BookTranslator.ai

BookTranslator.ai translates EPUB files while preserving the original formatting — chapter breaks, paragraph spacing, and text styling survive the translation intact. At $6.99–$9.99 per 100,000 words, it's one of the lowest per-word AI translation rates for book-length content.

What You Get#

• Smart Formatting: Translates EPUB content while maintaining the original layout and styling — chapters & headings, images & captions, footnotes, and fonts & styling all survive intact. Authors receive a translated file ready for publishing without reformatting work.
• Five-stage pipeline: Each job runs Extract → Analyze → Translate → Proofread → Reassemble, so a built-in proofreading pass cleans up the raw machine output before the EPUB is rebuilt.
• Basic vs. Pro tiers: Basic uses standard AI models suitable for most fiction and general nonfiction. Pro uses advanced models for complex literary, technical, or nuanced work requiring higher accuracy.
• Bilingual comparison tool: Places the original text alongside the translation for side-by-side review. Useful for authors with partial target-language knowledge or for hiring a spot-checker.
• 7-day money-back guarantee: Full refund if a translation fails, arrives corrupted, or is incomplete — contact within 7 days. This is a failure/defect guarantee, not a general "not satisfied with the quality" refund.
• EPUB format only: Input and output are both EPUB, keeping the workflow simple — translate, download, publish.

Who It's For#

• Budget-conscious authors: At $6.99–$9.99 per 100K words, a standard 70,000-word novel costs $49–$70 — among the most affordable options for AI translation.
• Authors who already format in EPUB: If your book is already an EPUB (from Vellum, Atticus, or Calibre), BookTranslator.ai fits directly into your workflow without conversion steps.
• Rapid market testing: Low cost makes it feasible to test multiple language markets before investing in human editing or high-quality AI refinement.

Pricing: Basic plan at $6.99 per 100,000 words; Pro plan at $9.99 per 100,000 words. Minimum order is $6.99. Prices are approximate — the final quote is calculated from token count, so word-count math is an estimate. A 70,000-word novel costs approximately $49 (Basic) or $70 (Pro). EPUB files under 50MB only.

Strengths#

• Low price floor: The lowest per-word rate among reviewed AI translation tools — meaningful for authors exploring multiple language markets simultaneously.
• Formatting is handled: Most AI translation tools output raw text requiring reformatting. BookTranslator.ai returns a formatted EPUB directly, eliminating post-translation production work.
• Transparent pricing: Per-word billing with no subscription means costs scale exactly with manuscript length. No hidden fees.
• Risk mitigation: The 7-day money-back guarantee covers failed, corrupted, or incomplete output — useful insurance against a botched job, though it does not refund translations you simply find low-quality.

Limitations#

• EPUB only: PDF, Word, and other formats are not supported. Authors working in other formats must convert to EPUB first, which can introduce formatting issues.
• Lighter refinement than literary tools: The pipeline includes a single automated proofread pass, but it is not the multi-pass literary refinement BookTranslate.ai runs. Expect to need post-translation human editing for literary fiction or nuanced dialogue.
• Quality varies by language pair: The vendor advertises "99+ languages," but AI output quality is uneven — European pairs outperform Asian, African, and indigenous languages. Verify your specific target pair with the free/small-job option before committing a full manuscript.
• File size limit: 50MB EPUB maximum may be restrictive for heavily illustrated books or books with embedded fonts.

Alternatives#

BookTranslate.ai offers multi-pass AI refinement at a higher per-character cost — better suited for literary fiction requiring publication-ready output. Reedsy Translators connects authors with human translators for the highest quality, at professional per-word rates.