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Error Dialog Box Generator

Create a picture of an error, warning or information dialog for slides, tutorials, comics, UX mock-ups or video overlays. Type the title, message and button captions, pick an icon, a generic Windows-style or macOS-style look and a light or dark theme, then download a crisp PNG that always carries the simulation label.

OS Screen Simulations Runs in your browser

Generate an Error Dialog Image

The preview and every exported PNG carry the label “SIMULATION — NOT A REAL SYSTEM ERROR.”. Text that looks like a scam (phone numbers, links, virus or payment warnings) is refused.

Up to three, separated by commas.

Every exported image includes the band “SIMULATION — NOT A REAL SYSTEM ERROR.”. Visual simulation for demos, training, video and stage props. It cannot change, lock or harm your device, never asks for anything, and this site is not affiliated with, endorsed by or connected to Microsoft or Apple.

How to Use the Error Dialog Generator

  1. Choose the Style, Theme and Icon.
  2. Type the Title, Message and up to three Buttons separated by commas.
  3. Check the live preview, choose an Image scale and press Download PNG.

About This Tool

Technical writers illustrating error handling, UX designers mocking up alerts, teachers, meme makers and video editors who need a dialog graphic.

Input: Title, message, icon, buttons  ·  Output: PNG image with simulation label.

Features and Limitations

Features

  • Three generic looks, light and dark themes and five icon choices drawn as simple shapes.
  • Live preview with automatic text wrapping and dialog sizing.
  • PNG export at 1×, 2× or 3× with the simulation label band built into the image.
  • Content filter that refuses phone numbers, links and scam-style wording.

Limitations

  • Dialogs are drawn generically and do not copy real system fonts or pixel layouts; text uses your device's system font.
  • The simulation label band is part of every image and cannot be turned off.
  • Messages are limited to 300 characters and buttons to three.
  • Results are computed in your browser; nothing you enter is sent to a server.

Example

Title “Photo Editor”, message “Not enough memory to apply this filter. Close other images and try again.”, buttons “OK” produces a 2× PNG about 900 pixels wide.

Frequently Asked Questions

Why does the image have a yellow label?

So the picture can never be passed off as a real system warning. Fake error pop-ups are a common scam technique, and the label prevents that misuse.

Which characters can I use?

Any normal text, including accents and emoji, but not phone numbers, web or email addresses, or words about viruses, payments, passwords or support lines.

Can I get a transparent background?

Yes. The area around the dialog is transparent in the PNG, so you can place it over any screenshot.

Is it affiliated with Microsoft or Apple?

No. The “-style” looks are independent generic designs, not affiliated with or endorsed by either company.

Related Tools

More like this: all OS Screen Simulations tools, all Screen & Display tools or the TinySandy home page.