OCR PDF – 让扫描的PDF可搜索
免费光学字符识别（OCR）将文本图像变为PDF内真实可搜索的文字。
核心OCR功能
符合工作流程的输出选项
立即导出纯文本，用于引用、字幕或翻译草稿。 生成带有隐形文本层的可搜索PDF，完整保留版式。 当你需要用于遮蔽处理或PDF/A转换的转写时，同时保存两种结果与原始排版。
自动识别正确的页面和语言
默认自动检测扫描页，让OCR只在需要的地方运行。 在拆分资料或整理长篇PDF之前，可切换为处理所有页面或输入自定义范围。 语言自动检测会选择最佳Tesseract模型；若想减小下载体积，可锁定为英语、西班牙语或德语。
面向专家的高级调校
为归档扫描精调DPI，并调整页面分割模式以适应栏位、表单或手写内容。设置最低置信度阈值、合并拆分的词元，并管理字符白名单或黑名单，以获得更干净的输出。
Why PDFJuggler wins for OCR
Compare privacy, pricing, setup, language handling, and controls in one view.
Privacy
- PDFJuggler
- Browser-based processing keeps PDFs on your device so sensitive data never leaves your desk.
- Other OCR services
- Most cloud OCR tools upload your file to remote servers before processing.
Price
- PDFJuggler
- Free OCR with no subscriptions, trials, or watermark surprises.
- Other OCR services
- Many services meter pages or lock exports behind paid tiers.
Installation
- PDFJuggler
- Runs instantly in the browser—no desktop download, no plugins, no admin approval.
- Other OCR services
- Native apps and cloud portals often require installers, sign-ups, or IT tickets.
Language handling
- PDFJuggler
- Auto-detects languages and ships tuned offline packs you can pin for consistent results.
- Other OCR services
- Limited language packs or manual toggles slow teams working across markets.
Advanced controls
- PDFJuggler
- Tune DPI, segmentation, and export both searchable PDF and plain text from one run.
- Other OCR services
- Power features and dual-output workflows usually cost extra or are missing entirely.
Follow these playbooks to prepare scans, handle languages, and deliver searchable packets without leaving your browser.
OCR PDF workflows for searchable archives and clean handoffs
Make scanned PDFs searchable before archiving
Pin languages for bilingual or global teams
Prep OCR text for editing and translation
Automate compliance-ready OCR handoffs
How to make a PDF searchable
Upload your scanned PDF. Drag and drop the scanned document or pick it from your device.
Choose the document language. Select the language so recognition matches characters accurately.
Decide which pages to process. Run OCR on every page, only pages detected as scans, or a custom page range.
Convert and download the results. Create a searchable PDF or export plain text once processing finishes.
OCR workflows: related tools and guides
Repair PDF
Fix corrupted PDFs so OCR can read every page.
Split PDF
Separate sections or remove blank scans before recognition.
Organize PDF
Reorder and rotate pages so text lines stay upright.
Compress PDF
Reduce searchable PDF size for faster sharing after OCR.
Guide: OCR scanned PDF online
Step-by-step workflow for turning scans into searchable text.
Guide: 解锁高级 PDF 工具
通过本指南全面掌握浏览器端高级 PDF 工具，涵盖定义、框架、方法、工具、常见问题解答以及可下载资源。
常见问题
什么是OCR？
OCR（光学字符识别）将文本图像转换为PDF中的可搜索、机器可读文本。
PDF外观会改变吗？
不会。我们保留原始页面内容并叠加不可见文本层，外观不变但文字可选可搜。
能在移动端使用吗？
可以，界面触控友好，可在现代移动浏览器中使用。
我的文件是私密的吗？
识别在浏览器中完成，文件不会存储在服务器。
大PDF的OCR需要多久？
速度取决于页数和语言。处理100页扫描件通常在现代笔记本上不到一分钟。
Which languages are supported?
PDF Juggler bundles offline Tesseract models for English, Spanish, German, French, and Italian. Those packs are tuned for common document types such as point-of-sale receipts, cross-border contracts, and academic PDFs so totals, clauses, and citations stay accurate.
Can I OCR mixed-language PDFs?
Yes. Keep detection on Auto and we analyze each page, download the right language pack, and balance dictionaries before recognition. For bilingual receipts toggle English + Spanish, and for dual-column contracts or research PDFs lock in the languages that appear so paragraphs stay aligned when you export text.