No — tipping is not expected in Japan for everyday services such as restaurants, bars, cafes, taxis, and hotels. According to the Japan National Tourism Organization (JNTO), leaving a tip is uncommon and can cause discomfort or confusion; staff may even chase you down to return money left on the table.
Some restaurants add a service charge to the bill instead of expecting a tip. In limited situations — for example with a private guide or interpreter used to overseas customs — a discreet gratuity called kokorozuke may be accepted, ideally placed in a small envelope, but it is never required. JNTO advises travelers to express thanks politely rather than tip (Travel Japan / JNTO).
Source: JNTO: Tipping in Japan
Image: Kaitenzushi restaurant interior, photo by Savannah Rivka, CC BY-SA 4.0, via Wikimedia Commons.