Prepare a GIF for your platform
Platform limits and recommended compression targets are different. Check the limit shown in your account before uploading.
| Slack | Custom emoji need a small file and a short animation; file size alone is not enough.
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How to use this tool
- Choose a GIF or drop it into the tool. The 100KB target is already selected.
- Run compression and compare the output size with your destination's allowance.
- Preview the animation, especially small text, edges, and moving details.
- Download the result. If it misses the target, use the offered smaller-width retry or prepare a shorter source animation.
When a 100KB GIF makes sense
A tiny reaction, a blinking icon, or a few frames of simple artwork can justify a tight file budget. At this size, the important question is whether the animation still communicates its message. A long screen recording is a poor starting point when viewers need to read every label.
Use this target when you have a real size allowance or want to keep a small visual lightweight. It is a starting point for Slack emoji, but Slack also checks animation requirements that compression alone cannot solve.
What changes during compression
The compressor optimizes the GIF and can reduce color detail to pursue the target. It keeps the animation's frames, timing, and loop behavior. Reducing the file size may make gradients rougher or small lettering harder to read, so compare more than the first frame.
The tool does not automatically crop the picture, shorten the clip, or remove frames. Those are separate editing decisions if your source contains more animation than this budget can reasonably hold.
If the result is still above 100KB
Read the actual output size rather than treating the selected target as a guarantee. When the target is missed, you can explicitly retry at 80% width. That makes the image smaller on screen as well as reducing the amount of visual information to encode.
If the animation loses its meaning at that size, shorten it in an editor and upload the new GIF. If your destination allows a larger file, try 256KB instead of sacrificing essential detail.
Check the file and the destination
CompressGIF uses decimal units: 100KB means 100,000 bytes. Another app may display the same file differently. Leave some room below an upload cap and check any separate limits on dimensions or frame count.
GIF contents are processed in your browser and do not need to be uploaded to CompressGIF. The free plan accepts up to three GIFs per batch, each up to 10MB.
Frequently asked questions
Will every GIF fit under 100KB?
No. Long, detailed, or large-dimension animations may remain above the target. The result shows the actual size so you can decide whether to retry, edit the source, or use a larger allowance.
Is the 100KB target free?
Yes. The fixed 100KB, 256KB, 512KB, and 1MB targets are free. A custom target is a Pro feature.
Can I use this to make a static image into a GIF?
No. This tool compresses existing GIF files. It does not create an animation from a photo or convert a video.
Does a 100KB GIF automatically qualify as Slack emoji?
No. Slack also has a frame limit and workspace permission rules. Check the Slack guide before uploading your compressed file.