The service corrects text skew and page rotation in a scanned PDF by determining orientation through line analysis. The result is a new PDF file where all pages are aligned horizontally, but they are converted into raster images, and the original text layers are not preserved.
When this is useful
First case: you photographed an important document with your phone, and it came out with a slight rotation, causing the text to be read at an angle and look untidy. Second case: you are processing a scan of a book spread where the lines of text 'swim' and curve in an arc because the page was not pressed flat against the scanner glass near the spine.
Step-by-step instructions
- Upload the PDF file containing the skewed scanned pages into the designated area.
- The tool will automatically analyze each page, determine the skew angle of the lines, and apply a corrective rotation.
- Once processing is complete, simply download the finished, straightened PDF file to your device.
How to verify the result
Verify that important fragments of text or images at the edges of the page were not cropped after straightening, as rotation often requires slight trimming. Also, ensure the text remains legible and did not become excessively blurry after the page was re-rendered into a raster format.
Important limitations
It is important to understand that the final PDF will be entirely raster-based: all original vector shapes, embedded fonts, digital signatures, and searchable text layers will be irretrievably lost. The tool is best suited for 'flat' scans and photographs, not for documents created electronically.