What file formats does the document cleaner support?

Our document cleaner supports PDF files and all common image formats including JPG, JPEG, PNG, WebP, BMP, TIFF, and TIF. You can clean both single-page images and multi-page PDF documents.

How does the smart document cleaning process work?

The tool uses smart auto-detection to analyze each page and identify issues like noise, blur, shadows, dark borders, pen marks, low contrast, skew, and soft edges. It automatically applies the appropriate cleaning operations only where needed, preserving already clean documents while enhancing poor-quality scans. No manual configuration required.

Can I remove pen marks and handwritten annotations from documents?

Yes! Our document cleaner includes intelligent pen mark removal that can detect and remove cross marks, scribbles, handwritten annotations, and unwanted lines while preserving the original printed text and document content.

Does the tool work on blurry or out-of-focus scanned documents?

Yes, the document cleaner includes advanced deblurring technology that automatically detects blur and applies Wiener deconvolution to restore sharpness. It works on motion blur, out-of-focus blur, and scanner-induced blur.

Will the tool straighten tilted or skewed scanned documents?

Yes, the auto-deskew feature automatically detects document tilt using Hough line detection and rotates the document to straighten it. This works on documents tilted up to 45 degrees.

What are the file limits for document cleaning?

The document cleaner supports files up to 25MB and PDFs up to 50 pages. For larger PDF files, use our PDF Compressor to reduce size or PDF Page Deleter to remove unnecessary pages. For large images, use our Image Compressor first. For PDFs with more than 50 pages, use our PDF Page Deleter to remove unwanted pages.

Is my document data secure and private?

Absolutely. All documents are processed securely on our servers and automatically deleted within 1 hour. We don't store, share, or access your documents. The processing is completely private and secure.

When should I use black and white mode?

Use black and white mode (binarization) for text-heavy documents to maximize clarity and reduce file size. It uses adaptive thresholding to convert the document to pure black text on white background, which is ideal for contracts, forms, and text documents.

文書クリーナー

文書からフォーマットや不要な要素をオンラインで無料削除。テキストをクリーンアップ。

文書をアップロード

ファイルをドラッグ＆ドロップ

PDFまたは画像

スマート自動検出モード

ノイズ、ぼかし、影、暗い縁、ペン跡、低コントラスト、傾き、ソフトエッジなどの問題を自動検出して修正します。クリーニングが必要なページのみ処理されます。

明るさ調整 0

暗く明るく

白黒に変換

最大の鮮明さのために、白い背景に純粋な黒いテキストに変換

文書をクリーン

ノイズを除去し品質を向上

結果をダウンロード

クリーニング済み文書がここに表示されます

オンラインで文書をクリーンする方法

Step-by-Step Process:

1
Upload Document: Select from computer or Google Drive, or drag and drop a scanned PDF or image file
2
Adjust Settings (Optional): Our smart tool automatically detects and fixes issues. You can optionally adjust brightness or convert to black & white for specific needs.
3
Download Clean Document: Get your enhanced, readable document or save back to Google Drive

Perfect For:

Photocopies: Clean up noisy photocopied documents
Scanned Documents: Enhance scanned papers and forms
Old Documents: Restore clarity to aged papers
Phone Photos: Improve document photos taken with phone

無料PDFクリーナー＆クリアスキャナー

PDF Cleaner

Our document cleaner doubles as a powerful PDF cleaner. Upload any scanned PDF and instantly remove noise, shadows, blur, and stains. Convert blurry PDF to clear PDF in seconds with our AI enhancement. Perfect for cleaning scanned receipts, contracts, IDs, academic papers, and legal documents. Supports multi-page PDFs up to 50 pages.

Clean scanned PDF documents instantly
Remove coffee stains, shadows, and dark edges
Enhance text readability in old PDFs
Process multi-page PDFs (up to 50 pages)

Clear Scanner Online

Need a clear scanner app online or a paper cleaner tool? Our tool works exactly like popular clear scanner apps but directly in your browser. Clean old paper documents, remove stains, and restore faded text. Take a photo of any document with your phone, upload it here, and get a professionally cleaned scan. No app download needed.

