By adding a font, enjoy the subtitles in your desired font.
First, copy a font file to nPlayer Documents.
You can copy the font via iTunes, Wi-Fi Transfer or network sharing.

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Copy a font to Documents.

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Tap Settings at the bottom and select Subtitle.

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Select Font from SRT/SMI/SUB/MLP2/LRC/TXT.

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Select the copied font.

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Play a subtitle with the newly selected font .