适合这些扫描场景
- Flatten a photographed ID card, receipt, form, or certificate.
- Fix perspective when a paper was captured at an angle.
- Save front and back ID images into a single PDF.
- Create a document PDF without installing a scanner app.
Document scan
带四角校正的免费文档扫描工具
拍照文件经常会歪斜或有阴影。Free PDF Forever 可以自动找边、手动拖四角、调整亮度，并保存成清晰 PDF。
No upload
No account
No watermark
No quantity limit
如何使用
- Open Images to PDF and choose the Document scan workflow.
- Add one or more document photos.
- Use auto crop and four-corner correction, then adjust brightness.
- Create a PDF with one clean scan per page.
本页覆盖的搜索意图
document scan no upload
auto crop document photo
four corner perspective correction
scan ID to PDF locally
FAQ
文档扫描常见问题
关于本地扫描、四角校正和隐私处理的简短答案。
Does it work like a scanner app?
It covers the common scanner workflow: image upload or camera capture, edge cleanup, perspective correction, brightness, and PDF export.
Is OCR included?
No. This tool focuses on making a clean PDF from document photos, not extracting text.
Why are the corner handles transparent?
The handles are designed not to cover the exact document edge while you place the four corners.
Are ID photos safe to process?
The processing happens locally in your browser, so selected images are not uploaded by the tool.