Works like CamScanner / Clear Scanner online
Auto-straighten tilted document photos
Remove background noise from phone camera shots
No app installation — works in any browser

よくある質問

What file formats are supported?

We support PDF files and common image formats including JPG, PNG, WebP, BMP, and TIFF.

How does smart document cleaning work?

Our smart tool automatically analyzes each page and detects issues like noise, blur, shadows, dark borders, pen marks, low contrast, skew, and soft edges. It only applies cleaning operations where needed, preserving already clean documents.

What issues does the tool automatically detect?

The smart mode detects and fixes: noise removal, deblurring, shadow removal, dark border erasure, punch hole removal, pen mark removal, contrast enhancement, auto-deskewing, and text sharpening.

When should I use black & white mode?

Use black & white mode for text-heavy documents to maximize clarity and reduce file size. It converts the document to pure black text on white background, which is ideal for contracts, forms, and text documents.

Is the original document modified?

No, your original document remains unchanged. We create a new cleaned version that you can download.

Can I use files from Google Drive?

Yes, you can select documents directly from Google Drive and save cleaned files back to Drive, either replacing originals or creating new files.

What are the file limits?

The document cleaner supports files up to 25MB and PDFs up to 50 pages. For larger files, use our PDF Compressor or Image Compressor first. For PDFs with more than 50 pages, use our PDF Page Deleter to remove unnecessary pages.

Are my documents secure?

Yes, all files are processed securely and automatically deleted after cleaning. We don't store or share your documents.

高度な文書クリーニング機能

Smart Denoising

• Advanced noise removal algorithms
• Preserves text clarity
• Adjustable strength levels
• Removes scan artifacts

Enhancement Tools

• Contrast enhancement
• Brightness adjustment
• Text sharpening
• Black & white conversion

Format Support

• PDF documents
• JPG/JPEG images
• PNG images
• WebP images
• BMP and TIFF files

文書クリーナーを使う理由

Lightning Fast Processing

Clean documents in seconds with our optimized algorithms. No waiting, instant results.

100% Secure & Private

Your documents are processed securely and deleted automatically. We never store or access your files.

AI-Powered Enhancement

Advanced computer vision algorithms automatically detect and fix blur, noise, shadows, and tilt.

Completely Free

No subscriptions, no hidden fees, no watermarks. Clean unlimited documents for free.

Works on Any Device

Use on desktop, tablet, or mobile. No software installation required, works in your browser.

Multi-Page PDF Support

Clean entire PDF documents with multiple pages. Each page is enhanced individually for best results.

Customizable Settings

Fine-tune denoise strength, brightness, contrast, and sharpening to get perfect results.

Remove Unwanted Marks

Automatically detect and remove pen marks, cross lines, scribbles, and handwritten annotations.

主なユースケース

Business Documents

Clean contracts, invoices, receipts, and business correspondence. Remove noise from photocopies and faxes.

Academic Papers

Enhance scanned research papers, textbooks, and study materials. Improve readability of old documents.

Legal Documents

Clean legal contracts, court documents, and official papers. Remove noise while preserving critical details.

Medical Records

Enhance scanned medical reports, prescriptions, and patient records for better clarity and archiving.

Historical Documents

Restore and clean old documents, manuscripts, and archives. Remove age-related noise and stains.

ID Documents

Clean scanned IDs, passports, and certificates. Improve quality for digital submissions and applications.

高度なクリーニング技術

Image Processing Algorithms:

Wiener Deconvolution: Advanced deblurring for motion and focus blur
Non-local Means Denoising: Removes noise while preserving edges
CLAHE Enhancement: Adaptive contrast enhancement for text clarity
Hough Transform: Automatic document deskewing and straightening
Morphological Operations: Shadow removal and background normalization

Smart Features:

Automatic Blur Detection: Detects and fixes blurry inputs
Intelligent Inpainting: Removes pen marks without affecting text
Adaptive Thresholding: Smart black & white conversion
Multi-scale Sharpening: Enhances text at multiple detail levels
Border Detection: Auto-crops document edges and margins