Vietnamese OCR — Image to Text & PDF
Trích xuất văn bản tiếng Việt từ hình ảnh và tài liệu quét
- Tone mark recognition
- Stacked diacritics
- Latin-based script
Free image OCR. No account needed. PDFs use pages.
Open OCR for all languagesTan da, 1925
Real scan. Unedited OCR.
Dịch bài thơ thuật hoài của ông Đặng-Dung
đời nhà Trần
Việc đời man-mác, tuổi già thôi!
Đất rộng giới cao chén ngậm-ngủi.
Gặp-gỡ thời-cơ may những kẻ;
Tan-tành sự-thế luống cay ai!
Phò vua bụng những mong xoay đất,
Gột giáp sông kia khó vạch giời.
Đầu bạc giang san, thủ chứa giả,
Long-tuyền(1) mấy độ bóng giang soi.
NGUYEN-VAN
世無時事致洗國幾 Tně su ru ru nai lão hà,
事窮來去主兵讎度 Vò cùng thiên dia nhâp hàm ca.
M là E ÍT HUE** Thời lại, đồ điếu thành công dị
悠地釣雄懷路復泉 Sự khử, anh hùng âm hận đan
* Anh ước là ĐÃ ĐI TỪ Tây Trí chủ binh hữu vô hoài lộ văn phủ thiên địa-trụchà.,
E Pill IJ| HỆ TH Quốc thù vị phục, đầu tiên bạch,
何歌易多軸河白磨K dò long tuyèn dói nguyêt ma.
THẤT NGÔN CÓ PHONG TRƯỞNG THIÊN
Thăm mả cũ bên đường
Chơi lâu nhớ quê về thăm nhà,
Đường xa, người vắng, bóng chiều tà.
Một dầy lau cao, làn gió chạy,
Mấy cây thưa lá, sắc vàng pha.
(1) Long tuyền là một thanh gươm báu.Original text order preserved
Vietnamese OCR converts images, scans and PDFs containing Vietnamese (Tiếng Việt) text into editable, searchable digital text. FastOCR reads Vietnamese online: upload an image with no account, or a PDF with a free account, then copy the text or download a searchable PDF. Accuracy depends on scan quality, so check the result against your original.
Try it with your Vietnamese document
Drop your file here
PDF, PNG, JPG, WebP, BMP, HEIC
PDF up to 1 GB · images up to 20 MB
Tips for a clear photo
- Lay the page flat.
- Use even light, with no shadows.
- Turn off the flash to avoid glare.
- Fill the frame with the page.
What is Vietnamese OCR & Developer API?
Developer API docs →Vietnamese OCR is the automated process of converting scanned multi-page PDFs up to 1GB and documents into editable, searchable Vietnamese text while preserving accents, complex ligatures, and native character shapes. FastOCR reads printed text in this script and generates full-text searchable PDFs with selectable text overlays. For engineering teams building RAG pipelines, vector search databases, or automated document ingestion, FastOCR also provides a Vietnamese OCR REST API at api.fastocr.org with 20 free pages a month for every signed-in account. The API accepts PDF files up to 1 GiB, and PNG, JPG, JPEG, GIF, WebP and BMP images up to 20 MiB. An image counts as one page.
Tone mark recognition
Handles all 6 Vietnamese tone marks and diacritics accurately.
Stacked diacritics
Reads characters with multiple marks like ệ, ồ, ử correctly.
Latin-based script
Recognizes the Vietnamese alphabet with all special characters.
Document processing
Works with Vietnamese legal, academic, and business documents.
Searchable PDF output
Creates PDFs with invisible text layer for full-text search.
Translate after extraction
Extract Vietnamese text then translate to any language.
Why Vietnamese OCR Is Challenging
- Recognizing stacked diacritics where tone marks appear above or below vowels that already have accent marks
- Handling six tone marks (sắc, huyền, hỏi, ngã, nặng) that are critical for meaning in Vietnamese
- Preserving the đ/Đ character (d with stroke) distinct from regular d/D
- Processing the full Vietnamese vowel set with diacritics: ă, â, ê, ô, ơ, ư and their toned variants
- Correctly rendering double-stacked marks like ầ, ẩ, ẫ, ậ where circumflex and tone mark combine
How to Extract Vietnamese Text from a PDF & Images
- Go to fastocr.org
- Upload your Vietnamese 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 Vietnamese OCR Accuracy
- Scan at 300+ DPI — Vietnamese diacritics are small and easily lost in low-resolution images
- Verify tone marks after OCR — missing or wrong tones completely change word meaning in Vietnamese
- Check the đ character is preserved and not converted to a plain d
- For stacked diacritics (e.g., ầ, ổ, ữ), zoom in to verify both marks are correctly recognized
- Use clean, high-contrast scans to preserve the fine details of Vietnamese diacritical marks
Common Use Cases for Vietnamese OCR
- Digitizing Vietnamese legal documents, contracts, and notarial records
- Extracting text from Vietnamese government forms and identity documents
- Converting scanned Vietnamese academic papers and educational materials
- Processing Vietnamese business invoices and import/export documentation
- Archiving Vietnamese newspaper articles and literary publications
FastOCR vs Standard OCR Apps for Vietnamese
| Capability | FastOCR Dedicated Cloud AI | Standard Online OCR Tools |
|---|---|---|
| Vietnamese Script Recognition | ✅ Full native cloud recognition for Vietnamese (complex alphabets and diacritics) | Limited character sets or unhandled accents |
| Multi-Column & Table Layouts | ✅ Preserves proper paragraph and table alignment | Merges unrelated columns together |
| Searchable PDF Output | ✅ Dual-layer searchable PDF with coordinate-aligned text overlay | Plain unformatted text dump only or unsupported |
| Instant Web Access | ✅ Zero software installation (runs in mobile & desktop browser) | Requires local CLI libraries or complex desktop setup |
Frequently Asked Questions
Does Vietnamese OCR handle tone marks correctly?
Yes. FastOCR recognizes all six Vietnamese tone marks and stacked diacritics.
Can it handle the đ character?
Yes. FastOCR correctly distinguishes đ (d with stroke) from regular d, which is essential for Vietnamese text.
How accurate is Vietnamese OCR?
FastOCR reads printed Vietnamese. Stacked diacritics on small text may occasionally be misread.
Is Vietnamese OCR free?
Image OCR is free with no registration. PDF processing requires a free account — see fastocr.org/pricing for plan details.
Dedicated Vietnamese Tools
PDF to Text
Convert and extract Vietnamese documents.
Image to Text
Convert and extract Vietnamese documents.
Handwriting OCR
Convert and extract Vietnamese documents.
Searchable PDF
Convert and extract Vietnamese documents.
Vietnamese to English Translation
Convert and extract Vietnamese documents.
English to Vietnamese Translation
Convert and extract Vietnamese documents.
All supported languages
Convert and extract Vietnamese documents.
Explore Specialized OCR Workflows
FastOCR provides dedicated AI text recognition engines optimized for complex document types and formats:
Free for images. No registration required.
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Upload & Extract TextLast updated: July 24, 2026