# BookTranslator.ai

> Budget-friendly EPUB AI translation with Smart Formatting that preserves chapter layout and styling across 99+ languages.

Source: https://selfpublishingdirectory.com/translation/booktranslatorai
Website: https://booktranslator.ai
Category: Translation Services (https://selfpublishingdirectory.com/translation)
Pricing: paid — $6–$10/per-project
AI-powered: yes
Tags: ai-translation, epub, affordable, pay-per-use, multiple-languages, formatting-preservation, per-word
Last verified: 2026-06-18
Best For: Budget-first authors testing multiple language markets; lowest per-word AI rate for EPUB-native manuscripts with no subscription commitment
Languages Supported: spanish, french, german, italian, portuguese, dutch, japanese, korean, chinese-simplified, other-european, other-asian, other
Model: per-word
Service Type: ai-translation

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.