掃描件自動糾偏
智能檢測手機拍攝或掃描版 PDF 的傾斜角度，物理糾偏並重新水平對齊，恢復完美排版。
上傳歪斜的 PDF 掃描文檔
關於此工具
PDF Deskew Aligner automatically straightens misaligned scanned pages using edge detection — ideal for pages rotated a few degrees when scanned. It rotates each page so text and table borders run level again, and optionally auto-crops the resulting edges. The detector works from line orientation, so it stays reliable even on pages with only a little text.
Archive volunteers altering newspaper scans, HR digitizing old personnel files, and tax preparers scanning client paperwork all benefit. You can let the tool decide per page or set a fixed correction, and apply it to a single file or a batch. Consistent rotation also makes merged documents look uniform instead of a patchwork of tilted sheets.
Auto-cropping removes the blank wedges that appear when a rotated page is straightened, producing clean margins for binding or screen reading. Alignment is computed in your browser, so the scans stay on your machine. Free, no account, and the output reads like a cleanly produced document instead of a hasty photo scan.
Practical guidance before you use 掃描件自動糾偏
Best for real document workflows
Use 掃描件自動糾偏 when you need a quick browser-based result without creating an account or sending routine documents through an unnecessary upload workflow. Receipt & Contract Archiving is a common example: Straighten quick hand-held mobile contract scans before saving them as formal digital PDF archives.
Privacy and file handling
EasyPDFNex prioritizes local processing in your browser. That means supported PDF operations run on your device, not in a public cloud queue. For sensitive files, review the output before sharing it, close the browser tab after downloading, and avoid processing documents you are not authorized to edit.
Quality checks after processing
After you straighten & download, open the result and check page order, text readability, signatures, links, and form fields. If the source file is scanned, encrypted, very large, or damaged, try a related workflow such as repair pdf, crop pdf, flatten pdf before repeating the task.
Start with a clean source file whenever possible. For 掃描件自動糾偏, the first step is usually "Provide skew PDF": Upload any PDF sheet carrying rotated or poorly aligned scanned documents. This simple preparation step prevents most failed exports, missing pages, and formatting surprises.
Editorial review note
This guidance is maintained by the EasyPDFNex editorial team and reviewed for practical PDF workflow accuracy. Tool pages are written to explain when a feature is useful, what to check before download, and where browser-based processing has limits.
使用方法
Provide skew PDF
Upload any PDF sheet carrying rotated or poorly aligned scanned documents.
Analyze and tweak
The engine auto-detects skew angle and draws aligning grids. Tweak angle manually if needed.
Straighten & download
Click execute to swing pages through a smooth gyroscope transition and download aligned PDF.
使用場景
Receipt & Contract Archiving
Straighten quick hand-held mobile contract scans before saving them as formal digital PDF archives.
Academic Book Digitizing
Sanitize microfilm book scans where text lines drift out of horizontal margins.
Student Homework Grading
Correct homework snapshots taken by student phones, relaxing the eyes of grading teachers.
常見問題
How is document skew detected?
We run high-speed Hough Line projections on text lines. Since formal prints have clear horizontal spacing patterns, finding the angle with the maximum variance isolates the rotation.
Will this process crop away page edges?
No. The engine calculates the rotated boundary and extends the Canvas using auto-padding, ensuring all margin text remains intact without cropping.
Does it support documents filled with diagrams?
Yes, as long as there is an underlying structure of lines or general paragraphs, our algorithms can accurately lock onto the principal reading angle.