Calculator

AI-powered Eiken study companion you want by your side

Real-time character, line, paragraph count

Japanese era ⇔ AD, age, zodiac

School enrollment & graduation years

Type Japanese in romaji (for overseas users)

Convert Japanese reading to Hangul (name use)

Paste DB/API timestamp, get date. Both ways.

Pick start and end dates to see total days

Monthly calendar of Japanese national holidays and rokuyō (six-day cycle)

Generate secure random passwords with letters, numbers, symbols

Upload a PDF and add form fields

Create QR codes from URL or text instantly

Convert images to WebP, same name with .webp extension

Convert WAV to MP3 in browser, choose bitrate

Resize by width, keep aspect ratio, batch up to 10

Create campaign URLs with UTM parameters

Generate .htpasswd line from ID & password

See your public IP as soon as you open the page

Paste an IP to see country/region hints

Enter a domain to list nameservers

Compare two sources; added/removed lines in color