Built for Speed
Hybrid caching (Redis + filesystem) keeps responses instant and consistent.
Our Mission
FillThat exists to give designers and developers frictionless placeholder images—WebP optimized, cache-aware, and ready for production-like mockups. No registrations, no API keys, just clean URLs that work.
Resilient by Design
Graceful fallbacks if Redis or database connectivity drops—generation keeps working.
Flexible Output
Control dimensions, text, colors, gradients, and optional AI generation.
Secure Defaults
Sanitized inputs, prepared statements, and rate limiting protect the service.
How It Works
- Clean URLs route through Apache rewrites into the PHP generator.
- Requests validate sizes, colors, and optional text or gradient parameters.
- Cache lookup happens first (Redis primary, filesystem fallback).
- GD renders WebP output; optional AI providers can be enabled.
- Response ships with cache headers and credits/watermark if configured.
Reliability & Performance
- Image format: WebP for ~30% smaller payloads.
- Limits: Sizes clamped between 50×50 and 4000×4000; text max 200 characters.
- Availability: No dependency on database for base generation; falls back to config defaults.
- Delivery: Cache headers, GZIP compression, and object-fit rules to keep layouts stable.
Get Started
Jump back to the live generator or explore the full parameter list in the documentation.
Try the Generator
Use the live generator to preview URLs instantly.
Read the Docs
Documentation covers URL patterns, gradients, fonts, and AI options.