みらい翻訳
: How to use it, features, and the business problems it solves
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What is みらい翻訳?
High-security AI machine translation from Mirai Translate, Inc., an NTT DOCOMO Group company. The enterprise "Mirai Translate FLaT" offers unlimited-volume, unlimited-seat plans (from 250,000 yen/month, tax excl.) across 20 languages, while "Mirai Translate Plus" for individuals has a free plan and paid plans from 550 yen/month (tax incl.). Translation data is never reused, with ISO27017 certification and a SOC 2 report.
Business problems it solves
About "みらい翻訳"
What is Mirai Translate?
Mirai Translate is a high-security AI machine translation service provided by Mirai Translate, Inc. (Shibuya, Tokyo), a member of the NTT DOCOMO Group. It is known for translation accuracy that the company officially describes as "on par with a business professional scoring 960 on TOEIC," and for a security design in which customer translation log data is never reused for accuracy improvement. The service is built primarily for Japanese companies — especially manufacturers — and government agencies.
The current lineup centers on two products: Mirai Translate FLaT for organizations (an AI translation platform succeeding the former Mirai Translator®, with a plan offering unlimited users and translation volume) and Mirai Translate Plus, which individuals and small teams can use from a single seat and a single month. The company also offers Listening Assistant for real-time speech translation, AI Video Subtitles for translated subtitles on video files, a patent-specialized translation model, and an API service for embedding translation into your own systems.
How to use
- Choose a plan — For company- or department-wide deployment, apply for the free trial of Mirai Translate FLaT. For individuals or small teams, create an account for Mirai Translate Plus and start immediately on the free plan. The official site also has an "Otameshi AI Honyaku" (trial AI translation) page where you can test quality without registering.
- Translate text — Paste text into the browser-based translation screen to get the translation. Data from text translation is designed to be deleted immediately after display.
- Translate entire files — Upload Word (.docx), Excel (.xlsx), PowerPoint (.pptx), PDF, or text files and receive translated files with the layout preserved. FLaT's PDF translation offers two modes: "translation priority" and "layout priority."
- Build your user dictionary and translation memory — Register company names, product names, and technical terms in the dictionary, and accumulate past translation pairs in translation memory to bring output closer to your organization's phrasing.
- Polish with generative AI proofreading (FLaT) — A feature implemented in March 2026 that keeps the accuracy of neural machine translation while generative AI refines the output into more natural wording.
Key features
01Text and file translation
- Text translation — FLaT supports 20 languages, Plus supports 14. Accuracy officially described as TOEIC 960 level
- File translation — Translates Word, Excel, PowerPoint, PDF, and text files while preserving layout. FLaT's "layout priority mode" faithfully reproduces images and formatting
02Raising translation quality across the organization
- User dictionary — Standardize translations of proper nouns and technical terms
- Translation memory — Reuse your existing translation assets
- Generative AI proofreading (FLaT) — Combines machine translation accuracy with generative AI fluency (implemented March 2026)
- Specialized models — Translation models specialized for legal and patent documents
03Speech, video, and API
- Listening Assistant — Real-time translation of meeting audio (10 languages; major renewal in February 2026)
- AI Video Subtitles — Automatically generates translated subtitles from video files
- API service — Embed the translation engine into your own systems and internal tools
Pricing
All prices below are as officially listed on August 19, 2026.
Mirai Translate Plus (individuals and small teams / tax included)
| Plan | Monthly billing | Annual billing (per month) | Text translation | File translation | Users |
|---|---|---|---|---|---|
| Free | 0 yen | 0 yen | Up to 5,000 characters/day | 1 file/month | 1 user |
| Starter | 550 yen | 495 yen | Up to 20,000 characters | 10 files/month | Up to 10 users |
| Standard | 2,970 yen | 2,475 yen | Unlimited (system limits apply) | 30 files/month | Up to 50 users |
| Premium | 5,940 yen | 4,950 yen | Unlimited (system limits apply) | 120 files/month | Up to 50 users |
Both monthly and annual contracts renew automatically.
Mirai Translate FLaT (organizations / tax excluded)
| Plan | Price | Details |
|---|---|---|
| Volume-based | From 0.3 yen per word | 1–500 users. Tiered from 120,000 words/year (120,000 yen/year) to 20 million words/year (6 million yen/year) |
| Unlimited | From 250,000 yen/month | Unlimited users and translation volume. For company-wide deployment |
Individual prices for options such as specialized models and the API are not published (inquiry required).
