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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_compressed_texture_pvrtc below:

WEBGL_compressed_texture_pvrtc extension - Web APIs

The compressed texture formats are exposed by four constants and can be used in two functions: compressedTexImage2D() (where the height and width parameters must be powers of 2) and compressedTexSubImage2D() (where the height and width parameters must equal the current values of the existing texture and the xoffset and yoffset parameters must be 0).

ext.COMPRESSED_RGB_PVRTC_4BPPV1_IMG: RGB compression in 4-bit mode. One block for each 4Ã4 pixels.
ext.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG: RGBA compression in 4-bit mode. One block for each 4Ã4 pixels.
ext.COMPRESSED_RGB_PVRTC_2BPPV1_IMG: RGB compression in 2-bit mode. One block for each 8Ã4 pixels.
ext.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG: RGBA compression in 2-bit mode. One block for each 8Ã4 pixels.

Examples

const ext = gl.getExtension("WEBGL_compressed_texture_pvrtc");

const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);

gl.compressedTexImage2D(
  gl.TEXTURE_2D,
  0,
  ext.COMPRESSED_RGB_PVRTC_4BPPV1_IMG,
  512,
  512,
  0,
  textureData,
);

Specifications Browser compatibility

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