EN

Straighten a scanned PDF

Use automatic detection for text-heavy scans or set the correction angle yourself. Output pages are rasterized.

No file bytes are sent to Lutrakit.

Loading

Straighten a slightly tilted scan

Correct a small scanning tilt in a PDF, JPEG, PNG or WebP. Automatic mode estimates the angle from the page image; manual mode lets you choose the correction.

How to use it

  1. Select one PDF or image. Start with automatic mode and the default 150 DPI resolution.
  2. If the result needs adjustment, use manual mode and select an angle between −15° and +15° in 0.5° steps. Resolution choices are 72, 150 and 300 DPI.
  3. Download the new PDF and inspect text lines and page edges against the original.

Example

Starting point
A single scanned PNG processed in manual mode at +2°.
What to expect
A one-page PDF containing the rotated scan. This illustrates the chosen operation; only inspection can confirm whether +2° corrects that particular scan.

Before you start

  • The input limit is 100 MiB, with additional device-dependent limits on decoded images and pages. Sparse pages or illustrations may give poor automatic angle estimates.
  • The output is an image-based PDF, including for image input. It does not add OCR or correct photographic perspective, and existing selectable PDF text is not preserved as text.