Free plan and trial
- Mirai Translate Plus Free plan — Free with no time limit. Text translation up to 5,000 characters per day, file translation 1 file per month. Even on the free plan, translation data is never reused.
- FLaT free trial — A trial for organizations, requested via the official site (duration and terms provided at application).
- Trial AI translation — A page on the official site lets you check translation quality before registering.
Japanese language support
- UI: Fully in Japanese. Developed by a Japanese company for Japanese business users; the console, help, and contracts are all completed in Japanese.
- Input/output: Japanese to and from English, Chinese (Simplified and Traditional), Korean, and more — 20 languages on FLaT and 14 on Plus. Development centers on the quality of Japanese business document translation.
- Support and billing: Japanese-language support from a domestic company; pricing is in yen.
Reputation and track record
- The official site states that the company's AI translation services are used by over 800,000 business users.
- Named FLaT case studies published on the official site include INPEX, Stanley Electric, Proterial, Mitsuboshi Belting, Aisan Industry, and Matsuo Seisakusho — manufacturers and energy companies.
- In November 2025, FLaT and Mirai Translator® obtained a SOC 2 Type 2 report. The company also states it was the first domestic cloud machine translation service to obtain ISO27017, steadily accumulating third-party security assessments.
How it differs from other tools
| Product | Provider | Individual pricing entry point | Characteristics |
|---|---|---|---|
| Mirai Translate | Japan (NTT DOCOMO Group) | Free / 550 yen (tax incl.)/month | No secondary use of translation logs, servers in Japan, ISO27017/SOC 2. Unlimited plan for organizations |
| DeepL | Germany (DeepL SE) | Free / 1,380 yen (tax incl.)/month | Renowned for natural output. 30+ languages, broad product line including Write, Voice, and API |
| WOVN.io | Japan | For businesses (inquiry required) | Specializes in multilingualizing websites themselves — a localization platform, not a translation tool |
| Rask AI | USA | Paid plans only | Specializes in video dubbing and subtitle translation |
The most common comparison is with DeepL. DeepL has the edge in fluency, language coverage, and ease of use for individuals, while Mirai Translate stands out by explicitly committing to no secondary use of translation data on every plan (including free), with domestic server processing, ISO27017, SOC 2, and compliance with Japan's Ministry of Internal Affairs requirements. For companies and government agencies whose security policies prohibit sending internal documents to overseas services, it is effectively the first choice. To multilingualize an entire website, consider WOVN.io; for video subtitles and dubbing, a specialized tool like Rask AI is a better fit.
FAQ
Q. Can individuals use it? Yes. It was once business-only, but Mirai Translate Plus, launched in January 2024, can be purchased per license and includes a free plan.
Q. Is there a free option? Yes: the Plus free plan (5,000 characters of text per day, 1 file per month), the pre-registration trial translation page, and the FLaT free trial for organizations.
Q. Will my translations be used to train AI? No. The company explicitly states that translation log data is never reused, on all services including the free plan. Text translation data is deleted immediately after display, and file translation results are automatically deleted after 10 days.
Q. Should I choose Mirai Translate or DeepL? Organizations that prioritize security requirements (domestic servers, no secondary use, certifications) should choose Mirai Translate; if language coverage and individual convenience matter most, DeepL is the candidate. See the comparison above.
Q. Can I cancel anytime? Plus renews automatically (monthly for monthly billing, yearly for annual billing), and you cancel in line with the renewal timing. Confirm FLaT contract terms when you inquire.
About the provider
Mirai Translate, Inc. Founded October 30, 2014, headquartered in Shibuya, Tokyo. Shareholders are NTT DOCOMO (61.01%), NTT DOCOMO Business (17.56%), Panasonic (12.45%), and Honyaku Center (8.99%); the company specializes exclusively in developing, selling, and operating translation-focused AI. The president and CEO is Daisuke Torii. It holds ISO27001 and ISO27017 certifications and complies with GDPR.
The information on this page is based on the content published on the official website as of August 2026. Features and pricing are subject to change; please check the official website for the latest information.
