Slack Image Prep Tool

Crop, convert, and compress images for Slack-ready uploads.

Upload a common image type, choose a Slack-focused preset, fine-tune the crop and export settings, and preview how an emoji will actually read inside a Slack chat before you download it.

Buy me a coffee

Drop an image to start

PNG, JPEG, WEBP, and GIF accepted. GIF → GIF keeps animation; other formats use one frame.

Crop workspace

Frame the subject first. The export preview updates from this crop.

1:1 crop

Upload an image to unlock crop, compress, convert, and preview tools.

AspectZoom

Preset and export

PresetSquare transparent export optimized for Slack custom emoji.Output formatExport size

Compression qualityPNG ignores the lossy quality slider and preserves crisp edges.Background fill

Keep the subject bold and centered so it survives tiny in-chat rendering.

Transparent PNG works best for emoji-style assets.

Processed preview

This is the actual browser-generated export that will be downloaded.

Your processed export preview will appear here.

Validation

PresetSlack emoji

Dimensions--

FormatPNG

Status--

Under 128 KBCheck

Allowed format for Slack emojiCheck

Export dimensions generated successfullyCheck

Slack preview

Use this to judge readability at actual chat scale before exporting.

Emoji view

Light chat

Dusti 10:42 AM

ship ittoday

Dark chat

Dusti 10:42 AM

ship ittoday