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PDF OCR 识别
将扫描的 PDF 页面转换为可编辑、可搜索的文本 — 从任何扫描文档、纯图像 PDF 或页面照片中提取文字。整个过程在您的浏览器中本地运行。
OCR 准确率取决于图像质量。为了获得最佳效果,请使用 300 DPI 或更高的清晰扫描件。手写文字和艺术字体的识别准确率可能较低。
将扫描的 PDF 拖到此处,或点击选择文件
选择 PDF 文件
最大文件大小:128 MB
所有处理在您的浏览器中本地完成。文件永远不会上传。
多语言 PDF OCR — 一次性识别混合语言
Got a PDF with English mixed with Spanish, French, German, or Chinese? Our multi-language OCR recognizes multiple scripts in a single document, producing a unified searchable PDF. No upload, no account, no daily limits — perfect for bilingual contracts, international reports, and academic papers.
100% FreeNo UploadNo Sign-upMulti-Language Engine
使用步骤
- Upload Your PDF: Drop the multi-language PDF in. Whether it's an English-Spanish legal contract, a Chinese-English academic paper, or a trilingual menu, our OCR handles mixed scripts in one pass.
- Select Languages: Pick all the languages present in your document. Common pairings like 'English + Spanish', 'English + Chinese (Simplified)', or 'English + French + German' are preconfigured. For unknown combos, select up to 4 languages manually.
- Run Multi-Language OCR: Click 'Start OCR'. Tesseract.js auto-detects script boundaries and runs the appropriate language model on each region of the page. Mixed-script pages process cleanly without manual page splitting.
- Download Searchable PDF: Save the output. It contains the original layout plus a unified text layer covering every detected script. Copy text from any paragraph — English, Spanish, Chinese characters all flow correctly to your clipboard.
为什么选择此工具
- 100% Local Processing: Files are processed entirely in your browser using JavaScript — never uploaded to any server.
- No Limits: No file count or file size restrictions. Process as many files as your device can handle.
- No Sign-up: Free forever, no account needed, no email required. Open the page and start.
- Private by Design: Nothing is sent to any server. Close the tab and your files are gone forever.
常见问题
Can OCR handle a PDF in multiple languages?
Yes. Our PDF OCR tool supports multi-language recognition in a single document. Configure the language set (e.g. 'English + Spanish') before running, and Tesseract.js will detect script boundaries and apply the right model to each text region. The output is a unified searchable PDF covering every language present.
What language combinations are supported?
We support any combination of the 100+ Tesseract.js languages, including: English + Spanish (LatAm contracts), English + Chinese Simplified (Chinese tech docs translated to English), English + French (Canadian government docs), English + Arabic (Middle East legal), Spanish + Portuguese (Latin America).
How accurate is multi-language OCR?
Accuracy is similar to single-language OCR for each script (95-98% for clean printed text). Mixed-script pages may see slightly lower accuracy at script boundaries (e.g. Chinese characters followed immediately by Latin text). Use higher scan DPI for better boundary recognition.
Will my multilingual PDF be uploaded?
No — all OCR runs in your browser via Tesseract.js WebAssembly. Whether your document is a confidential bilingual contract, proprietary academic paper, or internal corporate memo, the file never leaves your device.
How do I extract text from a Chinese-English PDF?
Open our PDF OCR tool, upload your PDF, select 'English + Chinese (Simplified)' from the language picker (or 'English + Chinese (Traditional)' for Taiwan/Hong Kong), then click 'Start OCR'. The output preserves all Chinese and English characters in a unified text layer.
Is the output searchable for Ctrl+F?
Yes — once OCR completes, open the output PDF in any reader and Ctrl+F searches the text layer. Searches match across language boundaries (e.g. you can find English words even on pages that mostly contain Chinese).