Stable Diffusion
Upsampler's custom Stable Diffusion-powered upscaler. Preserves the overall composition while regenerating fine detail — good for upscaling that should keep the source recognizable while filling in plausible texture and detail. A different aesthetic from the Flux upscaler; pick whichever style fits the source. Only available on Upsampler.
At a glance
- Price
- 1 Credit/MP
- Our rating
- Max resolution
- 50 MP
- Type
- Creative
What Stable Diffusion is best for
How Stable Diffusion performs
Strengths
- Upsampler's custom SD1.5 upscaler integration not available elsewhere
- strong creative interpretation
- broad style range
Limitations
- lower fidelity than Flux upscale
- creative bias may diverge from source
How to prompt Stable Diffusion
Practical tips to get the most out of Stable Diffusion.
- 01use prompts to steer the enhancement
- 02low creativity for preservation, high for stylized lift
- 03test settings before bulk runs
Tips are tuned for Stable Diffusion specifically.
Made with Stable Diffusion
Alternatives to Stable Diffusion
Other models on Upsampler that cover similar ground.
Flux (upscale)
Upsampler's in-house creative upscaler powered by Flux. Adds plausible new detail at higher resolution rather than just enlarging existing pixels — the adjustable creativity slider lets you dial between faithful upscaling and aggressive detail enhancement. Built for AI-generated images, stylized work, and any upscale where the source benefits from a quality lift, not just a resolution lift. Only available on Upsampler.
GAN
Traditional GAN-based upscaling — fast, low-cost, and faithful to the source. Doesn't add invented detail like diffusion-based upscalers; preserves what's there at higher resolution. The pragmatic choice for high-volume batch upscaling where speed and credit cost matter more than aesthetic lift.
Seed VR 2 Large
The larger variant of ByteDance's SeedVR2 with higher fidelity for archival-grade outputs. Same source-preserving philosophy as the standard model — no creative reinterpretation, no invented detail — just better recovery of fine texture and edge sharpness for hero archival pieces.
Frequently asked questions
What is Stable Diffusion?
Upsampler's custom Stable Diffusion-powered upscaler. Preserves the overall composition while regenerating fine detail — good for upscaling that should keep the source recognizable while filling in plausible texture and detail. A different aesthetic from the Flux upscaler; pick whichever style fits the source. Only available on Upsampler.
How much does Stable Diffusion cost on Upsampler?
1 credits per megapixel. No subscription, credits never expire.
What is the maximum output resolution?
Up to 50.0 megapixels per generation.
What are alternatives to Stable Diffusion?
Common alternatives: Flux (upscale), GAN, Seed VR 2 Large.
Can I try Stable Diffusion for free?
You can try a free, no-signup version of our ai image upscaler. Note that the free version may use a different, lighter model rather than Stable Diffusion itself.