Does Slack Compress Images?

Slack seems to be the go-to software for most modern companies nowadays. Don’t you just hate it when images you send to people are low quality because they’ve been compressed? Well today, I’m going to help you answer whether or not Slack compresses images.

Slack doesn’t compress images whatsoever on desktop or mobile apps. It does however cut thumbnails for certain images on mobile apps, but this doesn’t affect image quality. In addition, there is a free add-on for Slack which allows you to compress images.

Why Slack doesn’t compress images

Slack don’t compress images as they know that it can ruin certain critical information on the images such as a screenshot or small text. They want their users to be able to rely on Slack as a clear form of communication.

Standard Image vs Compressed Image

Slack, take the stage

I had a browse on Twitter and came across a comment from the official Slack Twitter account regarding this query, here’s what they had to say:

How to compress images on Slack

To compress images on Slack, follow the instructions below.

  1. Open Slack
  2. Sign in
  3. Install the Tinybeest app on Slack
  4. Activate the app
  5. Compress images on-the-fly


I hope you found this guide useful. If you have any questions about Slack image compression, feel free to leave them below and I’ll do my best to answer.