Crop, Fit, and Pad apply to both single and batch static uploads.
Drag & drop static emote images
PNG, JPEG, WEBP — up to 5 files
Slack recommends small square custom emoji files, ideally under 128KB, with transparent backgrounds for the cleanest result. Use Custom mode to create a square emoji export, then upload it through your Slack workspace emoji settings.
Slack Custom Emoji Specs
Small square emoji guidance for Slack workspace uploads
This page prepares the emoji file only. Upload permissions and emoji management happen inside the Slack workspace.
Prepare Small Workspace Emoji
Create compact square emoji files that remain readable inline and stay light enough for Slack-style uploads.
Slack custom emoji
Resize artwork into a small square emoji file for workspace reactions.
Transparent PNG emoji
Preserve alpha edges so the emoji blends into light and dark message backgrounds.
Discord to Slack emoji
Adapt an existing Discord-style emoji into a compact workspace-friendly file.
Tiny text check
Avoid small lettering and wide empty padding because inline emoji displays very small.
How to Resize Slack Custom Emojis
Prepare compact square emoji files for Slack workspace uploads.
Start with a Simple Image
Slack custom emoji display inline and small, so choose a bold face, symbol, logo mark, or reaction.
Set a Square Custom Size
Use Custom mode to create a square output suitable for Slack-style emoji use.
Preserve Transparent Edges
Use PNG when the emoji should not have a visible square background.
Keep the File Light
Simpler images compress better and are less likely to hit workspace upload limits.
Upload to Slack
Add the downloaded file through your workspace's custom emoji settings if you have permission.
💡 A Slack emoji should read instantly at inline size. If it depends on small text, simplify the artwork before uploading.
Slack Emoji Tips
Use Bold Shapes
Slack emoji display inline, so faces, icons, and simple marks work better than detailed screenshots.
Keep Files Small
Simpler PNGs are easier to upload and render quickly in workspace conversations.
Use Transparency for Cutouts
Transparent backgrounds make custom emoji feel native beside text.
Avoid Tiny Words
Most text becomes unreadable at Slack emoji size unless it is a very short, bold mark.
Continue With the Right Preset
Use these related tools and guides when the same artwork needs another platform size, file limit, or upload workflow.
Three Steps to Slack Custom Emoji
Upload Emoji Art
Drop a small emoji source, icon, reaction image, or Discord-style emoji you want to adapt for Slack.
Tighten the Square Crop
Remove excess transparent padding so the custom emoji does not look tiny inside messages.
Download Workspace Emoji
Save the compact PNG and upload it through your Slack workspace custom emoji settings.
Built for Slack Custom Emoji
Prepare compact square emoji files that stay readable inline in workspace messages.
Small Square Emoji
Resize artwork into a compact workspace emoji format.
Transparent PNG Edges
Keep emoji cutouts clean on different message backgrounds.
Inline Readability
Check that the emoji is recognizable at small text-line size.
Tight Square Crop
Remove excess transparent padding so the emoji does not look tiny.
Static-First Output
Create lightweight PNG files for reliable workspace uploads.
Adapt Existing Emoji
Resize Discord-style or creator emoji into a Slack-friendly file.
Frequently Asked Questions
Ready to Resize Your Chat Asset?
Upload your source file, crop it to the right square, and download an upload-ready PNG or GIF.
Start Resizing Now