The short answer
Why use Random Image?
When the size has to be exact, drawing a new image beats stretching an old one. Change a value and make it again whenever you need.
Every pixel gets random red, green, and blue values from the browser's cryptographic random number generator, and the image is fully opaque. Width and height can be anything from 16 to 8000 pixels, 1200 × 800 by default, and each run is different.
Random noise has no pattern for a compressor to exploit, so the PNG stays close to the size of the raw pixel data. That makes it a handy test file: you can check how an upload form treats a big image without hunting for one, or convert it to JPEG to see a worst-case file size at a given quality.
Random Pixel runs the same generator and produces the same kind of noise. This page is aimed at test files and placeholders; Random Pixel covers using the noise as a texture.
Where Random Image fits
Upload limit tests
Check how a site handles a large image that will not compress.
Codec comparisons
Compare how JPEG, WebP, and AVIF cope with worst-case content.
Layout placeholders
Fill an image slot at the exact size while the real photo is on its way.
Start to finish
How to use Random Image
- 01Tap Open Random Image. A noise picture is made for you, with no file to choose.
- 02Type Width (px) and Height (px), anywhere from 16 to 8000. The default is 1200 × 800.
- 03Tap Apply changes for a fresh pattern, then tap Download result to save the PNG.
What to expect from Random Image
| Check | What it means here |
|---|---|
| Supported input | No upload required |
| Main controls | Width and height, plus the labels, colors, data, or layout the tool needs |
| Output | PNG, SVG, HTML code, or a ZIP, depending on the tool |
| Working limit | Up to 8,000 pixels per side |
Random Image tips
- Noise barely compresses, so even 1200 × 800 makes a PNG of a few megabytes.
- Set 8000 × 6000 to see how a form copes with a 48-megapixel upload, close to the 50-megapixel cap.
- Convert the PNG to JPEG to find a worst-case file size at your chosen quality.
- Every pixel is fully opaque, so this file will not test transparency handling.
Random Image FAQ
Something missing? Ask us.
Does Random Image show random photos?
Does Random Image upload my file?
Is Random Image free to use?
Why did Random Image fail or look wrong?
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