Any reliable websites that add furigana to text?

I happened to accidentally get a manga that has no furigana because I missed that it's a josei not a shoujo. My plan was to translate the words one by one and add them as flashcards. But it just takes too long so I eventually stopped. Now I'm looking for a reliable website that adds furigana to text.

The reason I'm asking is because the ones I found said the reading of 二人 is ににん but usually it's ふたり. So if it gets a common word wrong I'm worried it'll tell me more nonsense I won't notice.

Edit: I have the printed version otherwise I would have gone with an extension.

by Lea_ocean1407

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