10 Best PDF Translation Tools in 2026: Tested and Compared 268

What tool should you use to translate PDF files? This article compares 10 PDF translation tools, including iFlytek Translate, Google Translate, Huiyi, and UPDF, to help you choose the right solution based on document type, including academic paper translation, business document translation, free PDF translation, and translation while editing. For papers, formulas, and two-column PDFs, tools such as Wordvice AI, Kaolan Academic, and Immersive Translate are recommended; for business documents, you can choose iFlytek Translate, DeepL, or Smartcat; and for fast, free translation, you can use Google Translate and Huiyi. Here is a detailed comparison:

1. iFlytek Translate

A translation product from iFlytek, covering text, documents, speech, images, and other use cases, with strong Chinese-language translation capabilities.

Features:

Supports document upload and translation for PDF, Word, PPT, and other formats

Supports translation between multiple languages

Provides web, desktop, and mobile access

Can leverage iFlytek AI translation capabilities to process long documents

Advantages: Well adapted to Chinese-language contexts and suitable for meeting materials, business documents, technical materials, and similar use cases; integrates easily with the iFlytek ecosystem.

Official website: https://www.iflytranslate.com/

2. Huiyi

An AI translation tool for PDFs, documents, web pages, images, and other use cases, supporting multiple model switching and side-by-side bilingual reading.

Features:

• Supports PDF upload translation and OCR recognition of scanned documents

• Can export side-by-side bilingual PDFs

• Integrates models such as DeepL, Claude, Gemini, GPT-4o, and Qwen

• Supports hover-to-translate, AI summaries, and AI Q&A

• Provides a browser extension and desktop client

Advantages: Strong format restoration, making it suitable for papers, contracts, and technical documents; flexible model selection and generous free features.

Official website: huiyiai.net

3. DeepL

An AI translation platform renowned for the naturalness of its translations, supporting text and document translation.

Features:

• Supports document translation for PDF, Word, PPT, and other formats

• Supports glossaries

• Provides a web version, desktop app, and API

• Allows adjustment of formality and tone

Advantages: Offers high-quality translations for European languages and general business text, with fluent output suitable for formal documents.

Disadvantages: Complex PDFs, formulas, and two-column layouts may become distorted; the free version has page-count and file-size limits.

Official website: deepl.com

4. Google Translate

A free, general-purpose translation tool that supports document upload and translation.

Features:

• Supports PDF, DOCX, PPTX, XLSX, and other file formats

• Broad language coverage

• Supports automatic language detection

Advantages: Free and easy to use, making it suitable for quickly understanding the general meaning of a document.

Disadvantages: Weak PDF layout preservation; professional terminology and complex formatting are prone to errors; access may be restricted in mainland China.

Official website: translate.google.com

5. Immersive Translate

A translation tool known for side-by-side bilingual reading, covering web pages, PDFs, video subtitles, images, and other use cases.

Features:

• Supports translation for PDF, ePub, Docx, Markdown, and subtitles

• Supports OCR for scanned PDFs

• Can export bilingual or translation-only versions

• Integrates models such as ChatGPT, DeepL, DeepSeek, and Gemini

• Provides a browser extension and desktop client

Advantages: Excellent bilingual reading experience, making it suitable for papers, technical materials, and foreign-language web pages.

Official website: immersivetranslate.com

6. Smartcat PDF Translation Agent

An AI translation agent from Smartcat for multilingual content teams that can extract text from PDFs, translate it, and reconstruct the layout.

Features:

• Supports PDF text extraction, translation, and layout reconstruction

• Supports OCR

• Can connect to multiple translation engines

• Supports human proofreading and feedback-based optimization

Advantages: Suitable for enterprise-scale, high-volume translation workflows that require brand consistency; can be combined with human review.

Official website: smartcat.com

7. Wordvice AI PDF Translation

A PDF translation tool designed for academic literature, with an emphasis on preserving formulas, charts, and two-column layouts.

Features:

• Supports automatic translation of entire PDF documents

• Provides synchronized side-by-side viewing

• Supports select-to-translate

• Can connect to tools for academic polishing, rewriting, and summarization

Advantages: Well suited to academic use cases such as papers and research reports, with strong preservation of formulas and complex layouts.

Official website: wordvice.ai

8. Kaolan Academic

A translation and reading tool for scientific literature, supporting format reflow and terminology optimization.

Features:

• Supports PDF import and side-by-side comparison of the original and translated text

• Preserves the positions of formulas, charts, and references

• Supports select-to-translate and screenshot translation

• Provides AI key-point extraction, literature management, and other features

Advantages: Suitable for in-depth reading of academic papers, with strong performance on medical, science, and engineering terminology.

Official website: scholaread.com

9. 翻译狗

An online translation platform for documents in multiple formats, supporting both automatic and human translation.

Key features:

• Supports PDFs, scanned documents, CAD drawings, tables, and more

• Provides industry-specific terminology databases for legal, medical, automotive, and other fields

• Supports custom glossaries

• Supports batch uploads

Advantages: Suitable for multi-format use cases such as foreign trade, business, and technical documents; human translation is also available.

Official website: fanyigou.com

10. UPDF

A PDF editing and reading tool with built-in AI translation, summarization, and question-answering features.

Key features:

• Supports PDF translation, annotation, and editing

• Supports OCR

• Supports AI summarization, explanations, and conversations

• Available across Windows, Mac, iOS, and Android

Advantages: Ideal for translating while annotating and editing; no need to switch between multiple applications.

Official website: updf.com