Question 1

What size should Slack emoji be?

Accepted Answer

Slack recommends emoji to be 128x128 pixels in size. While smaller images will work, 128x128 provides the best quality. Our tool automatically resizes your images to this optimal size.

Question 2

What is the file size limit for Slack emoji?

Accepted Answer

Slack emoji must be under 128KB (131,072 bytes). This is a hard limit - even 1 byte over will be rejected. Our tool automatically compresses your images to stay under this limit.

Question 3

Why is my Slack emoji upload failing?

Accepted Answer

The most common reason is file size - your image exceeds the 128KB limit. Use our tool to automatically compress your image. For GIFs, try reducing the number of frames or colors if compression alone is not enough.

Question 4

Can Slack emoji be animated?

Accepted Answer

Yes! Slack supports animated GIF emoji. However, GIFs are limited to 50 frames and must still be under 128KB, which can be challenging. Our tool optimizes animated GIFs to meet these requirements.

Question 5

How do I compress a GIF for Slack?

Accepted Answer

Our tool automatically compresses GIFs by reducing colors (from 256 down to as few as 32 if needed), skipping frames to stay under 50, and applying lossy compression. This happens automatically when you upload your GIF.

Question 6

What formats does Slack accept for emoji?

Accepted Answer

Slack accepts PNG, JPG, and GIF formats for custom emoji. PNG is recommended for static images (especially with transparency), while GIF is used for animations.

Question 7

Why do my Slack emoji look blurry?

Accepted Answer

Blurry emoji usually result from uploading images smaller than 128x128 pixels. Always start with a high-resolution source image. Our tool will warn you if your source image is too small.

Question 8

Is this Slack emoji resizer free?

Accepted Answer

Yes! Our Slack emoji resizer is 100% free with no limits. No account required, no watermarks. All processing happens in your browser for complete privacy - your images never leave your device.

Anforderung	Spezifikation
Abmessungen	128x128 pixels (recommended)
Dateigröße	Must be under 128KB
Format	PNG, JPG, or GIF
Animation	GIFs supported (max 50 frames)

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