Relight Photo Online - Add Studio, Neon, Sunset and Product Lighting

You have a photo that looks flat, under-lit, or too plain for a thumbnail, product listing, blog post, or social graphic. Relight Photo gives you a fast way to add creative lighting without opening a heavy photo editor. Upload a photo, place soft light sources over the image, pick colors, adjust intensity, and export the result without sending the image to a server.

The tool uses Canvas blending to simulate light. Each draggable light creates a soft radial glow blended with the image, while ambient dimming and vignette controls help shape the mood. Use a warm key light for portraits, cyan and pink lights for a neon look, a large orange sunset light for outdoor edits, or a clean top light for product photos. Because every light is movable, you can quickly try top-left, side, rim, and backlight-style compositions before exporting.

Use Before / After to compare the original against the relit result, then drag the comparison divider to inspect faces, product edges, backgrounds, and color shifts. If you want to test the same lighting on another image, click Replace Photo. The new image loads locally and the current light setup remains in place, which is useful for repeated product shots, profile images, or a consistent thumbnail style.

Each light is drawn as a radial gradient with three color stops — full intensity at the center, fading through a mid stop, down to fully transparent at the edge — composited with Canvas's screen blend mode rather than a normal overlay. Screen mode can only ever brighten what's underneath, never darken it, which mirrors how real light behaves: adding a second lamp to a room never makes anything darker, and the same constraint keeps overlapping lights from producing muddy or oversaturated patches where their glows meet. Ambient dimming works the opposite way, in multiply mode with a near-black fill — multiply can only darken, so it is the correct blend for "less overall light" the same way screen is correct for "more light in one spot." The vignette control is a separate multiply pass with its own radial gradient, shaped so the center of the frame is left untouched and only the edges darken, which is what gives a relit photo the falloff of a real lens rather than a flat brightness slider. The before/after comparison isn't a CSS clip-path trick over one canvas — it renders the unlit and relit versions onto two separate offscreen canvases, then clips and draws the relit one on top of the original at exactly the divider position, so dragging the handle is really swapping in a differently-clipped second frame every time.

This is intentionally local-first. It does not require an account, cloud API, or GPU server. It also does not claim to reconstruct real scene depth like a depth-aware AI relighting system. For many web, social, blog, and product-image use cases, fast creative relighting is enough: improve a flat image, create a dramatic thumbnail, add a colored glow, test lighting direction, or prepare an image before using Image Editor for cropping and resizing or Image Compressor for final file-size reduction.