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Yuexian Tech
Free Online Tools
FREE Yuexian Tech Free Image Tools
Turn photos into clean scans, straight, clear, and seal-aware
Detect and flatten document corners, preserve red seals by default, and export one image or a multipage PDF.
Drop images here
or click to select multiple images
JPG · PNG · WebP · GIF · BMP supportedSCAN
Completed locally in your browser
Document Scan
Upload photographed documents, detect all four corners, correct perspective, and create scan-like images or PDFs.
Choose or drop photographed documents
Export one page as an HD image or PDF. Multiple pages are combined into one PDF in the current order.
JPG · PNG · WebP · GIF · BMP supported; select multiple files at onceAutomatic corners
Estimate paper or document edges, refine all four points, then straighten and flatten perspective.
Four scan effects
Use B&W with red seals, high-definition B&W, enhanced color, or unchanged original color.
Images and multipage PDFs
Export one page as a high-quality image or PDF, or arrange several pages into one PDF.
Free online document scanner
Straighten photographed papers and create scanner-like documents
Upload photos of contracts, IDs, receipts, or paper documents. The tool estimates all four corners locally, lets you drag each point onto the true edge, then corrects perspective, cleans the paper, and sharpens text. The default B&W + red seal mode keeps paper clean and text dark while preserving red stamps where possible. You can also choose high-definition B&W, enhanced color, or Original color to straighten the page without changing its colors. Export one page as a high-quality JPG or PDF, or arrange several scans into one multipage PDF.
Are my document photos uploaded?
No. Image reading, corner detection, perspective correction, scan enhancement, and export all happen locally in your current browser.
Will black-and-white mode remove red seals?
The default B&W + red seal effect enhances dark text and white paper while preserving red stamp regions. Choose Original color when you only want perspective correction with no color adjustment.
How are single and multiple images exported?
One page can be exported as a high-quality JPG or PDF. Multiple pages are arranged in the current order and exported as one multipage PDF.
Yuexian Tech · Support
Product and development support by Yuexian Tech
Mini-program, app, and custom software development for Zhengzhou and remote clients in Beijing, Shanghai, Hangzhou, and beyond.
China Social Insurance Calculator
Estimate employee and employer social insurance plus housing fund contributions with editable city presets.
The published period and base range appear here
After employee contributions, before IIT: ¥0.00
Contribution breakdown
Updated from the current inputsContribution bases usually change annually, while some rates vary by employer industry or temporary policy. These editable presets do not replace an authority determination.
This estimate excludes individual income tax, special deductions, supplementary medical plans, and supplementary housing funds. Follow the employer declaration, payslip, and official local system.