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PixelRefiner — Pixel Art and Sprites

HappyOnigiri

PixelRefiner is an open-source browser tool that cleans up pixel art, especially AI-generated images, by detecting the pixel grid, removing anti-aliasing and background, and reducing colors.

Why it fits

Pixel Art and Sprites

Website

Go to pixel-refiner.app

Good to know

Available features may vary by device and access method.

Check the official page for current quotas and output conditions.

Good to know
Good to knowWebsite
Free output—
No account needed—
No watermark—
Works offline—
Batch processingYes
Content language—

— Unverified conditions. Official documentation reviewed. The app itself has not been hands-on tested. Matches only documented content-language support, not interface language.

Sources and review date2
Founder feedback and correction

Founder feedback and correction

If you represent this product, send a source-backed correction or update to the editors. Publication follows editorial review.

Editorial selection guide

Last checked:

Who is it for?

  • Useful if an AI-generated or upscaled pixel art image looks blurry or uneven and you want it converted back to a clean pixel grid.
  • Useful for preparing several sprites or icons at once, since the tool processes multiple images and exports a ZIP.

Getting started

  • Open the site and drag one or more images onto the drop zone.
  • Pick a purpose preset or adjust the grid detection, background removal, palette and dithering settings.
  • Process the images, check the comparison view, then download single files or a ZIP at the scale you need.

Decision points

  • Choose it when you already have a pixel art image and want automatic cleanup rather than a drawing editor; the project says manual pixel-by-pixel editing is not planned.
  • Choose a drawing tool such as Aseprite, Piskel or Pixelorama if you need to draw or animate from scratch.

Limits

  • Results are automatic; check grid detection and colors on each image, and try the Hint or Force modes if the grid is detected wrongly.
  • The listed interface languages are English, Japanese and Simplified Chinese; the site shows the project's MIT license but does not describe a separate free-use policy.

Frequently asked questions

Are my images uploaded to a server?

The site says images are processed within your browser, and the README says processing runs locally with Web Workers. Check the site's privacy information if you work with sensitive files.

Can I edit pixels by hand in it?

No. The README says the tool is for automatic conversion and that manual pixel-by-pixel editing like a paint program is not planned.

Official sources (2)
pixel-refiner.app/github.com/HappyOnigiri/PixelRefiner

Related guides and comparisons

Pixel Art and Sprites: tools and apps