About this fake slack message generator
Mockly's fake Slack message generator lays out a channel conversation with avatars, bold names, timestamps and emoji reactions under each message. Name the channel, add a few teammates and write the exchange, whether it's a cake emergency in #random or a debate about the office plant.
It's handy for team retros, onboarding slides, newsletters and comedy videos about remote work. Keep the content fictional and kind. Nothing is sent to Slack or any server, and every exported image includes a small Prank watermark. Drafts autosave, so you can tweak the punchline before the meeting starts.
How to make a fake Slack Message (for fun)
- Pick a prank idea. Start from one of 4 ready-made ideas, or keep the default slack message.
- Edit the details. Change names, avatar, messages, times, counts and theme in the Content panel — the preview updates as you type.
- Check the preview. On a phone, switch to the Preview tab; the mockup scales to fit your screen.
- Download or share. Save a PNG or JPG at 2x or 3x, copy it, or share it straight from your phone. Then reveal the joke!
Slack Message prank ideas
One click loads each idea into the editor above — then make it yours.
What you can customise
- Channel header and message list with avatars
- Multiple authors and timestamps
- Emoji reaction pills under messages
- Channel name and topic in the header
- Light and dark themes
- One-click presets, autosave and PNG/JPG export
- One-click prank presets to start from
- Autosaves in this browser — nothing is uploaded
- Download PNG or JPG at 2x or 3x resolution
- Copy the image or share it straight from your phone
Good ways to use it
- A funny slide for a team retro or all-hands
- Mocking up a Slack bot idea for a demo
- A remote-work comedy skit or video
- Security-awareness training about faked screenshots
Keep it a joke. Mockly makes parody images for fun. Never use a mockup to deceive, defame, harass or defraud anyone, and don't pose as a real person's or brand's official account. Every export carries a small “Prank · altftool.com” watermark. Not affiliated with Slack or any app shown.
FAQ
Can I add emoji reactions?
Yes, you can add reactions with counts under a message to make the channel feel lively.
Does this connect to my Slack workspace?
No. There's no integration; the mockup is drawn entirely in your browser.
Is a fake Slack screenshot legal?
For jokes and demos, yes. Using one to impersonate colleagues, fake instructions or mislead people can break workplace policies and the law.
Is there a watermark?
Yes, a small 'Prank · altftool.com' watermark appears on every export.
Is the Slack Message generator free?
Yes. It is free with no sign-up and no limit, and it runs entirely in your browser — your text and images never leave your device.
Will people know it's fake?
They should. Every image carries a small “Prank · altftool.com” watermark, and a good prank is revealed quickly. Mockly is for parody and fun, never for deceiving anyone.
Is it legal to make a fake Slack screenshot?
Making a parody image for a joke is generally fine. Using one to deceive, defame, harass, impersonate or defraud someone can be illegal and breaks every platform's rules — so don't.