# Belin Doc

> Belin Doc is a free, unlimited AI document translation platform. Translate PDF, DOCX, EPUB, PPTX, XLSX, TXT, JPG, PNG and more while perfectly preserving original layouts. Powered by ChatGPT, Claude, Gemini, and DeepSeek. No registration required. Supports 60+ languages. 100K+ monthly active users. 4.9/5 rating.

## Core Translation Tools

- [PDF Translator](https://belindoc.com/tools/free-pdf-translator): Translate PDF files while preserving complex layouts, fonts, and images. Supports scanned PDFs via OCR.
- [Excel Translator](https://belindoc.com/tools/excel-translator): Translate spreadsheet data in .xlsx format while keeping formulas and formatting intact.
- [PPT Translator](https://belindoc.com/tools/ppt-translator): Translate PowerPoint presentations while maintaining the original slide design.
- [EPUB Translator](https://belindoc.com/translate/epub-translator): Translate e-books with chapter structure and formatting preserved.
- [Manga Translator](https://belindoc.com/translate/manga-translator): Translate manga and comics with OCR support for vertical text and speech bubbles.
- [Video Translator](https://belindoc.com/video-translator): Translate video subtitles with AI voiceover generation. No original subtitles required.
- [Subtitle File Translator](https://belindoc.com/video-translator/video-subtitle-translator): Translate SRT subtitle files with timing codes preserved across 100+ languages.
- [Documentary Translator](https://belindoc.com/video-translator/documentary-translator): Broadcast-grade SRT subtitle and script translation for filmmakers and festival submissions.
- [Podcast & Interview Translator](https://belindoc.com/video-translator/interview-podcast-translator): Conversational SRT subtitle and transcript translation for podcasters and interview creators.
- [Blueprint Translator](https://belindoc.com/translate/blueprint-translator): Translate CAD files, engineering drawings, and technical blueprints.

## Premium Translation Service

- [AI Agent Premium Translation](https://belindoc.com/premium-translation): Higher-quality translation for high-stakes documents (contracts, tenders, annual reports, manuals). A team of specialized AI agents rebuilds document structure, applies a per-document glossary, and self-checks page by page. First page free to preview quality; pay only if the sample works. Priced per document.

## PDF Tools

- [Compress PDF](https://belindoc.com/tools/compress-pdf): Reduce PDF file size without compromising quality.
- [Merge PDF](https://belindoc.com/tools/pdf-merge): Combine multiple PDF files into a single document.
- [Split PDF](https://belindoc.com/tools/pdf-split): Extract specific pages or split a PDF into smaller files.
- [PDF to EPUB](https://belindoc.com/tools/pdf-to-epub): Convert PDF documents to reflowable EPUB format for e-readers.
- [PDF to Markdown](https://belindoc.com/tools/pdf-to-md): Convert PDF content to clean, editable Markdown text.

## AI Models

- [AI Models Overview](https://belindoc.com/ai-models): Overview of supported AI translation models (ChatGPT, Claude, Gemini, DeepSeek).
- [Gemini 3 Integration](https://belindoc.com/ai-models/gemini-3): Gemini 3 model features and translation capabilities.
- [GPT-5-2 Integration](https://belindoc.com/ai-models/gpt-5-2): GPT-5.2 model features and translation capabilities.
- [DeepSeek V3 Translator](https://belindoc.com/ai-models/deepseek-v4): DeepSeek V3 MoE reasoning applied to format-preserving PDF and document translation.
- [GPT-4.1 Translator](https://belindoc.com/ai-models/gpt-4-1): GPT-4.1 instruction-following precision for glossary-controlled document translation.

## Popular Language Pairs

- [English to Chinese](https://belindoc.com/translate/english-chinese_simplified)
- [Chinese to English](https://belindoc.com/translate/chinese_simplified-english)
- [English to Japanese](https://belindoc.com/translate/english-japanese)
- [Japanese to English](https://belindoc.com/translate/japanese-english)
- [English to Korean](https://belindoc.com/translate/english-korean)
- [Korean to English](https://belindoc.com/translate/korean-english)
- [English to German](https://belindoc.com/translate/english-german)
- [German to English](https://belindoc.com/translate/german-english)
- [English to Spanish](https://belindoc.com/translate/english-spanish)
- [Spanish to English](https://belindoc.com/translate/spanish-english)
- [Chinese to Japanese](https://belindoc.com/translate/chinese_simplified-japanese)
- [Japanese to Chinese](https://belindoc.com/translate/japanese-chinese_simplified)

## Pricing

- [Pricing Plans](https://belindoc.com/pricing): Free ($0/month), Pro, and Max subscription tiers. Free plan has no page limits per translation.

