Online Tool Store
Text on Image Tester
Preview text overlaid on an image with adjustable color, size, and shadow, plus a contrast/readability warning. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
This warning is a rough brightness check, not a WCAG contrast measurement. Read our guide to checking text readability on an image for practical examples and a checklist for the final export.
How it works
- Upload a background image, or use the sample gradient.
- Type your text and adjust color, size, and shadow.
- Watch for a low-contrast warning, then download the result.
FAQ
How does the contrast warning work?
It samples the average brightness of the background pixels directly behind your text and compares it to the text color's brightness — a small difference means the text likely blends into the background and may be hard to read.
What should I do if I get a low-contrast warning?
Try a different text color, enable the drop shadow to add an edge that separates text from background, move the text to a less busy part of the image, or add a semi-transparent overlay behind the text in your final design.
What is this useful for?
Checking a hero banner headline, a social media graphic caption, or any text overlay before publishing — catching readability problems before they go live rather than after.
Is my image uploaded anywhere?
No — the preview and contrast check happen entirely in your browser using the Canvas API. Nothing is sent to a server.
How we compare
| Feature | Online Tool Store | Desktop image editors | Social media caption tools |
|---|---|---|---|
| Built-in readability warning | ✓ | Manual eyeballing | Rarely included |
| No install | ✓ | Requires an application | ✓ |
For a quick readability check before publishing a graphic, this catches contrast problems a busy background can make easy to overlook.