ex. 01
特定健診のお知らせ
tokutei kenshin no oshirase
Medical
Specific Health Checkup Notification
A free annual checkup, paid for by the city. Includes a voucher for use at a designated clinic.
Register before the voucher expires
Jan 31
01·For people living in Japan who don’t read Japanese
Your Japanese mail, explained — and what to do about it.
Photograph any letter from city hall, the tax office, immigration, your bank or your landlord. Jozu translates it into plain English, tells you what it wants from you, and reminds you before the deadline.
- 14 days, 3 documents free. No card.
- Then ¥2,500/month. Cancel anytime.
- Document text encrypted with a key unique to you.
令和8年10月6日品川区長
令和8年度
特別区民税・都民税 納税通知書
前年中の所得に基づき算出した住民税額を
お知らせします。同封の納付書により、
下記の納期限までに納付してください。
お知らせします。同封の納付書により、
下記の納期限までに納付してください。
| 納期限 | 納付額 |
| 令和9年1月13日 | 48,600円 |
品川
区印
区印
Tax
Residents’ Tax Payment Notice
From Shinagawa City Office
What it says
Your residents’ tax, based on last year’s income. A payment slip is enclosed for a bank, post office or convenience store.
What to do
Pay ¥48,600
Due
Jan 13
Alert saved. Email reminders on Jan 6 and Jan 12.
Can I pay this at a konbini?
Yes, if the slip has a barcode. Take it to a convenience store before Jan 13.
What Jozu does
Not just translated
A plain-English summary, what you need to do, and the amounts and dates, pulled out.
Deadlines, with reminders
Save a date as an alert and get an email before it’s due.
Every letter, filed
Sorted into Tax, Medical, Immigration, Housing and more. Searchable in English.
Private by design
Your documents’ text and translations are encrypted with a key unique to your account. Never sold, and never used to train AI.
02·The kind of paperwork Jozu reads
What Jozu tells you
about the letters in your mailbox.
Examples of letters that arrive in mailboxes across Japan every month, with what each one says and the date you need to know about.
ex. 02
国民健康保険料納付通知書
kokumin kenkō hokenryō nōfu tsūchisho
Tax
National Health Insurance Premium Notice
Annual premium broken into four quarterly installments. Includes payment slips for konbini or bank.
First installment
Jul 31
ex. 03
在留資格更新申請のご案内
zairyū shikaku kōshin shinsei no goannai
Immigration
Residence Status Renewal Guidance
Reminder to begin the residence-card renewal process. Lists required documents and the application window.
Submit no later than
Mar 14
ex. 04
住民税納税通知書
jūminzei nōzei tsūchisho
Tax
Residents’ Tax Payment Notice
The city portion of last year’s income tax, split across four installments. Itemised by ward and prefecture.
First installment
Jun 30
03·How it works
From mailbox to understood.
01Photograph
Take a photo.
Whatever’s in your hand — a flyer from city hall, a notice from the post office, a letter you don’t recognise. Phone camera, scanner, screenshot: a photo, a PDF, or pasted text. The format doesn’t matter; the document does.
02Read
Jozu reads it.
Built for Japanese officialese — the formal turns of phrase that appear in tax notices, health-insurance forms, and immigration letters but nowhere else. You get a faithful, line-by-line English translation that keeps the document’s structure, and a short brief at the top: what it is, who sent it, and what it expects of you.
03Ask
Ask follow-ups.
Anything you didn’t understand — “Do I actually need to attend this?”, “What is a 住民税?”, “Can I pay this at the konbini?” — ask in either language. The answers are about your document, not generic web results.
04Keep
Keep on top of it.
Deadlines and amounts are pulled out to the top of the document. Save a deadline as an alert and Jozu emails you before it’s due (a week and a day ahead, by default), so it’s harder to miss. Every letter is filed under a category and searchable in English.
04·Privacy & security
Your tax letters are nobody else’s business.
The paperwork Jozu reads is some of the most personal you own: your address, your income, your residence status. Here’s how it’s kept that way.
Encryption
Encrypted with a key unique to you.
Before Jozu saves a document’s text, its translation, the details it pulled out, or an alert note, it encrypts them with AES-256-GCM using a key that belongs to your account alone. Someone reading our database directly sees those fields only as ciphertext. Documents saved before February 2026 may not have this extra encryption.
Storage
Files kept in private storage.
The photos and PDFs you upload are stored privately. Other users can’t reach them; only your account and Jozu’s own servers can read them.
In transit
Encrypted on the way, too.
Everything travels over HTTPS, and the providers we use encrypt stored data at rest.
Your data
Never sold. Never used to train AI.
We don’t sell your information and we don’t show ads. Your documents are not used to train AI models: Anthropic, whose AI reads them for Jozu, processes them under commercial terms that exclude training.
Sign-in
Optional two-factor sign-in.
Turn on two-factor sign-in in Settings and Jozu asks for a code from your authenticator app each time you sign in.
Alerts
An email when a new browser signs in.
If your account is signed into from a browser we haven’t seen before, we email you with the time and the type of browser, so you’d notice if it wasn’t you.
05·Pricing
One plan. Everything in it.
No tiers and no per-document fees. Try Jozu on your own letters first: the trial needs no card, and when it ends nothing is charged unless you choose to subscribe.
Jozu Pro
¥2,500/ month
The price you see is the price you pay. Nothing is added at checkout.
- Unlimited documents
- Line-by-line translation and a plain-English summary
- Deadlines and amounts pulled out for you
- Alerts with email reminders
- Chat about every document
- Free trial
- 14 days with 3 documents. No card needed.
- Cancel anytime
- From the Billing page. You keep access until the end of the month you’ve paid for.
06·Questions
Before you ask.
Jozu is built for the formal Japanese of official letters, but it is still AI: it can misread a blurry photo or miss a date.
For anything that matters, like an amount, a deadline, or where to send something, check it against the original, which stays attached to every document in Jozu.
No. Jozu explains what a document says and what it seems to ask of you. It isn’t a lawyer, a tax accountant or a licensed administrative scrivener (gyoseishoshi), and the assistant will tell you so. For a decision with real consequences, ask the office that sent the letter or a licensed professional.
A photo (JPEG, PNG or HEIC) or a PDF, up to 10 MB, from your phone’s camera, a scanner or a screenshot. You can also paste Japanese text straight in, such as an email.
Jozu reads Japanese and writes English: translations and summaries are in English only. You can ask the assistant your questions in English or Japanese.
A translation app gives you the words. Jozu also tells you what they mean for you: a plain-English summary of what the letter wants, the deadline and amount pulled out, an alert that emails you before it’s due, the letter filed under its category and searchable in English, and a chat that knows the document you’re asking about.
Other users can’t. Your files sit in private storage, and the text, translation and details of each document are encrypted with a key unique to your account. We never sell your data or use your documents to train AI.
To read a document, Jozu sends it to Anthropic’s AI, which processes it under commercial terms that exclude training. The Privacy Policy lists every provider we use and what each one handles.
Yes, anytime, from the Billing page. Your subscription stops renewing and you keep full access until the end of the month you’ve paid for. Partial months aren’t refunded. After that you can still sign in and view the documents you’ve added.
Yes. Jozu runs in your phone’s browser, and you can add it to your home screen so it opens like an app. There’s no app store and nothing separate to download.
On iPhone
- 01Open getjozu.com in Safari.
- 02Tap the Share button.
- 03Choose "Add to Home Screen".
- 04Tap "Add".
On Android
- 01Open getjozu.com in Chrome.
- 02Tap the three-dot menu.
- 03Choose "Add to Home screen".
- 04Tap "Add".