Stable by seed
Use a human-readable seed for assets that should remain identical across builds and devices.
URL builder
Classic placeholder generator
Control size, colour, text, transparency, typography, borders, corners, quality and DPR.
No accountNo API keyStable seeds
Rendering…Smallest suitable format
Auto keeps compact vectors as SVG and chooses AVIF with a WebP fallback for photographic output. JPEG is avoided when transparency is active.
Safe limits
Dimensions, text, effects and total pixels are validated before expensive work begins.