Online Tool Store
Photo Perspective Corrector
Upload a photo and correct converging vertical or horizontal lines with two sliders, then download the straightened result as a PNG.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
-8°
2°
Preview
How it works
- Upload a photo with converging vertical or horizontal lines — a building shot from below, or a document photographed at an angle.
- Drag the vertical and horizontal correction sliders until the lines look straight.
- Download the corrected image as a PNG.
Each slider computes a full projective (homography) warp from the correction angle, then resamples every pixel of the uploaded photo into the straightened result — the same class of transform dedicated perspective-correction tools use, not a simple shear.
FAQ
Is my photo uploaded anywhere?
No. Photo Perspective Corrector runs entirely in your browser — the image is decoded, warped, and rendered locally, and nothing is sent to a server.
What kind of correction does this apply?
A true projective (perspective) correction, not a simple skew — the vertical slider straightens lines that converge left-to-right (like a building shot from an angle), and the horizontal slider straightens lines that converge top-to-bottom.
Does correcting the perspective crop my photo?
The corrected image keeps the same pixel dimensions as the original; areas the warp pulls in from outside the original frame are left transparent rather than cropped or stretched.
Can I use this on mobile?
Yes — it works in any modern mobile browser, though very large photos are scaled down first to keep the correction responsive.
How we compare
| Feature | Online Tool Store | Manual work | Paid software |
|---|---|---|---|
| No file upload to a server | ✓ | N/A | Runs locally after install |
| Free, no sign-up | ✓ | ✓ | Often subscription-based |
| Manual corner/point-based warp control | ✗ | N/A | ✓ |
Two sliders cover the common case — a building or document shot at an angle — without opening a full photo editor. For fine-grained corner-by-corner control on a complex shot, dedicated editing software goes further.