## FAQs

- [FAQ Index](https://belindoc.com/faqs): All frequently asked questions about document translation.
- [Advantages of AI Document Translation](https://belindoc.com/faqs/advantages-of-ai-document-translation)
- [How to Translate Scanned Documents (OCR)](https://belindoc.com/faqs/how-to-translate-image-or-scanned-documents)
- [How to Generate Bilingual PDFs](https://belindoc.com/faqs/how-to-generate-bilingual-pdf)
- [How to Batch Translate Documents](https://belindoc.com/faqs/how-to-batch-translate-documents)
- [How to Translate Very Large PDFs](https://belindoc.com/faqs/how-to-translate-very-large-pdf)
- [How to Add Glossaries During Translation](https://belindoc.com/faqs/how-to-add-glossary-in-document-translation)
- [Why PDF Has Two Text Layers After Translation](https://belindoc.com/faqs/why-pdf-has-two-layers-of-text-after-translation)
- [Engineering PDF Translation Difficulties](https://belindoc.com/faqs/engineering-pdf-translation-difficulties)
- [Private Deployment Solution](https://belindoc.com/faqs/belindoc-private-deployment-solution)
- [Video Translation Difficulties](https://belindoc.com/faqs/difficulties-in-online-video-translation)
- [High-Quality Video Simultaneous Translation](https://belindoc.com/faqs/how-to-achieve-high-quality-video-translation)

## Blog

- [Top 10 Best Document Translation Tools in 2026](https://belindoc.com/blog/top-10-document-translation-tools-2026)
- [How to Use AI to Translate PDF, Word & PPT](https://belindoc.com/blog/how-to-use-ai-translate-documents)
- [Engineering Drawing Translation Guide](https://belindoc.com/blog/engineering-drawing-translation-guide-maintain-layout)
- [Translate DWG & DXF Files Online: Native CAD Translation Without PDF Export](https://belindoc.com/blog/translate-dwg-dxf-cad-files-online)
- [GPT-5 Mini vs Gemini 2.5: AI Translation Benchmark 2025](https://belindoc.com/blog/ai-translation-model-benchmark-gpt5-vs-gemini)
- [Scanned PDF Translation Errors: Complete OCR Fix Guide](https://belindoc.com/blog/translating-scanned-pdf-ocr-guide-fix-errors)
- [How to Translate EPUB in 2026](https://belindoc.com/blog/how-to-translate-epub-with-belin-doc-2026)
- [Translating Vertical Text in Japanese/Chinese PDFs](https://belindoc.com/blog/translate-vertical-text)
- [Video Translation Guide: Subtitles & AI Voiceover](https://belindoc.com/blog/online-video-translation-guide)
- [GPT-5.2 Document Translation Review](https://belindoc.com/blog/gpt-5-2-document-translation-review)
- [Gemini 3 Translation Performance Review](https://belindoc.com/blog/gemini-3-translation-performance-review)
- [BelinDoc Troubleshooting: Double Text, Failures, Formatting](https://belindoc.com/blog/belindoc-translation-faq-troubleshooting)
- [How to Translate Excel Files While Keeping Formulas](https://belindoc.com/blog/how-to-translate-excel-files-keep-formulas)
- [AI Novel Translation Complete Guide 2026](https://belindoc.com/blog/ai-novel-translation-guide-2026)
- [Editable PDF Translation and Post-Editing Guide](https://belindoc.com/blog/belindoc-pdf-translation-post-editing)

## Changelog

- [Changelog](https://belindoc.com/changelog): Product version history and feature releases since launch (v1.0.0, July 26, 2025).

## Legal

- [Privacy Policy](https://belindoc.com/privacy): Data handling policy. Uploaded files are deleted within 24 hours after translation.
- [Terms of Service](https://belindoc.com/terms): Usage terms and restrictions. Service governed by PRC law.
- [Business Cooperation](https://belindoc.com/business-cooperation): Partnership, affiliate, and enterprise opportunities.

## Site Resources

- [Sitemap](https://belindoc.com/sitemap.xml): Complete XML sitemap index for all pages across 9 language locales.
- [robots.txt](https://belindoc.com/robots.txt): Crawler access rules (all crawlers allowed).