HTML to Image API + Slack Integration

Why connect them

The HTML to Image API in Slack.

Slack is where work happens for millions of teams. Integrating APIs with Slack enables intelligent notifications, automated alerts, and data-rich messages. Transform your channels into real-time dashboards and keep your team informed with contextual, actionable information.

What you can build

Workflows worth wiring.

Send instant alerts when a monitored website's SSL certificate is expiring

Post daily weather forecasts to team channels for field workers

Notify sales teams when a lead's email is validated as deliverable

Alert DevOps when DNS changes are detected on critical domains

Templates

Ready-made ideas.

New message in channel Render HTML template → post downloadURL

Generate image from Slack message data

Extract data from a Slack message, render it into an HTML template, and post the downloadURL back to the channel as a generated image.

Slash command triggered Render HTML → share downloadURL in channel

Create team announcement graphics

Use a slash command to generate branded announcement images. Post the downloadURL with the image dimensions width x height.

Setup

Connect it in a few steps.

Set up with Zapier

1
Set the trigger. Create a Zap with Slack as the trigger app and "New message" as the event. Connect your account.
2
Add the API action. Add APIVerve as the action, select the HTML to Image API, and map your trigger data to the request.
3
Send it back. Add a second Slack action for "Send message" and map the returned fields (like imageName) into it.
4
Test & turn on. Test the Zap with real data to confirm the mapping, then turn it on.

Set up with Make

1
Add the trigger. Create a scenario and add a Slack module set to "New message". Authenticate your account.
2
Call the API. Add an HTTP module pointing at api.apiverve.com/v1/htmltoimage with your x-api-key header. Pass the trigger's data as the input.
3
Parse & map. Add a JSON module to read the response, then a Slack module for "Send message". Map fields like data.imageName into place.
4
Activate. Run once to confirm the mapping, then switch the scenario on and set its schedule.

Set up with n8n

1
Add the trigger node. Start a workflow with a Slack trigger node for "New message" and connect your credentials.
2
Add an HTTP Request node. Point it at api.apiverve.com/v1/htmltoimage using Header Auth (x-api-key). Feed in the trigger data.
3
Map with expressions. Add a Slack node for "Send message" and reference the response with expressions such as {{ $json.data.imageName }}.
4
Execute & activate. Execute manually to verify, then activate the workflow for production.

The payload

What Slack receives.

imageName"79c8416d-8096-4524-adea-a948eb69a21e.png"

format".png"

downloadURL"https://storage.googleapis.com/apiverve/APIData/htmltoima…"

expires1766010253596

htmlLength197

dimensionswidth, height

HTML to Image API + Slack