Drop a PDF.
Get it translated.
AI-powered translation for entire PDFs — research papers, textbooks, contracts, any length. Upload, pick a language, done.
50 free credits/month · No credit card required
research-paper-2026.pdf
142 pages · 8.3 MB
13
Languages
7
AI Models
500+
Max Pages
PDF & Word
Output Formats
AI translation breaks
on long documents.
Paste a 200-page PDF into ChatGPT and watch it choke. Context window exceeded, paragraphs silently dropped, quality collapses halfway through.
Without TransDocs
- Context window exceeded — content silently dropped
- Quality degrades after page 20–30
- Manual copy-paste, chapter by chapter
- Inconsistent terminology throughout
- No progress tracking on large files
With TransDocs
- Smart chunking — every page translates cleanly
- Context carried forward, consistent terminology
- One click upload, fully automatic
- Works on 10-page papers and 500-page books
- Real-time progress for every chapter
Upload. Configure. Download.
Three steps. No manual splitting, no babysitting.
Upload your PDF
Drag and drop any PDF — up to 50 MB. Batch upload up to 10 files at once.
Pick language & model
Choose from 13 languages and 7 AI models. Source language auto-detected.
Download translation
Get your translated PDF or Word doc. Bilingual side-by-side available.
Smart Chunking keeps every chapter in context
TransDocs detects chapter boundaries, splits your PDF intelligently, and carries context forward so terminology stays consistent from page 1 to page 500.
research-paper-2026.pdf
142 pages · 6 chapters detected
Chapter 1: Introduction
Chapter 2: Literature Review
Chapter 3: Methodology
Chapter 4: Results
Chapter 5: Discussion
Chapter 6: Conclusion
See the quality for yourself
Real translation samples. No cherry-picking — this is what you get.
English
Recent advances in quantum computing demonstrate that error-corrected logical qubits can achieve fault-tolerant operations at scale. Our architecture utilizing topological codes achieved 99.7% fidelity across 1,000 consecutive gate operations, suggesting practical quantum advantage for molecular simulation within the next decade.
繁體中文
量子計算領域的最新進展表明，糾錯邏輯量子位元可以在大規模上實現容錯操作。我們利用拓撲碼的架構在1,000次連續閘極操作中實現了99.7%的保真率，這顯示用於分子模擬的實用量子優勢可能在未來十年內實現。
Three professional layouts
Choose the output style that matches your document. Standard for everyday use, Book for long-form reading, Business for reports and contracts.
Clean & minimal — best for most documents
Everything you need.
Nothing you don't.
Smart Chunking
Auto-splits by chapters and headings. Each chunk carries forward context for coherent, accurate translations.
13 Languages
English, Chinese, Japanese, Korean, Spanish, French, German, Portuguese, Vietnamese, Thai, Arabic, Russian, and more.
7 AI Models
Claude Sonnet, Claude Opus, GPT-5.2, Gemini Flash, Gemini Pro, and more. Pick the best for your budget.
Real-time Progress
Watch every chapter translate live. No staring at a spinner wondering if it crashed.
BYO API Key
Bring your own API key from OpenRouter, OpenAI, Anthropic, or Google. Pay provider rates, zero markup.
Secure & Private
Documents processed in memory, never stored. Encrypted connections. Deleted after download.
Simple pricing. Start free.
Upgrade when you need more pages. Cancel anytime.
- 300 credits/month
- All 8+ models
- No watermark
- Translation history (90 days)
- Email support
- 1,000 credits/month
- All models including Opus & GPT-5
- AI Professional Edit (Translation, Editing, Proofreading)
- Quality scoring & glossary
- Unlimited history
- 3,000 credits/month
- All models including Opus & GPT-5
- Translation, Editing, Proofreading + Back-Translation
- Style guides & glossary
- Dedicated support
Need more? Add-on credits at $0.10/credit on any paid plan.
Bring your own API key for unlimited translations at provider cost.
Frequently asked questions
Why do other AI translators fail on long PDFs?
Most tools feed the entire document into one AI prompt. When a PDF exceeds the model's context window, the AI silently drops content, hallucinates, or produces garbled output. TransDocs solves this by intelligently splitting your document into chapter-sized chunks, each carrying context from prior sections, so every page translates perfectly regardless of total length.
What languages are supported?
TransDocs supports 13 languages including English, Traditional Chinese, Simplified Chinese, Japanese, Korean, Spanish, French, German, Portuguese, Vietnamese, Thai, Arabic, and Russian. Source language is auto-detected, and you can translate between any combination of supported languages.
How does the BYO API Key option work?
If you have an API key from OpenRouter, OpenAI, Anthropic, or Google, you can enter it in your account settings to use your own API credits for translations. You pay only the provider's token rates with zero markup from us. This is perfect for power users who want unlimited translations at cost.
Is my document data safe?
Yes. Your PDFs are processed in-memory on our servers and are never written to disk or stored in a database. The original file and translated output are deleted from temporary storage after you download the result. We use encrypted connections (TLS) for all data transfers.
What PDF formats work best?
TransDocs works with any text-based PDF. Scanned image PDFs (without OCR text layers) are not currently supported. For best results, use PDFs with clear heading structure — our smart chunker uses headings, font sizes, and page breaks to find optimal split points.
Can I translate a 500-page book?
Absolutely. That's exactly what TransDocs is built for. Our smart chunking engine handles documents of any length by breaking them into coherent chapter-sized pieces, translating each with full context, and reassembling the result. A 500-page book typically takes 10-20 minutes depending on the AI model you choose.
Your next PDF, translated perfectly.
Join researchers, students, and professionals who trust TransDocs for accurate, full-length PDF translations.
50 free credits/month · No credit card required