hayaku.online

About hayaku.online

hayaku.online is a set of free, no-signup utilities designed to run in your browser whenever possible.

What we offer

Japan take-home / personal tax estimate (Reiwa 8 / 2026) — estimates only, not for filing.
PDF merge & split — processed on your device, not uploaded to our servers for processing.
JSON format & minify — local pretty-print and minify.

What we care about

Privacy by default, low friction, and clear limits.

Languages

Japanese, Chinese, and English.

Operator

Operator: Hayaku Online (X: @HayakuOnline)
Site: https://hayaku.online
Contact: https://x.com/HayakuOnline

Feedback

Feature ideas, copy fixes, and estimate questions: contact us on X (@HayakuOnline) at https://x.com/HayakuOnline. For formal tax advice, consult a professional or tax office.