Does Slack Compress Images? + How to Compress Images for Slack | FileCurve
Quick Answer
Yes — Slack automatically compresses images when displaying them inline, often reducing quality noticeably. Pre-compress your image to under 500KB with FileCurve before uploading. You control the quality; Slack won't need to re-compress it.
Yes — Slack automatically compresses images when displaying them inline, often reducing quality noticeably. Pre-compress your image to under 500KB with FileCurve before uploading. You control the quality; Slack won't need to re-compress it.
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Frequently Asked Questions
Does Slack compress images automatically?
Yes. Slack recompresses images for inline display, often reducing quality. Pre-compressing with FileCurve before upload gives you control over final quality — Slack won't need to compress further.
What file size should I use for Slack images?
Keep images under 500KB for instant loading in any channel or DM. Slack allows up to 1GB per upload but compresses previews heavily above 1MB.
Why do my images look blurry in Slack?
Slack re-compresses images to fit its preview system. Upload a pre-compressed version at 500KB or less — the quality will be sharper because Slack won't apply additional compression.
Last updated: April 2026