Slack Emoji Resizercustom workspace emoji in one click

Turn any photo, logo or meme into a 128×128 Slack custom emoji — square, small and with transparency kept. Free, batch friendly, and images never leave your browser (safe for internal screenshots).

Drop your emoji here

PNG · JPEG · WebP · GIF — or paste from clipboard

Slack Custom Emoji, the Short Version

Square, 128×128, small file

Slack scales custom emoji down to fit chat, and rejects files that are too large. A square 128×128 export with a small file size uploads cleanly every time — that's exactly what the preset above produces.

Design for tiny

In messages your emoji renders at roughly stamp size. Faces, logos and single bold shapes read well; dense screenshots and long text don't. Crop tight to the subject before you drop it here.

How to add it to Slack

Download the export, then in Slack: click the emoji picker → Add emoji → upload the image and give it a :name:. Workspace admins can allow or restrict who adds custom emoji.

Animated Slack emoji

Slack supports animated GIF emoji — drop a GIF and it's resized frame-by-frame with the timing preserved. Keep animations short and simple so the file stays small enough to upload.

FAQ

Why did Slack reject my emoji?

Usually the file is too large or not square. Exports from this page are square 128×128 with compressed file sizes, which resolves both of the common rejection reasons.

Is it safe to use with internal images?

Yes — resizing happens entirely in your browser. Nothing is uploaded to any server, so inside jokes based on internal screenshots stay internal.