Merge 3 Exposures into HDR Online — Free HDR Photo Stitcher
Upload three bracketed exposure photos and this free online HDR stitcher fuses them into a single, naturally exposed high dynamic range image — no software to install and no account needed.
What is HDR photography?
HDR stands for High Dynamic Range. A standard photograph can only capture a limited range of brightness in one shot — either the highlights blow out or the shadows lose detail. HDR photography solves this by combining multiple exposures of the same scene taken at different shutter speeds (a technique called exposure bracketing). The brightest exposure preserves shadow detail, the darkest retains highlight information, and the middle exposure captures the mid-tones. By merging all three, the final image reflects the full tonal range that the human eye naturally perceives.
The result is an image with realistic, well-balanced lighting rather than the exaggerated, over-saturated look often associated with early HDR processing. This tool is specifically designed to produce natural-looking HDR output rather than the heavily tone-mapped style popular in the late 2000s.
When should you use HDR merging?
- Interior architecture: Rooms where bright windows and dark corners appear in the same frame are classic HDR candidates.
- Landscape photography: Bright skies against darker foregrounds benefit greatly from HDR fusion.
- Real estate photography: Balanced indoor/outdoor light improves property images significantly.
- High-contrast scenes: Any situation where a single exposure cannot hold both highlight and shadow detail.
Note that this tool limits input resolution to 2048 pixels and accepts exactly 3 input images. For scenes requiring higher resolution or custom tone-mapping parameters, the dedicated HDR Photo tool on this site supports those advanced options.
Tips for best results
For the sharpest HDR merge, shoot all three exposures from a tripod to avoid alignment issues between frames. Use your camera’s auto exposure bracketing (AEB) mode — typically spaced 1–2 EV stops apart — so the exposures overlap in tonal coverage. JPEG and common RAW-derived formats are supported as input. Make sure all three images show the same scene from the same angle; moving subjects such as people or branches can cause ghosting artefacts in the merged output.
Frequently asked questions
Is this HDR merger tool free to use?
Yes, the tool is completely free. No account or subscription is required to merge your photos.
What image formats can I upload?
The tool accepts common web and camera image formats including JPEG and PNG. All three uploaded files must be photos of the same scene taken at different exposure levels.
What happens to my photos after processing?
Uploaded images are processed on the server to generate the HDR result and are then deleted automatically. They are not stored, shared, or used for any other purpose.
Why is there a 2048-pixel resolution limit?
The 2048-pixel cap keeps processing fast and free for all users. If you need full-resolution HDR merging or custom tone-mapping parameters, the HDR Photo tool on this site does not have this restriction.
Do I need to use exactly 3 images?
Yes, this tool requires exactly 3 differently exposed images — typically an under-exposed, a correctly exposed, and an over-exposed shot of the same scene. For workflows requiring more input frames, consider the site’s advanced HDR Photo tool.