Normal Map Converter (OpenGL ↔ DirectX)

Convert a normal map between OpenGL (+Y) and DirectX (−Y) by mirroring the green channel.

Drop image files hereProcess many files at once

No upload · processed on this device

Normal Map Converter (OpenGL ↔ DirectX)

Convert a normal map between OpenGL (+Y) and DirectX (−Y) by mirroring the green channel.

How it works

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

Supported formats

PNG / JPG / WebP / AVIF / HEIC → PNG — Input decoding depends on browser support and optional engines.

What this tool does

Convert a normal map between OpenGL (+Y) and DirectX (−Y) by mirroring the green channel.

Implementation and verified quality

advanced · green-channel mirror (byte reversible). Quality qualification is in progress. Pro/Flagship quality has not been established.

Before you export

A file cannot be measured to tell which convention it uses; the engine expectations are listed with their sources.

Frequently asked questions

What are this tool’s limitations?

A file cannot be measured to tell which convention it uses; the engine expectations are listed with their sources.

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.