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"The web server cannot generate responsive image sizes for this image" in WordPress.

Error "The web server cannot generate responsive image sizes for this image. Convert it to JPEG or PNG before uploading." (code "rest_upload_image_type_not_supported") appears in WordPress version 6.8 or higher if you have not installed required PHP modules for image processing. You can verify this by going to "Tools" -> "Site Health" in the admin panel:

Where to find Site Health in the WordPress admin panel

If you see a similar message here:

Information indicating that PHP lacks the imagick and gd modules in WordPress

So you need to:

  • Add support for at least the gd module in PHP on your server
  • Or roll back to WordPress versions below 6.8 (not recommended).