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ConvertBox

PDF OCR

Convert scanned or image-based PDFs into searchable text right in your browser. All OCR processing stays on your device for privacy.

🔍

Select a PDF file

Drop a scanned PDF here or click to choose. Up to 50MB.

Max file size: 50MB

or drag and drop · press Enter to browse

How to Use

  1. Choose your document's primary language.
  2. Optionally enable 'searchable PDF' to get a copy with selectable text.
  3. Upload the scanned PDF — processing happens entirely in your browser.
  4. Copy the extracted text or download as TXT/PDF.
  5. Verify the output file in your device's download folder.
  6. You can adjust settings and process new files immediately without any restrictions.

All processing is done in your browser, and files are never sent to a server.

Frequently Asked Questions

No. OCR runs locally in your browser via WebAssembly. Your file never leaves your device.
English, Korean, Japanese, Simplified Chinese, and Spanish. More can be added on request.
Accuracy depends on scan quality. Clear, high-DPI scans give the best results. Skewed or low-contrast images may yield errors.
OCR is CPU-intensive. The engine processes one page at a time. A 10-page PDF typically takes 30–60 seconds on a modern laptop.
No. All operations are processed entirely inside your browser's local sandbox using client-side APIs (like WebAssembly, pdf-lib, or HTML5 Canvas). Your files and data never leave your device.
The tool is completely free with no usage limits. However, since processing occurs in your browser's memory, we recommend keeping file sizes under 50MB (especially for heavy files like PDFs or videos) to ensure stability.
No. All tools on ConvertBox are 100% free. We do not insert watermarks, limit features, or require any registration or payment.
Yes. Once the page and its local library dependencies are loaded in your browser, the conversion logic runs completely offline without needing an active internet connection.

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