Japanese OCR — Image to Text & PDF

日本語OCRが難しい理由

• Recognizing three distinct writing systems (hiragana, katakana, kanji) intermixed in a single sentence
• Handling vertical text layouts (tategaki) common in novels, newspapers, and traditional documents
• Distinguishing between thousands of visually similar kanji characters with subtle stroke differences
• Processing furigana (small reading aids above kanji) without merging them into the main text line
• Correctly segmenting Japanese text which has no spaces between words

PDFや画像から日本語テキストを抽出する方法

1. Go to fastocr.org
2. 日本語の画像またはPDFをアップロードしてください。言語は自動的に検出されます。
3. 処理を待ちます — 画像は数秒、PDFは進行バーが表示されます。
4. 結果をダウンロード：検索可能なPDF、テキストファイル、またはテキストを直接コピーします。

日本語OCRの精度を上げるためのヒント

1. Specify vertical text mode if your document uses tategaki (top-to-bottom) layout
2. Use 300+ DPI scans to preserve fine stroke details that distinguish similar kanji
3. For documents with furigana, expect the small reading text to appear inline — manual cleanup may be needed
4. Crop headers and footers before processing to avoid mixing navigation text with body content
5. Review kanji carefully — visually similar characters like 土/士, 末/未, 大/犬 are common OCR errors

日本語OCRの一般的な使用例

• Digitizing Japanese business contracts and corporate filings
• Extracting text from Japanese manga and light novel scans for translation
• Converting scanned Japanese academic papers and patent documents
• Processing Japanese government forms, tax documents, and certificates
• Archiving historical Japanese texts printed in traditional vertical layout

よくある質問