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This is a paid asset, but now you can download Resize Pro Free.
Resize Pro v2019.3
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Resize Pro v1.41
Using GPU acceleration Resize Pro is the fastest texture resize tool for Unity in the world.
Has no limits on texture formats and works even with textures that aren’t Read/Write enabled.
In Editor textures can be converted directly from Project window or by using batch converter.
Run-time API adds ResizePro() extension method to the Texture2D class.
Have questions? Forum.
Note:
• Tool is already included in Texture Adjustments asset.
• Scripts are packed in dll.
• (Only in editor) Even ResizePro supports all texture formats, generated texture can be saved only in .jpg, .png and .tga formats.
• (Only in run-time) If memory allocated by source texture is locked, then ResizePro can not directly modify it and creates new resized texture.