Render pixelation is common in Blender. It may be caused by low sampling rates or resolution, as well as incorrect settings for how your render should display. Luckily there are several methods to deal with this problem and at the same time also improve your image quality
Steps for Changing Pixelated Images
Increase the Sample Rate: One of the key reasons for image pixelation is low sample rates. In the Render Properties tab, up the number of samples for both Eevee and Cycles. For Cycles, samples of 500-1000 will give good images that are sufficiently smooth
Denoise the Render: Blender contains a built-in Denoiser for cutting back the noise in your renders. You can enable Denoising in the Render Properties tab, which will allow images to be cleaned up automatically.
Increase the Resolution: Ensure that your render resolution is set high enough to prevent pixelation. In Output Properties, increase resolution to 1920×1080 or above for more detailed images
Adjust Light Paths: In Cycles, light path settings can affect render quality. Reducing the Max Bounces will help to speed up rendering times, but if too small then it might result in pixelation of indirect lighting regions. Try upping Diffuse and Glossy Bounces for better results
Check Texture Resolution: Low-resolution textures can cause pixelation in the final render. Be sure that your textures are high resolution and properly UV-mapped onto your models
By following these steps, the overall quality of your renders in Blender can be greatly improved and pixelation avoided. You can ensure smoother more defined images.
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