Capture visual snapshots of links shared in Slack
Review the page itself without opening every link or losing its original state.
Trigger
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Action
Capture webpage screenshot
Tool to capture a screenshot of a webpage. Use when you need a visual snapshot of a URL.
Why this helps
Shared links get buried, change later, or require extra context switching to inspect.
- Preserves the page state at share time
- Speeds up link review
- Creates visual context for async work
Setup
Build it in a few focused steps.
- 1Connect Slackbot and Customjs in Notis.
- 2Create an automation named Channel Link Snapshot.
- 3Tell Notis to detect a URL in each channel message and capture a webpage screenshot with a short caption.
- 4Pick Channel Message Received as the trigger and choose where reports go.
- 5Post one test URL in a channel.
Questions about this workflow
What if a message has no URL?
Tell Notis to skip it and report only messages containing a usable webpage URL.
Can it capture authenticated pages?
Only if the connected Customjs browser session can access them.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slackbot to Customjs. A trigger fires from one place; an action lands in another.
Slackbot triggers
Customjs actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Authenticate CustomJS API Key
Tool to authenticate a CustomJS API key. Use when verifying a user's API key before making further requests.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Convert HTML to PDF
Tool to convert HTML to a PDF document. Use when you need to generate a PDF from raw HTML. Returns raw PDF bytes suitable for download or storage.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Convert HTML to PNG
Tool to convert HTML string to PNG image. Use when you need a PNG from HTML after preparing your markup.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Capture webpage screenshot
Tool to capture a screenshot of a webpage. Use when you need a visual snapshot of a URL.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Merge multiple PDFs into one
Tool to merge multiple PDF files into a single PDF. Use when you have multiple PDF URLs and want one combined PDF.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Run Puppeteer Script
Tool to run a Puppeteer script and capture a screenshot. Use when automating headless browser tasks and needing a PNG output. Use after confirming the script logic.
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.
Slackbot and Customjs, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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