How do I reduce noise in Cycles renders?

Updated October 2026 · How we answer

Sampling and Denoising

The most direct way to reduce noise is to increase the number of samples in Render Properties > Sampling. Start with 128–512 for stills, and use the OptiX or OpenImageDenoise denoiser to clean up remaining noise. Denoising can let you use lower samples, saving time.

For animations, enable the denoiser but be aware it may cause flickering; consider using a temporal denoiser or rendering with higher samples instead.

• Set Render Samples to 128–512 for stills.
• Enable Denoising in Render Properties.
• Use OptiX denoiser for NVIDIA GPUs.
• For animations, test denoising for flicker.

Light Paths and Clamping

Noise often comes from indirect light bounces. In Light Paths, reduce Max Bounces (e.g., 4–8 for diffuse, 2–4 for glossy) to limit complex light transport. Clamp Indirect and Direct values (e.g., 10–20) to reduce fireflies.

Use Multiple Importance Sampling (MIS) for area lights and HDRIs to improve convergence. Also, ensure your light sources are large enough to avoid harsh shadows and noise.

• Reduce Max Bounces: Diffuse 4, Glossy 4, Transmission 8.
• Clamp Indirect to 10–20 to kill fireflies.
• Enable Multiple Importance Sampling on lights.
• Use larger light sources for softer shadows.

Scene and Render Settings

Check that your materials are not overly glossy or rough in a way that causes noise. Use the Filter Glossy setting (e.g., 0.5–1.0) to blur glossy reflections and reduce noise. Also, ensure your render resolution is not too high; lower resolution and upscale if needed.

If noise persists, try switching to Branched Path Tracing for complex scenes, but note it can be slower. For final renders, consider using a render farm or cloud service to handle high sample counts.

• Set Filter Glossy to 0.5–1.0.
• Lower resolution and upscale in post.
• Try Branched Path Tracing for tricky scenes.
• Use render farms for high-sample final renders.