Make pending PDF reviews easy to spot
When a draft PDF appears in a Slack channel, add a visible review watermark so nobody mistakes it for a final document.
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
Watermark PDF
Tool to apply a text watermark to a PDF. Use when you need to annotate PDF pages with custom labels or marks; supports page selection, positioning, opacity, and rotation.
Why this helps
Draft files can be mistaken for approved versions when their status lives only in a busy Slack thread.
- Make draft status visible on the document itself.
- Reduce confusion between working copies and approved files.
- Keep the review cue attached as the PDF is shared.
Setup
Build it in a few focused steps.
- 1Connect Slack and Encodian to Notis once in the portal.
- 2Create an automation in the portal or ask Notis conversationally to watermark channel PDFs with a review label.
- 3Pick the Slack Channel Message Received trigger and choose a channel for run reports.
- 4Test with a non-sensitive draft PDF shared in a Slack channel.
Questions about this workflow
Can the watermark be customized?
Describe the desired watermark text and placement in the automation prompt, within the options supported by Encodian.
Does it mark every Slack message?
The automation should instruct Notis to use Encodian only when the channel message contains a PDF appropriate for review.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slack to Encodian. A trigger fires from one place; an action lands in another.
Slack triggers
Encodian actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Decode Base64 String
Tool to decode a Base64 string to a file. Use when you need to extract binary content (e.g., PDF, image) from Base64 data.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Base64 Encode
Tool to encode a string to Base64. Use when you need to convert text into Base64 representation for use in other operations.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Compare Text
Tool to compare two text strings and determine if they match. Use when you have two strings and need to verify if they are equal.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Hash Data
Tool to compute a cryptographic hash (MD5, SHA256, etc.) of text or file data. Use when you need to verify integrity or generate digests.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Unzip File
Tool to extract files from an archive. Use when you need to unzip a package and retrieve its contents.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Get File Properties
Tool to retrieve properties of a file. Attempts multiple Encodian Filer endpoints and fallbacks.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Resize Image
Tool to resize an image by percentage or dimensions. Use when you need to scale or reshape an image with optional aspect-ratio enforcement.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
Move File
Tool to move a file between containers. Use when you need to relocate a blob within your storage without manually copying then deleting.
Connect any two apps with Notis in the middle.
Slack and Encodian, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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