Slack-ImgProxy
Slack's link preview fetcher.
- Operator
- Slack
- In the user agent
Slack-ImgProxy- robots.txt token
- none
- Follows robots.txt
- says it does not follow robots.txt
- Official documentation
- api.slack.com
- Checked on
- 2026-11-11
What is Slack-ImgProxy?
Slack-ImgProxy is Slack's link preview fetcher. It loads a page to show its preview when a link is shared in a chat or social network.
The operator's description: Fetches and caches images posted in Slack channels.
(api.slack.com)
How do I block or allow Slack-ImgProxy?
Slack-ImgProxy has no robots.txt token of its own. Slack says it does not follow robots.txt. Controlling its access means recognising its verified identity at the edge (CDN or server).
How do I see whether Slack-ImgProxy visits my site?
In your server or CDN access logs, look for Slack-ImgProxy in the user agent. Google Analytics does not show these visits: agents do not run its JavaScript.
Anyone can copy the name in a user agent, so counting log lines is not enough. Knocklog reads your site's traffic on any host, confirms who is who, and shows how often Slack-ImgProxy came, which pages it read and what that brought you.
How do I know it is really Slack-ImgProxy?
Slack does not publish a way to verify Slack-ImgProxy. Any program can use that name, so Knocklog shows these visits as “unverified”, never as genuine.
Does Slack-ImgProxy visit your site?
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Other Slack agents
- Slackbot-LinkExpanding Link preview fetcher
- Slackbot Link preview fetcher