Custom Emoji Size Guide for Slack, Discord, Twitch & More (2026)

Every chat app has its own rules for custom emojis — get the size wrong and your emoji shows up blurry, cropped, or rejected on upload. This guide lists the recommended dimensions and file limits for the apps people use most, and how to export an emoji that stays sharp at tiny sizes.

The short version: design at a high resolution with a transparent background, keep one clear subject, and export a PNG (or GIF for animation). Every emoji from our generator already comes out as a high-resolution transparent PNG, so you can resize down to any of the targets below.

Recommended sizes by platform

• •Slack — 128×128 px, under 128 KB (PNG or GIF).
• •Discord — 128×128 px, under 256 KB (PNG or GIF; animated needs a boosted server or Nitro).
• •Twitch — upload at 112×112, plus 56×56 and 28×28 px versions (transparent PNG).
• •Telegram — 512×512 px transparent PNG for stickers and custom emoji.
• •WhatsApp — 512×512 px transparent image for stickers.
• •Microsoft Teams — square transparent PNG; works across messages and reactions.
• •Reddit — square transparent PNG for subreddit comment emoji.

How to keep an emoji crisp at small sizes

• •Use one clear subject — busy scenes turn to mush at 28–128 px.
• •Keep strong contrast and bold shapes so it reads in the picker and as a reaction.
• •Always export with a transparent background so it sits cleanly on light and dark themes.
• •Start from a high-resolution source and scale down — never scale a small image up.