Scan to Unicode
Convert scanned Bangla documents to editable Unicode text.
How to Convert a Scanned Document to Unicode
- 1
Upload scan
Select a scanned document image (PNG, JPG, or other image format).
- 2
Wait for OCR
Tesseract.js recognizes Bangla text from the scan with a progress indicator.
- 3
Auto-convert
If enabled (default), recognized text is auto-converted to clean Unicode. Toggle off for raw OCR.
- 4
Copy or download
Copy the Unicode text or download it as a .txt file.
- 1
Upload scan
Select a scanned document image (PNG, JPG, or other image format).
- 2
Wait for OCR
Tesseract.js recognizes Bangla text from the scan with a progress indicator.
- 3
Auto-convert
If enabled (default), recognized text is auto-converted to clean Unicode. Toggle off for raw OCR.
- 4
Copy or download
Copy the Unicode text or download it as a .txt file.
Scan to Unicode Features
When You Need Scan to Unicode
Old Book Digitization
Convert scanned pages of old Bangla books and literature into editable Unicode text for digital archives.
Government Forms
Extract text from scanned government forms, certificates, and official documents for digital record-keeping.
Academic Papers
Convert scanned Bangla research papers and journal articles into searchable, editable text.
Historical Documents
Digitize scanned historical Bangla documents and manuscripts as Unicode text for preservation and study.
Understanding Scan to Unicode Conversion
This tool combines two steps: OCR recognition and encoding conversion. First, Tesseract.js analyzes the scanned image and recognizes the Bangla text character by character. Then, if auto-convert is enabled, the recognized text is passed through an encoding detector that identifies whether the text is Bijoy, ANSI, or another legacy format, and converts it to clean Unicode.
Scanned documents often contain text printed in Bijoy fonts (like SutonnyMJ). When OCR recognizes this text, it may output the raw byte values rather than proper Unicode. The auto-conversion step maps these bytes to their Unicode equivalents, producing editable Bangla text that works in any modern application. If the scan already contains Unicode text, you can disable auto-convert and use only the OCR step.
Common Scan Conversion Problems & Fixes
| Problem | Cause | Fix |
|---|---|---|
| Converted text contains many errors | The scan quality is low — blurry, skewed, or has poor contrast. OCR struggles with degraded scans. | Use a higher-resolution scan with even lighting and clear text. Straighten skewed scans before uploading. Proofread the output and correct errors manually. |
| Auto-conversion produces wrong characters | The OCR output may contain recognition errors that confuse the encoding detector, or the scan contains mixed encodings. | Disable auto-convert to see the raw OCR output, then manually convert it using our Bijoy to Unicode or ANSI to Unicode tools for more control. |
| OCR takes too long on large scans | Large images require more processing time and memory for the Tesseract.js engine. | Resize the image to around 1500-2000 pixels wide before uploading. Crop to focus on the text area. Close other browser tabs to free up memory. |
| Bangla numbers are not recognized correctly | Tesseract may confuse Bangla digits (০-৯) with similar-looking English digits or punctuation. | Use a higher-resolution scan with clearer digit rendering. After OCR, manually verify and correct any misrecognized numbers in the output text. |
Frequently Asked Questions
How does scan to Unicode work?
The tool uses OCR to recognize text from scanned document images, then optionally auto-converts the recognized text to Unicode format. This combines text recognition and encoding conversion in one step.
What if the scan quality is poor?
OCR accuracy depends on image quality. Try to use high-resolution scans with good lighting and contrast for best results. If the scan is blurry or skewed, the recognized text will contain more errors that need manual proofreading.
Can I disable auto-conversion?
Yes. The auto-convert to Unicode toggle can be turned off if you want to see the raw OCR output without encoding conversion. This is useful if the scanned document already contains Unicode text and you only need OCR recognition.
What is the difference between Scan to Unicode and Bangla OCR?
Both use the same Tesseract.js OCR engine. Scan to Unicode adds an automatic encoding conversion step after OCR, so the output is clean Unicode Bangla even if the scan contains Bijoy or ANSI-encoded text. Bangla OCR outputs raw recognized text without encoding conversion.
Can I scan multiple pages?
Currently, the tool processes one image at a time. For multi-page documents, scan each page separately and combine the text manually, or use our PDF to Unicode tool if the pages are combined into a single PDF.
Is my scanned document uploaded to a server?
No. All OCR and conversion processing happens in your browser using Tesseract.js. Your scanned documents never leave your device, making this tool safe for sensitive or confidential paperwork.
Is this Scan to Unicode tool free?
Yes, completely free. No registration, no daily limit, no scan count cap. All OCR and conversion happens in your browser — there is no server-side processing. You can use it unlimited times for personal, educational, or commercial work.
What image formats are supported?
All common image formats are supported: PNG, JPG, JPEG, GIF, BMP, and WebP. For best OCR results, use PNG or high-quality JPG with at least 300 DPI resolution, dark text on a light background, and minimal skew.