Resize Image to 512 × 512 Pixels

How to resize to 512×512

1. Select an image — PNG keeps transparency, which icons usually need.
2. Press Resize; the 512 × 512 target is already set.
3. Download.

Why 512 and not 500

512 is 2⁹. Powers of two matter in three places:

• GPU textures. Graphics hardware handles power-of-two textures most efficiently, and mipmap chains halve cleanly: 512 → 256 → 128 → 64 → 32 → 16.
• Icon sets. A single 512 px master downsizes exactly to every smaller icon slot with no fractional pixels.
• Model inputs. Many vision and diffusion models are trained at 512×512 and expect precisely that.

Keep the transparency

Icons almost always need a transparent background. Leave the output as PNG (or WebP) — if you pick JPG you will be asked which solid colour should replace the transparent pixels, because JPEG has no alpha channel at all.

Resampling quality

Downscaling is where cheap tools give themselves away. Throwing an 8000 px image into a single drawImage call at 800 px makes the browser sample roughly one pixel in a hundred, which produces aliasing on fine detail — moiré on fabric, jagged edges on text, sparkle on foliage.

This tool steps the image down in halves and finishes with a high-quality Lanczos pass, so every source pixel contributes to the result. Aspect ratio, transparency and EXIF orientation are preserved throughout.