Convert a normal map between OpenGL (+Y) and DirectX (−Y) by mirroring the green channel.
Drop image files hereProcess many files at onceNo 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.