Seating Arrangement Randomizer (yamada-tools.jp)
A free tool to randomly assign seats for classrooms or workplaces. Supports 100+ people with classroom grid display, print-ready seat charts, and presets for 1–40 students.
Zengin Format Converter (yamada-tools.jp)
A free online tool that converts Excel/CSV data into Zengin banking format files. Supports both salary transfer and aggregate transfer data creation, with secure processing on Japan-based servers. No registration required.
Base64 Converter (yamada-tools.jp)
A free online tool to encode and decode Base64. Supports both text and image files, with correct handling of Japanese characters via UTF-8 encoding. Processed securely on Japan-based servers with automatic deletion after 60 minutes.
Date Converter (yamada-tools.jp)
A free online tool that converts between Japanese era names (Reiwa, Heisei, Showa, Taisho, Meiji) and the Western calendar. Also displays the day of the week and Chinese zodiac sign. No registration required.
Furigana Converter (yamada-tools.jp)
A free online tool to automatically add furigana (reading aids) to kanji text. Supports hiragana, katakana, and romaji output. No registration required, processed securely on Japan-based servers with automatic deletion after 60 minutes.
Phone Number Formatter (yamada-tools.jp)
Free online tool that formats phone number strings with correct hyphens. Identifies area codes for mobile phones, landlines, and toll-free numbers and inserts hyphens in correct positions. No registration required.
Postcode Search (yamada-tools.jp)
Free online tool to search addresses from postal codes or vice versa using Japan Post data. Supports large business postal numbers with instant results and automatic 7-digit input detection. No registration required.
Tsubo Area Converter (yamada-tools.jp)
A free online tool that converts between tsubo (坪) and other area units including square meters, tatami mats, square feet, square yards, acres, hectares, and more. Also supports Korean pyeong and Taiwanese ping.
Unit Converter (yamada-tools.jp)
A free online unit conversion tool that instantly converts between 50+ unit types including length, weight, area, volume, temperature, time, and data. Also supports Japanese-specific units such as shaku, tsubo, and tatami.
URL Encoder / Decoder (yamada-tools.jp)
A free online tool to encode and decode URL strings. Converts characters that cannot be used in URLs into percent-encoded format, making it useful for building URLs that include Japanese or other non-ASCII text, as well as for handling query parameters.
Zenkaku/Hankaku Converter (yamada-tools.jp)
A free online tool to batch-convert between full-width and half-width characters, supporting numbers, alphabets, katakana, and spaces. Useful for formatting data from Excel and other sources. Processed securely on Japan-based servers.
Business Card Creator (yamada-tools.jp)
Create simple and beautiful business cards for free. Just enter your company name, name, and contact details. QR code business cards are also supported. Print-ready PDF output available.