Dougudana Tools

Small, private tools that run entirely in your browser

Date & Time

Japan Business Days CalculatorCount business days in Japan or find the date N business days ahead. Japanese public holidays are computed automatically.Day Counter — Days Between, Days UntilDays between two dates, the date N days from now, and anniversary counters with upcoming milestones — all in one place.

Text

Genkō Yōshi (Japanese Manuscript Paper) CalculatorConvert Japanese text into 400-character manuscript-paper pages, simulating real line breaks — plus character and word counts.

Images

Batch Image Resizer — No UploadResize and convert multiple images at once. Everything happens locally in your browser — your images never leave your device.