Slack Emoji Generator
Create readable Slack reaction emoji, approval stamps, and status labels. Pick a template, adjust colors and fonts, preview the square PNG, then download it for your workspace.
PNG preview is ready.
Slack recommends square custom emoji images under 128KB, ideally with a transparent background. Your workspace settings may limit who can add custom emoji.
MojiMoon's Slack Emoji Generator turns short words into square PNG images for custom Slack emoji. It works well for team reactions such as OK, LGTM, DONE, REVIEW, THANKS, SHIP, approval labels, short status stamps, and quick replies that need to be readable in a busy Slack channel.
Use a short label, choose a strong foreground and background contrast, then download the PNG. For the cleanest result, keep the text to one or two words and preview it at 128 x 128 before adding it to Slack.
Create labels like REVIEW, WIP, DONE, HOLD, or SHIP for project updates.
Make OK, YES, NO, LGTM, APPROVED, and BLOCKED reactions for team workflows.
Use THANKS, NICE, WOW, or GREAT to make everyday chat reactions easier to scan.
One word is usually best. Two short lines can work, but long phrases become hard to read once Slack shrinks the emoji inside messages.
White text on a dark background, or dark text on a pale background, stays clearer than low-contrast color pairs.
A rounded square background gives the text a strong edge. Transparent backgrounds are useful when you want a sticker-like label.
Slack custom emoji are square images. This tool defaults to 128 x 128 PNG, which is a practical size for Slack reactions. You can also export 512 x 512 when you want a larger source image before resizing elsewhere.
Yes. Turn on transparent background before downloading. When using transparency, choose a text color that works on both light and dark Slack themes.
Some Slack workspaces restrict custom emoji uploads to owners, admins, or approved members. If the upload option is missing, check your workspace settings or ask an admin.
The download is a standard PNG, so it can often be reused in Discord, Notion, documents, or chat apps. Each service may have its own size and file limit.