PDFに無料でオンラインでOCRを実行する方法
クイックアンサー:
easytools24のOCRツールで無料でオンラインでPDFにOCRを適用できます。スキャンPDFをアップロードするとツールがすべての認識可能テキストを抽出し、コピー・検索可能にします。すべてブラウザ内で処理されます。
準備はいいですか テキスト抽出(ocr)? 無料ツールをお使いください テキスト抽出(OCR) — アップロード不要。
テキスト抽出(OCR) を無料で試す →登録不要 · 透かしなし · ファイルはお使いのデバイスに保存されます
What Is PDF OCR?
PDF OCR applies Optical Character Recognition to PDF documents that contain scanned images rather than selectable text. Many PDFs — especially scanned documents, old records, and faxed papers — are essentially image files packaged as PDFs.
OCR reads the text visible in these scanned pages and converts it to actual text data. After OCR processing, you can copy, search, and edit the text that was previously locked in an image.
Why Use OCR on PDFs?
Scanned PDFs without OCR are limited and frustrating:
1. Extract Text for Editing
Scanned PDFs do not allow text selection. OCR extracts the text so you can copy it into Word documents, spreadsheets, or other editable formats.
2. Make Documents Searchable
Without OCR, you cannot search a scanned PDF for specific words or phrases. OCR converts the image text to searchable content, making it easy to find information.
3. Archive Old Documents
Organizations scan paper archives into PDFs for digital storage. OCR ensures these scanned documents are searchable and their content is accessible for future reference.
4. Process Forms and Records
Scanned forms, invoices, and records need OCR to extract structured data. The extracted text can be entered into databases, accounting systems, or CRM tools.
How to OCR a PDF — Step-by-Step Guide
Extract text from your scanned PDF:
Step 1: Open the OCR Tool
Navigate to the Extract Text (OCR) tool in any browser. No software installation or account required.
Step 2: Load Your Scanned PDF
Drag and drop your scanned PDF into the tool. The PDF is rendered in your browser and never uploaded to any server.
Step 3: Run OCR Processing
The tool analyzes each page of the PDF using tesseract.js OCR. It identifies and extracts all readable text from the scanned document images.
Step 4: Copy or Download the Text
Review the extracted text in the output area. Copy it to your clipboard for pasting into other applications, or download it as a text file.
Tips for Better PDF OCR Results
Scan at High Resolution
When scanning paper documents, use 300 DPI or higher. Higher resolution scans produce dramatically better OCR results compared to 100 or 150 DPI scans.
Ensure Clean Scans
Crooked pages, shadows, and stains reduce OCR accuracy. Straighten the document and ensure even lighting when scanning for the best text recognition results.
Check Results Carefully
OCR is highly accurate but not perfect. Always proofread the extracted text, especially for numbers, proper names, and unusual formatting that OCR may misinterpret.
Common Use Cases
PDF OCR is essential for:
- Legal professionals extracting text from scanned contracts and court filings
- Accountants processing scanned invoices and financial records
- Researchers extracting data from scanned academic papers
- HR departments digitizing scanned employee records and applications
- Government offices converting paper archives to searchable digital records
- Students extracting text from scanned textbook pages for notes
よくある質問
Can I OCR a scanned PDF for free?+
How accurate is PDF OCR?+
Is my scanned PDF kept private?+
What languages does PDF OCR support?+
関連ガイド
画像から無料でオンラインでテキストを抽出する方法 — OCR
OCR技術で画像から無料でオンラインでテキストを抽出。ファイルアップロード不要。
ガイドを読む →PDFから無料でテキストを抽出する方法 — スキャンPDFのOCR
PDFから無料でテキストを抽出。OCRを使ってブラウザ内でスキャンPDFを編集可能なテキストに変換。
ガイドを読む →PDFを無料でオンライン圧縮する方法 — ファイルアップロード不要
サーバーにファイルを送信せずにPDFを無料でオンライン圧縮。すべての処理はブラウザ内で完了。登録不要、即時ダウンロード。
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