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Straighten curved horizons and bowed walls from wide-angle and action-camera shots. This tool applies the Brown radial distortion model (k1/k2) in both directions — drag toward negative values to correct barrel/fisheye, positive to correct pincushion (or to add the effect creatively). Zoom crops the warped borders.
All processing runs locally in your browser. Your files never leave your device — no upload, no server, no signup required.
Drag k1 negative (start around -0.2) until straight lines near the edges look straight, add a little negative k2 if corners still curve, then raise Zoom slightly to crop the bent borders.
Barrel bulges lines outward (wide-angle/fisheye lenses); pincushion bends them inward (telephoto zooms). They are opposite signs of the same radial model this tool implements.
Yes — push k1 positive for a creative bulge effect. The model is symmetric, so the tool works as both a corrector and an effect generator.
No. The remap runs in WebAssembly entirely in your browser.