Thai OCR
สกัดข้อความภาษาไทยจากรูปภาพและเอกสารสแกน
Free · No registration for images · AI-powered
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Thai script recognition
Full support for all 44 consonants, 15 vowels, and 4 tone marks.
No word boundaries
Correctly segments Thai text which has no spaces between words.
Stacked characters
Handles vowels and tone marks above and below consonants.
Mixed Thai & English
Bilingual documents with both scripts in one pass.
Searchable PDF output
Creates PDFs with invisible text layer for full-text search.
Translate after extraction
Extract Thai text then translate to English or any language.
Why Thai OCR Is Challenging
- Thai script has no spaces between words — word boundary detection requires linguistic analysis
- Tone marks and vowel signs stack above and below consonants in multiple vertical layers
- Vowels can appear before, after, above, or below the consonant they modify
- Distinguishing similar-looking Thai characters like ก/ถ, บ/ป, พ/ฟ in small font sizes
- Processing Thai text with embedded English words and Arabic numerals without script confusion
- Handling Thai numerals (๐-๙) alongside Western digits in the same document
How to Extract Thai Text from a PDF & Images
- Go to fastocr.org
- Upload your Thai image or PDF. Language is detected automatically.
- Wait for processing — images take seconds, PDFs show a progress bar.
- Download results: searchable PDF, raw text file, or copy text directly.
Tips for Better Thai OCR Accuracy
- Use 300+ DPI scans to preserve stacked tone marks and vowel signs above/below Thai consonants
- Verify word segmentation in OCR output — Thai has no spaces so word boundaries may be incorrect
- Check for correct positioning of vowels that appear before their consonant (e.g., เ, แ, โ)
- For mixed Thai-English documents, review script boundaries to ensure clean transitions
- Use high-contrast scans to preserve the fine details of stacked diacritical marks
Common Use Cases for Thai OCR
- Digitizing Thai legal documents, contracts, and court rulings
- Extracting text from Thai government forms and official certificates
- Converting scanned Thai academic papers and university publications
- Processing Thai business invoices, tax documents, and financial records
- Archiving Thai Buddhist texts, royal decrees, and historical manuscripts
Frequently Asked Questions
How does Thai OCR handle word boundaries?
FastOCR uses AI-based word segmentation since Thai has no spaces between words. Accuracy is 94% on printed text with correct word breaks.
Does Thai OCR handle tone marks correctly?
Yes. FastOCR recognizes all four Thai tone marks and correctly positions them relative to consonants and vowels.
Can it process Thai documents with English text?
Yes. FastOCR handles mixed Thai-English documents, correctly switching between scripts within the same page.
Is Thai OCR free?
Image OCR is free with no registration. PDF processing requires a free account and includes 3 free PDFs per month.
Free for images. No registration required.