Use one reaction to request a visual
React to a Slack message when it is ready to become a graphic, and Notis can prepare the image for review.
Trigger
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Action
Convert HTML to Image
Tool to convert HTML content into an image. Returns either a downloadable file or a JSON payload containing id and url, depending on the upstream API behavior.
Why this helps
Requests for graphics get mixed into conversation, making it unclear which message is ready for production.
- Mark the specific message that should become an image.
- Avoid creating graphics from every channel post.
- Keep the request attached to its original context.
Setup
Build it in a few focused steps.
- 1Connect Slack and Html to image to Notis once.
- 2Create an automation in the portal or ask Notis conversationally.
- 3In one instruction, ask Notis to create a visual from the reacted-to message and use the chosen reaction as the request cue.
- 4Choose Message Reaction Added and pick the channel for run reports.
- 5Test by adding the agreed reaction to one real message.
Questions about this workflow
Can I use any reaction?
Use a consistent emoji and configure the Slack trigger with that reaction when available.
Does the reaction approve publication?
It requests image creation. Review the generated image before publishing or sharing it externally.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slack to Html to image. A trigger fires from one place; an action lands in another.
Slack triggers
Html to image actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Get HTML to Image
Tool to retrieve a generated image by its ID. Use when you need to fetch, resize, or download an existing HTML to image asset.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Check HTML-to-Image Account Usage
Tool to retrieve account usage statistics including hourly, daily, and monthly image creation counts. Use after authenticating to review current usage limits and billing periods.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Convert HTML to Image
Tool to convert HTML content into an image. Returns either a downloadable file or a JSON payload containing id and url, depending on the upstream API behavior.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
Connect any two apps with Notis in the middle.
Slack and Html to image, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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No card. Works with personal or business Html to image.