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 no watermark, 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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Pick the Crop lane
Choose Crop (the 🔲 button) in the task row. 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 — watermark-free. Staged several clips? It crops each one in the same batch.
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 | Yes | Yes | Yes | Often watermarked |
| Price | Free during beta | 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 watermark, nothing leaves your device.
Download Crisp for MacApple Silicon · macOS 12+ · Notarized
FAQ
How do I crop a video on a Mac for free?
Use Crisp: drop your clip in, pick the Crop lane (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 and no watermark.
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.