Fake Error Message Generator

Create custom error dialogs for Windows XP, 7, 10, 11, macOS Big Sur, macOS Classic, Linux GNOME and KDE. Edit title, message, icon and buttons - then download as a PNG. Free, no signup, no watermark.

Error Dialog Settings

Operating System Style

Windows XP

Windows 7

Windows 10

Windows 11

macOS Big Sur

macOS Classic

Linux GNOME

Linux KDE

Icon

Error

Warning

Info

Question

Buttons

OK / Cancel

Yes / No

Yes / No / Cancel

Abort / Retry / Ignore

Retry / Cancel

Text Content

Window Title

Error Code (optional)

Error Message

Tips for Best Results

Match the OS style to your screenshot for realism
Add an error code like 0x80070643 for authenticity
Keep messages short - 2-3 sentences works best
Use Show Fullscreen for live in-person pranks
Click Download PNG for use in videos and posts
Click Share Link to send your dialog to a friend

8 Authentic Styles

Windows XP, 7, 10, 11, macOS Big Sur, macOS Classic, Linux GNOME, KDE

Free PNG Download

No watermark, no signup, no usage limits - the image is yours

Runs Locally

All rendering happens in your browser - nothing is uploaded

This is a free, browser-based error dialog image generator that creates pixel-accurate fake system error messages for any operating system. Pick a style, set the icon and buttons, write your title and message text, then download the result as a clean PNG with no watermark.

Eight OS styles are included: Windows XP, Windows 7, Windows 10, Windows 11, macOS Big Sur, macOS Classic, and Linux GNOME and KDE. Each style uses authentic typography, gradients, button shapes, and window chrome to match what users actually see on those systems.

You can also use Show Fullscreen mode to display the error live on a friend's computer for in-person pranks - the dialog appears in the center of a darkened screen and exits with the Esc key.

1. Pick an operating system style - Match it to whatever computer or screenshot you'll be pairing the error with.

2. Choose an icon - Error (red X) is the most common, but Warning, Info, and Question all have valid uses.

3. Pick which buttons to show - OK alone, OK/Cancel, Yes/No, Abort/Retry/Ignore, or Retry/Cancel.

4. Write the title and message - Keep the title short (under 50 characters), and the message to 1-3 sentences for best results.

5. Add an error code (optional) - Realistic codes like 0x80070643 or 0xC0000005 add authenticity.

6. Download as PNG or show fullscreen - Save the image to your computer or display it live on screen.

YouTube Thumbnails

Eye-catching error thumbnails dramatically boost CTR on tech content.

Blog Posts & Articles

Illustrate tech support guides with realistic dialog screenshots.

Presentations

Use in slides about UX design, error handling, or system reliability.

Memes & Social

Create custom error dialog memes for Reddit, Twitter, Discord.

Video Productions

Quick screen overlays for short films and tech-themed sketches.

UX Design Courses

Teach error dialog conventions across operating systems.

Yes. The tool only generates an image of an error dialog inside your browser. Nothing is installed and no system errors actually happen. You can save the result as a PNG.

Use them in YouTube thumbnails, blog posts, presentations, memes, fake screenshots, video edits, or any prank where you want to display a believable error dialog.

Yes. Both the dialog title bar text and the body message are fully customizable. Most operating system styles also let you choose icon (error, warning, info, question) and which buttons to show.

Yes. Eight styles are supported - Windows XP, 7, 10, 11, macOS Big Sur, macOS Classic, Linux GNOME, and Linux KDE - each with authentic visual styling.

Click the Download PNG button below the live preview. The image saves directly to your downloads folder with no signup or watermark.

No. The downloaded PNG is clean - no watermark, no logo, no signup required. The image is yours to use.

Yes. Click the Share Link button to copy a URL containing all your current dialog settings. Anyone who opens the link sees the same configuration ready to download or modify.

Yes. The tool runs on iOS Safari, Android Chrome, and any modern mobile browser. The preview and download work identically on mobile.

Pair this with our Fake Windows Update or Fake Virus Scanner for full-screen pranks beyond static images.

For the hacker-typing aesthetic, try the Fake Hacker Terminal.

Edit your error screenshots into videos with CapCut or VSDC Free Video Editor.