Why Straighten Images?
Straightening creates professional and properly aligned photos. Tilted images can be distracting and reduce visual quality.
Benefits of Image Straightening
- Professional Appearance: Create properly aligned, level images.
- Automatic Detection: Auto-detect rotation angle using edge detection.
- Manual Control: Fine-tune the rotation angle manually.
- Document Quality: Straighten scanned documents for readability.
- Quick Fix: Instantly correct tilted photos and images.
How Image Straightening Works
The tool detects dominant lines and estimates rotation angle, then rotates the image to align horizontal and vertical structures.
Straightening Process
- Edge Detection: Finds strong edges and candidate lines in the image.
- Angle Calculation: Computes the correction angle from detected line orientation.
- Rotation Transformation: Applies rotation to straighten the image.
- Interpolation: Interpolates pixel values to preserve quality.
- Output Generation: Produces a straightened image for export.
Common Use Cases
Useful for landscape photography, documents, and architecture.
Landscape Photography
Straighten horizon lines in outdoor scenes.
Scanned Documents
Fix pages captured at slight angles.
Architectural Photography
Improve alignment in building photos.
Powered by browser APIs and client-side generation.
Frequently Asked Questions
How does auto-straightening work?
It analyzes edges and dominant lines to estimate and apply a correction angle.
What if auto-detection doesn't work?
Switch to manual mode and fine-tune the angle with the slider.
Can I straighten any image?
Yes, but auto mode works best when clear lines are visible.
Will straightening affect image quality?
A minor interpolation loss is possible, usually minimal.
What's the difference between straightening and perspective correction?
Straightening fixes rotation; perspective correction fixes camera-angle distortion.
Can I straighten scanned documents?
Yes, this is one of the best use cases.
Is my image data secure?
Yes. Processing happens locally in your browser.