Compress Images for Slack — Stay Under 1GB Limit
Quick Answer
Slack auto-compresses image previews to 64KB for inline display, regardless of the original file size. Pre-compress your image to under 500KB with FileCurve to control exactly how it looks in Slack.
Slack auto-compresses image previews to 64KB for inline display, regardless of the original file size. Pre-compress your image to under 500KB with FileCurve to control exactly how it looks in Slack.
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Frequently Asked Questions
Does Slack compress images?
Yes. Slack generates a 64KB compressed thumbnail for inline preview. Your original file is stored at full quality, but the visible preview is compressed. Upload images under 64KB if you want the original displayed as-is.
What is Slack image size limit?
Free Slack workspaces have a 5GB storage limit. Individual file uploads can be up to 1GB. For best display quality, upload images under 500KB.
How to send HD images on Slack?
Compress to under 64KB using FileCurve, or send as a file attachment (not inline) so Slack shows the full-quality original.
Last updated: April 2026