging.
What's the difference between Crop and Reframe?
Crop trims edges away (and removes bars). Reframe keeps the whole picture and fits it inside a social aspect with a blurred fill. Cut edges off → Crop; make it vertical without losing the shot → Reframe.
Does cropping re-compress the video?
Cropping re-encodes the picture, but Crisp hardware-encodes at high quality on Apple Silicon and writes the file locally and atomically, so the loss is negligible and you can check the result immediately.
Can I crop a photo?
The Crop lane is video-only for now. If you've staged a photo, Crisp will point you to a video clip.
Related guides
Add a border · Make a video vertical · Trim a video · Upscale a video
Background: what changing the frame shape costs.