Get shared images to the right size sooner
When someone shares an image for a known channel, page, or presentation use, resize it to the requested dimensions automatically.
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
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.
Why this helps
Simple image resizing breaks flow when the same edit has to be repeated for every asset.
- Handle a routine resize close to where the image is shared.
- Reduce repeated trips into image editing tools.
- Keep output dimensions consistent for a known use.
Setup
Build it in a few focused steps.
- 1Connect Slack and Encodian to Notis once in the portal.
- 2Create an automation prompt that identifies the intended images and describes the required size or percentage.
- 3Pick the Slack Channel Message Received trigger and choose where run reports should go.
- 4Test with one sample image and check the resized result.
Questions about this workflow
Can it preserve the image proportions?
Encodian supports optional aspect-ratio enforcement; include the desired behavior in the prompt.
Will every image in Slack be resized?
Use the prompt to describe the relevant image and use case so Notis can avoid unrelated channel images.
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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