I'm new to SEO and I'm implementing SEO-friendly URLs in my site.The code works perfectly, however I would like to know if using Japanese characters (Kanji / Hiragana / Katakana) in the URL affects my page rank negatively?I'm making this question as most SEO-friendly URLs (say, StackExchange's) remove all non-alphanumeric characters from the question title and replaces spaces by dashes/hyphens/minus signs (-) before putting it into the URL, which is basically the approach I'm using at the moment.However, many thread in a forum that I manage utilize Japanese characters in their titles (e.g. anime/manga titles), which would surely serve as good search keywords.So, are there any drawbacks in utilizing (properly url-encoded) Japanese characters in the URL or is it ok to use these?update: Couple more details/background:About 90% of our content comes from/is relative to Japan;We are a medium-sized forum where users are allowed to share and discuss content;We are a worldwide community, but due to the points above, users are expected to have a minimum of Japanese culture;The titles which I'm referring to are (99% of the time) not random Japanese words, but rather names that generate many hits on Google from all parts of the globe.With the points above in mind, there is no harm in adding these Japanese characters in the URL, or is there?Even though, less than 5% of the threads contain Japanese characters in the title. Therefore it shouldn't be much of an impact on SEO, but I believe it'd look a little weird to have semantic SEO-friendly URLs in English-titled threads and empty names on Japanese-titled threads. This would be considered bad pattern design, am I right?
Is it bad to use Japanese characters in search-friendly URLs?
seo;url rewriting
Compare these URLs:http://example.com//http://example.com/1234/Which is going to bring in more relevant search traffic? It's possible that more people are searching for 1234 on Google than for the title of a Japanese Star Wars manga, but how likely are the 1234 searchers going to be interested in a thread about Japanese Star Wars mangas?Yes, URL is just one factor search engines use for ranking, but it's still a factor and one of the few major ones that you can easily control. And it's always better to have a descriptive URL than a non-descriptive one.There is no reason for Google to penalize a page just for using non-English characters in the URL. That would be rather racist without improving search results for users.If 5% of the threads being posted on your forum consistently contain Japanese in them, then clearly at least 5% of the activity on your forums is by users who use Japanese. And if that's the case, then it's reasonable to think that ~5% of your organic search traffic is also likely to contain Japanese. After all, it's rare for an established online community to suddenly change in demographic unless the operator intentionally changes their target audience.If for some odd reason you're being forced to choose between having good page content versus having Japanese URLs, then sure, go for the page content. But it's more likely that removing the Japanese characters won't improve any other SEO factors.