Pixel Perfect Checker

Measure the pixel size, grid offset, blurred edges and colour count of an upscaled sprite.

Drop image files hereProcess many files at once

No upload · processed on this device

Pixel Perfect Checker

Measure the pixel size, grid offset, blurred edges and colour count of an upscaled sprite.

How it works

Add images
Adjust settings and review the result
Download a new file

Supported formats

PNG / JPG / WebP / AVIF / HEIC → PNG + JSON (ZIP) — Input decoding depends on browser support and optional engines.

What this tool does

Measure an upscaled sprite’s real pixel size, grid offset, blurred edges and colour count.

Implementation and verified quality

advanced · colour-change residues for integer block grids / run lengths / Oklab edge interpolation count. Quality qualification is in progress. Pro/Flagship quality has not been established.

Before you export

Only an integer block grid is proven exactly; a non-integer factor is reported as a run-length estimate, not a fact.

Frequently asked questions

What are this tool’s limitations?

Only an integer block grid is proven exactly; a non-integer factor is reported as a run-length estimate, not a fact.

Are my files uploaded?

Nerulio processes selected files on your device and has no file-upload API. Optional engines and models are downloaded from third parties; those requests expose connection information such as your IP address.

Will my work be saved automatically?

No. Images and editing state stay in this tab; media output can use local temporary storage. Changing language preserves your work; reloading, closing the tab, or following a link to another page can clear it.