How to compress MP4 videos before sharing them online

Large MP4 files are still one of the small workflow problems that slow down everyday sharing. A video may look fine on your phone, but it can be too large for email, Discord, Slack, support tickets, product demos, or quick client review.

A simple way to handle this is to compress the file in the browser before you upload it anywhere. CompressMP4 is a free browser MP4 compressor that lets you reduce video size with either a percentage target or a target MB value.

The useful part is control. If you need a quick smaller copy, choose a percentage. If a platform has a hard limit, such as 8 MB, 25 MB, or 100 MB, use the target-size mode and export a file that is easier to share.

This is most helpful for creators, support teams, indie makers, students, and anyone who wants a smaller MP4 without first installing a desktop editor. For sensitive or private clips, still review the tool behavior and your own privacy requirements before using any web workflow.

Typical use cases:

  • Make a product demo small enough to attach to an email.
  • Reduce a screen recording before sending it in a support ticket.
  • Create a smaller social preview from a longer MP4.
  • Prepare a lightweight video for a landing page or documentation draft.

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