Slack Channel Post Generator
Generate authentic Slack channel post screenshots with threads, reactions, and file attachments
Channel settings
Messages
- Message 1AvatarShared by every message with this display name. Any image up to 5 MB.Reactions
- 👍 4
- 🚀 2
- Message 2AvatarShared by every message with this display name. Any image up to 5 MB.Reactions
- 🎉 3
No messages yet. Add one below.
Reaction to add
Add message
Tips
- Pick a reaction and a count under “Reaction to add”, then use Add reaction on any message. Adding a reaction the message already has raises its count.
- A message added with thread replies shows its author’s initial in the reply stack.
- An avatar picture is shared by every message with the same display name.
- Leave the time empty when adding a message to stamp it with the current time.
Preview
The preview updates as you edit.
About the Slack Channel Mockup Generator
Our free Slack channel mockup generator builds realistic Slack workspace channel screenshots, message by message. For a 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 their own 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 , and the whole mockup redraws in the new theme.
Your messages and pictures are never uploaded or stored by this 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, as in the Slack mobile app.
- 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 drawn as its own icon, the same on every device.
- 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.
- In-place message editing: Change any message’s display name, text, time, reactions, thread reply count or code attachment directly in the list without removing and re-adding.
- PNG export: Download at 390px width with dynamic height. No watermarks, no branding: ready for presentations, blog posts, and social media.
- Private: Your messages and pictures are never uploaded or stored.
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 set thread reply counts and enable code attachments, then add reactions to any message with the reaction picker.
- Edit messages in place: Change any existing message’s content, reactions, or thread count in the list without starting over.
- Preview in real time: The 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 watermark-free PNG 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
How do I add reactions to messages?
Pick a reaction (thumbs up, eyes, rocket, fire, check or party) and a count under “Reaction to add”, then use Add reaction on any message. Adding a reaction the message already has raises its count.
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.
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. Every message stays editable in the list: change the display name, message text, timestamp, reactions, thread reply count or code attachment, and the preview follows at once.
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 thumbs up with a count of 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.