Toolsvana→Social Media Tools→Slack Channel Post Generator

Slack Channel Post Generator

Generate authentic Slack channel post screenshots with threads, reactions, and file attachments

Channel Settings

Channel Name

Date Separator

Members

Pinned

Dark Mode

Messages

Toolsvana9:41 AM

Welcome to Toolsvana! Your all-in-one online toolbox 🚀

thumbsup:4rocket:2

ToolBot9:45 AM

Try our free tools at toolsvana.com; no sign-up required!

tada:3

Add Message

Code attachment

Tips:

Reactions format: thumbsup:3, fire:2, rocket:1, eyes:4, ok:2, tada:5
Click the pencil icon to edit any message inline
Enable code attachment to add a file snippet below a message
Toggle dark mode for the Slack dark theme look

Preview

About the Slack Channel Mockup Generator

Our free Slack channel mockup generator lets you create pixel-perfect, realistic Slack workspace channel screenshots in seconds, directly in your browser with zero downloads or sign-ups. Whether you need a convincing Slack channel screenshot for a product demo, a training deck, or a design prototype, this tool faithfully reproduces the authentic Slack channel interface; the signature purple sidebar, the # channel-name header with member counts, pinned items, and search, message avatars with display names and timestamps, and the complete message input bar with formatting toolbar.

Every detail is faithfully rendered: square rounded avatars with auto-generated colors for each unique display name, message reaction pills with canvas-drawn icons and counts, thread reply indicators with stacked mini-avatars, code block attachments styled exactly like Slack's file previews, and a complete formatting toolbar (bold, italic, strikethrough, links, lists, code) below the message input field. Switch between Slack light mode and dark mode with one click, and the entire canvas updates instantly.

Built entirely on client-side HTML5 Canvas rendering, your data never leaves your device; making this the most privacy-friendly Slack screenshot maker available online. Add multiple users, customize every message with reactions and thread replies, include code attachments, and download a watermark-free PNG in one tap.

Key Features

Authentic Slack channel UI: Signature purple sidebar with workspace icon, channel header with hash symbol, member count, pin count, and search icon, exactly matching the official Slack desktop application.
Multi-user conversations: Add messages from different users with unique display names. Each user gets an auto-generated colored square avatar with rounded corners, just like real Slack.
Message reactions: Add emoji reaction pills (thumbs up, fire, rocket, eyes, checkmark, party) with custom counts. Each reaction is canvas-drawn with no actual emoji characters.
Thread reply indicators: Show thread reply counts with stacked mini-avatars, "N replies" links, and "View thread" text, replicating Slack's threaded conversation UI.
Code block attachments: Attach code snippets to any message with a styled file-name header bar and monospace code block, perfect for developer-focused mockups.
Light and dark mode: Toggle between Slack's official light and dark themes. Colors, borders, backgrounds, and text all update to match the authentic palette.
Complete formatting toolbar: The message input area includes bold, italic, strikethrough, link, ordered list, unordered list, and code formatting icons, plus the @ mention and emoji buttons.
Date separator badge: Customizable date separator with bordered pill badge centered on a divider line, just like Slack's day markers.
Inline message editing: Click the edit icon on any message to modify username, text, time, reactions, and thread reply count without removing and re-adding.
High-resolution PNG export: Download at 390px width with dynamic height. No watermarks, no branding: ready for presentations, blog posts, and social media.
100% client-side and private: All rendering happens in your browser via HTML5 Canvas. No data is uploaded to any server.

How to Create Slack Channel Screenshots

Set the channel details: Enter the channel name, member count, pinned item count, and date separator text to customize the channel header and context.
Choose your theme: Toggle the Dark Mode checkbox to switch between Slack's light and dark color schemes. Both are faithfully reproduced.
Add messages: Type a display name, timestamp, and message text. Optionally add reactions (format: thumbsup:3, fire:2), set thread reply counts, and enable code attachments.
Edit messages inline: Click the pencil icon on any existing message to modify its content, reactions, or thread count without starting over.
Preview in real time: The canvas preview updates instantly as you make changes, so you always see the final result before downloading.
Download your image: Click "Download PNG" to save a high-resolution, watermark-free image file to your device.

Use Cases

Product demos and marketing: Create realistic Slack screenshots for product landing pages, feature announcements, and promotional materials without exposing real workspace data.
UI/UX design portfolios: Generate authentic Slack interface mockups for case studies, wireframes, and design system documentation.
Training and onboarding: Build sample channel conversations for employee onboarding decks, Slack etiquette guides, and remote-work best-practice materials.
Blog content and tutorials: Illustrate articles about team communication, project management, and developer workflows with realistic Slack screenshots.
Presentations and pitch decks: Embed polished Slack channel views into slide decks to demonstrate team collaboration, integration workflows, or product features.
Social media content: Create shareable Slack mockups for Twitter, LinkedIn, and Instagram posts about workplace culture, productivity tips, and team wins.
App development prototypes: Use Slack channel screenshots as reference mockups when building messaging features in your own applications.
Customer success stories: Illustrate how teams use your product in Slack with realistic channel conversation mockups.

Frequently Asked Questions

Is this Slack channel generator free to use?

Yes, 100%. Our Slack channel mockup tool is completely free with no hidden fees, no sign-up, and no usage limits. Generate as many Slack screenshots as you need.

How do I add reactions to messages?

Use the format "label:count" separated by commas, e.g. "thumbsup:3, fire:2, rocket:1". Available reaction types: thumbsup, eyes, rocket, fire, ok, and tada.

Can I add code block attachments?

Yes! Check the "Code attachment" box when adding a message, then enter a file name and code snippet. The attachment renders with a styled header bar and monospace code block, matching Slack's file preview design.

Does it support Slack dark mode?

Yes. Toggle the "Dark Mode" checkbox to switch between Slack's official light and dark themes. The purple sidebar, channel background, message text, reactions, and input area all update to match the authentic dark palette.

What is the difference between this and the Slack DM mockup?

This tool generates a Slack channel view with the workspace sidebar, # channel header, multiple users with distinct avatars, thread replies, and reaction pills. The DM mockup creates a one-on-one direct message conversation layout.

Is my data private?

Completely. All processing happens locally in your browser using HTML5 Canvas. No messages, images, or personal information are sent to any server. Your mockup data stays on your device.

What image resolution does the download produce?

Images are exported at 390px width with dynamic height that scales to your conversation length. Short channels and long threads both render crisply without any cropping or quality loss.

Can I edit messages after adding them?

Yes. Click the pencil icon next to any message to open inline editing. You can change the username, message text, timestamp, reactions, and thread reply count, then click Save to apply changes.

Tips for Realistic Slack Channel Mockups

Use real-sounding display names: Full names like "Sarah Chen" or "Alex Rivera" look much more convincing than generic usernames in a professional channel setting.
Vary message lengths: Mix short one-liners with longer messages to create a natural conversation flow that mimics real Slack channels.
Add reactions strategically: Popular messages in real Slack channels often have 2-3 different reactions. Don't overdo it; a single "thumbsup:4" is more realistic than five different reactions.
Include thread replies: Active channels often have threaded discussions. Adding 3-5 replies on key messages makes the mockup feel like a living workspace.
Space timestamps naturally: Real conversations have varied time gaps. Set timestamps a few minutes apart for rapid discussion, or hours apart for a full-day channel view.
Use descriptive channel names: Names like "product-launch", "eng-frontend", or "team-standup" immediately communicate the channel's purpose and add context to the mockup.