Compress Video for 4K video (100 MB Limit)

Compress 3840×2160 footage in the cloud instead of making your browser hold every 4K frame in memory. Start from a 95 MB target or choose a quality preset.

Camera, drone and phone footage at 35–100 Mbps quickly becomes 500 MB–2 GB. Cloud encoding is more reliable than an in-browser WASM job for these frame sizes.

4K video file size limits, and what they really mean

A fixed upload target can force a resolution trade-off. If 4K cannot fit the duration cleanly, a strong 1080p output is better than damaged UHD.

Plan / upload methodMaximum file size
Client portal, CMS or web hero100 MB

95 MB leaves room below a common 100 MB portal cap.

Slack, Teams or Linear attachment50 MB

Use about 48 MB for a 50 MB workflow limit.

Discord Free upload20 MB

Use about 19 MB for Discord Free.

Limits verified 2026-10-28. Sources: YouTube Help — Recommended upload encoding settings · Apple Support — Record HD or 4K video with your iPhone

What 95 MB actually buys you

Every other page tells you the limit and stops there. The limit is the easy half. Here is the half that decides whether your video is watchable: at a 95 MB target, this is exactly how much bitrate is left for each duration, and the largest resolution that bitrate can carry without falling apart.

Video lengthBitrate left for videoResolution it carriesVerdict
30s25,905 kbps4KLooks fine
1 min12,888 kbps1440pLooks fine
2 min6,380 kbps1080pLooks fine
5 min2,475 kbps720pLooks fine

Method: the bitrate column is arithmetic — 95 MB spread across the duration, minus 128 kbps for stereo audio and 2% for container overhead. It is a hard ceiling, not an estimate. The resolution and verdict columns are a recommendation, derived from published H.264 bitrate ladders and pulled down about a third, because re-encoding footage that has already been compressed once survives lower bitrates than encoding a clean master does. Deliberately conservative — we would rather under-promise than tell you a video will look fine when it will not.

95 MB across lengths and resolutions

The left column is what you have to spend at each length; the cells are what each resolution needs. Green means you clear it comfortably, amber means it is watchable but soft, and grey means pick a smaller frame. Reading down a column shows how long a clip can get before that resolution stops being worthwhile on 4K video.

you haveneeded for comfortable quality1080p720p480p360p30s25,90530s at 1080p: 25905 kbps available; 4000 kbps for a comfortable result, 2000 kbps to stay watchable4,00030s at 720p: 25905 kbps available; 2200 kbps for a comfortable result, 1100 kbps to stay watchable2,20030s at 480p: 25905 kbps available; 1000 kbps for a comfortable result, 500 kbps to stay watchable1,00030s at 360p: 25905 kbps available; 600 kbps for a comfortable result, 300 kbps to stay watchable6001 min12,8881 min at 1080p: 12888 kbps available; 4000 kbps for a comfortable result, 2000 kbps to stay watchable4,0001 min at 720p: 12888 kbps available; 2200 kbps for a comfortable result, 1100 kbps to stay watchable2,2001 min at 480p: 12888 kbps available; 1000 kbps for a comfortable result, 500 kbps to stay watchable1,0001 min at 360p: 12888 kbps available; 600 kbps for a comfortable result, 300 kbps to stay watchable6002 min6,3802 min at 1080p: 6380 kbps available; 4000 kbps for a comfortable result, 2000 kbps to stay watchable4,0002 min at 720p: 6380 kbps available; 2200 kbps for a comfortable result, 1100 kbps to stay watchable2,2002 min at 480p: 6380 kbps available; 1000 kbps for a comfortable result, 500 kbps to stay watchable1,0002 min at 360p: 6380 kbps available; 600 kbps for a comfortable result, 300 kbps to stay watchable6005 min2,4755 min at 1080p: 2475 kbps available; 4000 kbps for a comfortable result, 2000 kbps to stay watchable4,0005 min at 720p: 2475 kbps available; 2200 kbps for a comfortable result, 1100 kbps to stay watchable2,2005 min at 480p: 2475 kbps available; 1000 kbps for a comfortable result, 500 kbps to stay watchable1,0005 min at 360p: 2475 kbps available; 600 kbps for a comfortable result, 300 kbps to stay watchable600

Source: Computed, not measured — no encoder was run to produce this figure · Method: 95 MB spread over the duration, minus 128 kbps audio and 2% container overhead. Thresholds come from published H.264 bitrate ladders, reduced by about a third for re-encoded source.

How to compress a video for a 4K video

  1. Drop your video in

    MP4, MOV, MKV, AVI, WebM and 33 formats in all. Nothing to install — your browser uploads over a one-time link and the file never touches a third party.

  2. The target is already 95 MB

    We pre-set it below the hard ceiling on purpose. A target-size encode usually lands within a couple of percent of the number you gave it, but we have measured footage that overshoots by up to a tenth — and landing over a hard limit means the upload fails. Change it if you want a different number.

  3. Download and upload

    Encoding runs on our servers, so you can close the tab. The result comes back with no watermark on any plan, in an MP4 that a 4K video will accept.

4K video compression FAQs

Can I compress 4K video online?

Yes. The source uploads to a cloud encoder, so your browser does not perform the full 4K encode.

Should I keep 4K resolution?

Only when the duration and target bitrate support it. Otherwise 1080p usually looks cleaner at the same file size.

Why do browser-only 4K tools crash?

Decoded 4K frames and codec memory can exceed a browser tab’s practical memory budget.

Will the output have a watermark?

No. VidSmaller does not add a watermark on free or paid outputs.

The reasoning behind these numbers

OTHER LIMITS
Same tool, a different upload ceiling