At NAIway Translation Service, we are trusted by a wide range of corporate clients for our fast and high-quality legal translations. Our proven track record of excellence has earned us a strong reputation across the industry.
Legal documents—such as contracts, application forms, certificates, regulations, court-related materials, and government documentation—require not only precise terminology and standardized formatting, but also strict adherence to legal conventions. Even the slightest misinterpretation or deviation in legal texts can have serious consequences, making accuracy and consistency absolutely critical.
At NAIway, translations are handled by expert native and Japanese professionals with deep legal knowledge and extensive hands-on experience. Our translators understand the complexity of legal language and deliver precise, reliable translations you can count on.
While most of our legal translation work involves Japanese-English and English-Japanese, we are also seeing growing demand in Chinese, Thai, and other languages. We have legal translation specialists available across multiple languages—please feel free to contact us to discuss your needs.
All documents are handled with strict confidentiality under a secure information management system.

For more details, please feel free to contact us.
Request a Translation Quote
Please send us the source text for translation.
At NAIway, translation fees are estimated based primarily on the character or word count of the source text, as well as the target language and content complexity.
To receive an accurate and prompt quote, please either upload the source document via our Quote & Inquiry Form or provide the total character/word count.
Contact us to discuss your preferred budget and turnaround time.
We offer flexible solutions tailored to your needs by confirming key details such as the volume of content and desired translation quality. If you have specific preferences regarding budget or deadline, please don’t hesitate to let us know.
Relevant fields are available in our Quote & Inquiry Form.

Translation Fees at NAIway
Our regular translation fees cover all of the following services, so you can rely on us with confidence.
Translation
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Native-Level Quality Check
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After-Support※
※ As part of our after-support, we handle revisions and inquiries within the post-delivery verification
- The actual cost will be estimated based on the content and volume of the document. Please send us the document when requesting a quote.
- Minimum Charge Policy. Depending on the character/word count and other conditions, we have a two-tier minimum charge system of 5,500 Japanese Yen or 11,000 Japanese Yen (tax included). This ensures coverage of the essential costs involved in translation coordination and quality assurance.

For more details, please feel free to contact us.
Important Notes on Official Seal Certification and Apostille Procedures
We occasionally receive inquiries related to legal translation that include requests for official seal verification or the issuance of an apostille. Unfortunately, NAIway is not authorized to handle official seal certifications or apostille procedures.
Official seal verification is a prerequisite for obtaining consular authentication from foreign embassies or consulates in Japan. An apostille, on the other hand, is a form of certification under the Hague Convention Abolishing the Requirement of Legalization for Foreign Public Documents. Whether you require official seal verification or an apostille depends on the specific nature and destination of the document.
While we cannot provide these certifications, NAIway can issue a statement certifying that the translation was performed by us based on the original document. This certificate is prepared in the language of the translation and signed by an authorized representative. If such certification is needed, we kindly ask that you confirm with the Ministry of Foreign Affairs or the relevant authority in advance whether our certificate will be accepted for your specific use.

For more details, please feel free to contact us.
NAIway AI Translation x Check
Fast, affordable, and we even go a step further—using generative AI like ChatGPT not just for translation, but to craft emotionally resonant Japanese copy that truly speaks to local audiences.

In Japanese-English and English-Japanese translation, AI can achieve up to 97% accuracy when applied to suitable fields or well-structured source texts. However, in real-world professional translation, accuracy often falls below 90%. With NAIway’s “AI Translation + Expert Review”, we refine AI-generated translations (mainly for Japanese-English and English-Japanese—other languages available upon request) by:
✅ Eliminating AI-specific errors to deliver high-quality translations with faster turnaround times and lower costs, surpassing conventional translation standards.
✅ Having experienced translators thoroughly review the output against the original text.
Looking to break into the Japanese market but want to keep translation costs low?
Say your company is aiming to localize content—websites, brochures, or marketing assets—for Japan. You're thinking of using AI translation tools like DeepL, Google Translate, or ChatGPT to cut costs. But there's a problem: you don’t have someone in-house who truly understands Japanese well enough to review, refine, and adapt that output into something that resonates with a Japanese audience.
Translating into Japanese isn’t just about swapping words—it's about navigating entirely different sentence structures, cultural nuances, and communication styles. That’s why these “quiet but critical” steps matter:
✅ Rewriting for natural flow and clarity
✅ Adjusting tone and expressions to match native Japanese sensibilities
That’s where NAIway Translation Service comes in.
With 30 years of multilingual translation experience and a solid base in Japan, we specialize in taking AI-translated content and elevating it, polishing it into native-level Japanese that actually works in the Japanese market. From localization to compelling copywriting tailored for Japan, we bridge the gap between raw AI output and market-ready communication.
We even go a step further—using generative AI like ChatGPT not just for translation, but to craft emotionally resonant Japanese copy that truly speaks to local audiences. From rewriting to copy creation, we take on the heavy lifting to ensure your message hits home in Japan.
For more details, please feel free to contact us.
Multilingual Translation Support
At NAIway, we offer multilingual translation services. In addition to Chinese, you can request translations for English, Korean, Thai, and more—all simultaneously.
This eliminates the hassle of working with multiple translation providers for different languages. And of course, we ensure high-quality translations in every language we offer.

NAIway's Quality Assurance System
At NAIway Translation Service, we believe that quality management is our top priority as a professional translation company. To ensure the highest standards, we have developed our own Quality Assurance System (QAS) and implement strict quality control measures.
For high-quality Japanese-Spanish and Spanish-Japanese translations, every document undergoes a two-step review process: after the initial translation, a second translator conducts a thorough quality check.
We meticulously review each character and sentence, ensuring logical flow, terminology consistency, and appropriate expressions to deliver a refined translation tailored to your needs.

Documents We Handle & Examples of Our Work
- Various Contracts
- Various Application Documents
- Various Certificates
- Various Licenses
- Company Policy Documents
- Compliance Documentation
- Articles of Incorporation
- Internal Company Regulations
- Certified Copy of Company Registration
- Income Certificate
- Payslips / Salary Statements
- Withholding Tax Certificate
- Notarized Documents
- Written Pledge
- Expert Opinion / Appraisal Report
- Certificate of Residence
- Litigation-Related Documents
- Complaint / Statement of Claim
- Court Judgment
- Summons
- Statement of Defense
- Internal Control Reports
- J-SOX Compliance Documents
- Non-Disclosure Agreements (NDAs) / Confidentiality Agreements
- And more