AI translation for papers

Papers, PDFs —
translated just right.

Re:Babel turns papers, PDFs, and web pages into readable bilingual documents — powered by AI OCR and translation.

No credit card required — free forever on the Free plan

Simple — just 3 steps

STEP 1

Add a PDF / URL

Just upload a paper PDF, or paste a web page or Markdown URL. Papers are organized into your Library.

STEP 2

AI OCR + Translation

AI reads the text chapter by chapter and translates it into Japanese, preserving context along with equation and figure references.

STEP 3

Read in the Bilingual Reader

Review the content in a reader that shows the original and translation side by side. Notes and glossary let you tailor it to your reading style.

Start for free. Upgrade anytime you need more.

Free

¥0

Recommended

Plus

¥500 / month

Pro

¥3,000 / month

Can I use it for free?: Yes. The Free plan requires no credit card and is free forever. You can try OCR and translation within your monthly page credits.
What kinds of documents are supported?: In addition to uploading PDFs, you can import web page URLs and Markdown. It's well suited for papers, technical documents, blog posts, and more.
How good is the translation quality?: Translations use the latest LLMs, applying chapter-level context, your glossary, and translation memory. Choose the quality that fits your needs: Fast / Balanced (and Deep on Pro).
Can I change or cancel my plan?: Anytime. Payments are securely processed by Stripe, and you can change or cancel your plan from the in-app plan screen.