I will post an ad about an item for sale. I mention everything about the item
in English, but at the end of the ad I want to say, "It's ok to reply in
Japanese."

Is it proper grammar to say "返信は日本語でも大丈夫です!" if an ad is posted online and you
are referring to people responding to the ad?
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grammar
I want to mention that replying in Japanese is ok
**ご返信** は日本語でも大丈夫です！ sounds much better. However, 返信 means an answer to spoken
or written communication. It is not used to "answer an ad" (that would be
応募する). お問合せ (enquiry, question) is a better call here: お問い合わせは日本語でも大丈夫です!
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How proper do you want it to be?

I think it would be understood, but it is a little odd. It feels like you're
saying it's okay to send the reply using Japanese.

Referring to the [question on 返信 vs.
返事](https://japanese.stackexchange.com/questions/17359/word-difference-
question-reply-%E8%BF%94%E4%BA%8B-vs-%E8%BF%94%E4%BF%A1)、 返信 is about a
communication activity, not about the information itself.

I think I'd use a bit of honorific and stick with 返事〜

> 日本語でもご返事していただけます。

But even that depends on context.

(yabut)

See this:

<https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1210045367>

「返事していただけます。」 would probably more than polite enough, but, after talking with
my daughter, I am convinced that 「返事」 is even more out of place than 「返信」。 If
I understand this correctly, 「返事」 would be appropriate when you pretty much
expect an answer from the reader, as in, say, an on-line-quiz.

(end yabut)

(additional information)

Given that this is a classified ad, if you are worried that an all-English ad
will scare away some potential buyers, Ben's suggestion about 「お問い合わせ」 is
quite workable. Also, you could simply leave out the implicit verb for
contacting and say, 「日本語で大丈夫」 or 「日本語でも、どうぞ。」。

It may feel a little abrupt, but the Japanese people who are reading your ad
in English will, on the contrary, feel it a little odd if the last sentence
only is in perfect Japanese.

(end additional information)
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Yes, it is absolutely proper. (if original word "reply" is appropriate for
your ads)

For ads, there is a commercial expression.

> 日本語対応可能です。

But I like your original sentence :)
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