Does compressing change the video's size on screen?

No — the dimensions (resolution) stay the same. Crisp shrinks the FILE size by re-encoding at a lower bitrate with HEVC, so the picture looks the same but the file is much smaller. That's different from resizing/downscaling, which changes the pixels.

How small will the file get?

It depends on the level and the source. Small file targets about 30% of the clip's own bitrate, Balanced about 50%, Best quality about 70%. On a typical over-bitrated clip that's roughly a third to two-thirds of the original size. Because it targets the SOURCE's own rate, the output is genuinely smaller — and an already-efficient clip is left alone rather than grown.

Is my video uploaded to a server?

No. Crisp compresses entirely on your Mac, so there's no upload, no queue, no size cap, and your footage never leaves the device — unlike the "compress video online" tools.

Will it work for emailing a video that's too big?

Yes — that's the main use. Pick Small file to get well under common email/upload limits while keeping the resolution. If it's still too big, trim it shorter too.

Guide · Compress video on Mac

How to compress a video on a Mac

Trying to email or upload a clip and it's too big? You don't need to drop the quality to something unwatchable, and you definitely don't need to upload it to a sketchy website. Here's how to compress a video on a Mac in one tap, 100% offline: the picture keeps its size, and there's no account, no upload, no watermark.

Updated July 2026 · step-by-step

The fastest way: just ask

Crisp has a plain-English box ("Or just tell Crisp what to do…"). Drop your video in and type it:

shrink the file size — compress it, balanced
make the file smaller — same thing, one tap
it's too big to email — compress for sending
compress it as small as possible — most aggressive

Crisp reads the request, switches to the Compress lane, and you just press the button.

Step by step: the Compress lane

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.
Pick the Compress lane

Choose Compress in the task row.
Choose how much

Pick Small file (most aggressive), Balanced, or Best quality. Crisp re-encodes at a fraction of the clip's own bitrate using HEVC — the dimensions stay the same.
Save

The smaller .mp4 lands beside your original, watermark-free. If a clip is already small, Crisp tells you rather than making it bigger.

Smaller file, same resolution — and never bigger

Compressing is not the same as resizing. Crisp keeps the pixels (a 1080p clip stays 1080p) and just lowers the bitrate, so the file shrinks while the picture looks the same at a glance. The three levels target roughly 30% / 50% / 70% of the clip's current bitrate — and because it measures the source, the output is genuinely smaller. An already-efficient clip is left alone, so “compress” never accidentally grows a file. Still too big for email? Trim it shorter too.

Compress vs resize (downscale)

Two different ways to make a video "smaller" — pick by what you actually need:

Compress — shrink the file size, keep the resolution. For emailing/uploading a clip that's too big. That's this guide.
Resize / downscale — actually make the picture smaller (e.g. 4K → 1080p). Use Reframe for aspect changes, or set a lower target in Enhance.

Crisp vs iMovie vs online compressors

	Crisp	iMovie	Online compressors
One-tap "make the file smaller"	Yes (3 levels)	No direct file-size control	Yes
Keeps the resolution	Yes	Depends on export	Often downscales
Plain-English request	Yes	No	No
100% offline, nothing uploaded	Yes	Yes	Uploads your clip
Won't inflate an already-small clip	Yes (refuses)	—	—
Price	Free during beta	Free	Free + upsell / size caps

iMovie's "Share" export gives quality presets but no direct file-size target; online tools upload your footage and often downscale it. Crisp targets the file size, keeps the resolution, and stays local.

Why offline matters for compressing

Your footage stays yours. The "compress video online" tools upload your clip first. Crisp does it entirely on your Mac.
No size cap, no queue. Local means the whole file, however big, right now.
Fast. HEVC hardware encoding on Apple Silicon.
Stack it. Trim first, then Compress — all on-device.

Make it smaller — offline

Free to try on your Mac. One tap to shrink a video for email or upload — no account, no upload, nothing leaves your device.

Download Crisp for Mac

Apple Silicon · macOS 12+ · Notarized

FAQ

How do I compress a video on a Mac for free?

Use Crisp: drop your clip in, pick the Compress lane (or type "shrink the file size"), choose a level, and press it. It shrinks the file on your Mac — no account, no upload, no watermark.

Does it change the resolution?

No — the dimensions stay the same. Crisp lowers the bitrate (HEVC), so the file is smaller but the picture looks the same. That's different from resizing.

How small will it get?

Small file ≈ 30% of the clip's bitrate, Balanced ≈ 50%, Best quality ≈ 70% — so roughly a third to two-thirds of the original on typical footage. Already-small clips are left alone.

Is my video uploaded anywhere?

No — it's compressed entirely on your Mac, so there's no upload, no queue, no size cap.