Ka Naazhigai Tamil Font Verified Free Extra Quality Download -

This is often a ClearType issue on Windows. Go to Control Panel > Appearance > Adjust ClearType text. Turn ClearType ON and select the smoothing level that makes Ka Naazhigai sharp.

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Since this is a Unicode font, you do not need special software. You just need a Tamil keyboard enabled on your PC. This is often a ClearType issue on Windows