How Long Is a 10 MB Video?

Estimate how many seconds fit in a 10 MB MP4 or MOV at 720p and 1080p, and what to change when you need a smaller video.

By Petr Samokhin June 26, 2026

The form says max 10 MB. You have a three-minute screen recording. Will it fit, or do you need another export?

Ten megabytes is a byte budget, not a quality label. How much video fits depends on bitrate, resolution, duration, and how hard the footage is to encode.

Why 10 MB shows up so often

Many email gateways, job portals, and school forms cluster around 10 to 25 MB caps. People search for 10 MB when planning an attachment. Full context: email attachment size limits .

Read the live form. Help pages from last year may list 5 MB, 10 MB, or 20 MB for the same product on different plans.

The math behind video file size

Approximate size in megabytes:

(video Mbps + audio Mbps) × seconds ÷ 8

Example: 4 Mbps video + 0.128 Mbps audio for 60 seconds:

(4.128 × 60) ÷ 8 ≈ 31 MB

To fit 10 MB in 60 seconds, total bitrate needs to sit near 1.3 Mbps. That is tight for 1080p and more realistic for 720p talking-head content.

Primer: what is video bitrate . For planning before you shoot, see the video file size calculator .

Rough duration at common settings

Rules of thumb for H.264 MP4 with about 128 kbps audio. Your results will vary.

Settings	Approximate duration in 10 MB
720p, ~1.5 Mbps video	~50 to 70 seconds
720p, ~2.5 Mbps video	~30 to 45 seconds
1080p, ~3 Mbps video	~25 to 35 seconds
1080p, ~5 Mbps video	~15 to 22 seconds
480p, ~1 Mbps video	~70 to 90 seconds

HEVC (H.265) at similar visual quality can stretch those durations, often by roughly 30 to 50 percent, if recipients can play it. See H.264 vs H.265 .

Portrait phone video at 1080p uses the same pixel count as landscape. Duration math still applies; small text may need more bitrate to stay readable.

Content that breaks the estimate

Harder to compress (shorter runtime in 10 MB):

Screen recordings with small UI text
Sports, rain, foliage, confetti
Noisy low-light phone footage
60 fps action versus 30 fps slides

Easier to compress (longer runtime in 10 MB):

Talking head on a plain background
Slides with long pauses
Locked tripod shots with little motion

Two clips with the same resolution can differ by 2x in size. Always preview text legibility, not only the duration table.

How to fit a clip under 10 MB

Work in this order:

Trim intro and outro dead air.
Drop to 720p if full HD is not required.
Lower frame rate from 60 to 30 for screen captures.
Prefer H.264 for compatibility unless you know recipients decode HEVC.
Lower quality or bitrate until the export sits under the cap.

Step-by-step exports: compress video on Mac and compress video on Windows . To hit 10 MB without trial-and-error exports, use target size on Mac or target size on Windows .

If you land at 11 MB, one more trim or a small quality step usually clears 10 MB on a laptop review.

Check size before you upload

On Mac, select the file in Finder and press ⌘I. On Windows, right-click → Properties. Compare size (not “size on disk”) to the limit.

Some forms measure after their own processing. If a 9.8 MB file still fails, try 720p or a shorter trim rather than chasing the last kilobyte.

Mute or strip unused audio when the clip is silent. Otherwise the mux still spends bitrate on an empty track.

When an estimate is enough

The tables above are enough when you are planning a recording or deciding whether a three-minute 1080p clip can ever fit.

When the portal lists an exact megabyte cap and you already have the master, set a video target file size of 10 MB (or about 9.5 MB for headroom) in GetCompress, preview, and export a copy locally. Save that preset for any form that repeats the same limit. Keep the master untouched. GetCompress is not a full editor; trim first if the story does not need the whole take.