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Discord & Slack Emoji Resizer

Turn any image into a 128×128 custom emoji for Discord and Slack — zoom and drag to frame it, then download an optimized PNG with the file size shown.

Resize and crop any picture into a custom emoji that fits Discord and Slack. Drop in an image, zoom and drag to frame the part you want, and it renders a clean 128×128 PNG. It works as a Discord emoji resizer, a Slack emoji maker and a general custom emoji tool, and it shows the output file size so you can confirm it stays under Slack’s 128 KB limit before you upload. Keep a transparent background or fill it with a color. The emoji is built on your device, so nothing is uploaded.

Drop images here

PNG, JPG or WebP — square images work best — processed privately on your device

How it works

  1. 1

    Drop an image

    Add any picture — a logo, a face or a drawing. Square images need the least cropping.

  2. 2

    Frame it

    Zoom in and drag to center the part you want, and choose a transparent or filled background.

  3. 3

    Download the emoji

    Save the 128×128 PNG. The file size is shown so you know it fits Slack’s limit.

Instant & 100% private — nothing is uploaded

Your images are processed instantly on your own device and are never sent to a server — so there are no upload waits, no size limits from us, and no copies kept anywhere.

Frequently asked questions

What size are Discord and Slack emoji?
Both use small square images. This tool outputs 128×128 pixels, which uploads cleanly to Discord and Slack and shows crisply in chat.
What is Slack’s file size limit?
Slack rejects custom emoji over 128 KB. The tool shows the current file size and flags whether it is under the limit, so you can check before uploading.
Can I keep a transparent background?
Yes. Transparent areas stay transparent in the PNG, which looks best in chat. If you prefer, you can fill the background with a solid color instead.
How do I upload the emoji?
In Discord, open Server Settings then Emoji and add the file. In Slack, open the emoji picker, choose “Add Emoji”, and upload the PNG.
Is my image uploaded to make the emoji?
No. The resizing and cropping happen in your browser, so your picture never leaves your device.

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