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How to shrink an MP4 without wrecking it
A 90 MB clip will not email, will not WhatsApp, and will not upload to half the forms on the internet. Here is how to take an MP4 down to size while keeping it perfectly watchable.
Open the Video Converter — free →Step by step
- Trim first: cutting dead air at the ends is free compression — do it before anything else.
- Run the video compressor and pick a target: under 25 MB for email, under 16 MB for WhatsApp.
- If it is still too big, drop the resolution one step (1080p → 720p is barely noticeable on phones).
- Convert the result to MP4 if it is not already, and send it.
Tips from people who do this a lot
- Compression cost rises steeply with motion: talking-head clips shrink beautifully, sports clips resist — give action footage a bigger target.
- Shrink a copy, never your only original.
- A one-minute 720p clip at sensible settings lands around 8-15 MB — plan targets around that reality.
FAQ
Why does my compressed video look soft?
The target was too small for the content. Raise the target size or lower the resolution deliberately instead of squeezing both.
What is the WhatsApp video limit?
About 16 MB for a normal send — compress to 15 MB to be safe.
What CRF should I use to shrink a video?
Start around CRF 23–28 for H.264; lower values keep more quality and larger files, while higher values shrink more with visible loss. The right value depends on content and target size, so test a short clip first. Uploads are capped at 200 MB and fair-use limits apply.
Does a higher CRF always make the file smaller?
Generally yes, but not linearly, and very high CRF can cause blocking or smearing. The encoder, resolution, and audio settings also affect final size. Files are deleted after processing, and no sign-up is needed.
Is this really free?
Yes — every tool on this site is free. A short ad before your download is what pays the server bills, so nothing needs a paywall or an account.