Online Batch Image Exposure Adjustment Tool
Adjust exposure for up to 30 images with one RGB multiplier. Set -100% to 100%, generate previews and download separate PNGs in your browser.
Start using
What Online Batch Image Exposure Adjustment Tool actually does
Batch exposure adjustment accepts up to 30 selected images and applies one shared Adjustment strength to every loaded image. The numeric control ranges from -100% to 100% and defaults to 25%; there are no per-image settings, automatic exposure analysis or live preview.
Checkable example
Verified example for RGB(50,100,150): +50% gives RGB(100,200,255), -50% gives RGB(25,50,75), +100% gives RGB(200,255,255), and -100% gives approximately RGB(12,25,38) after byte rounding. Alpha and dimensions are unchanged.
Controls, output and limits
Each red, green and blue byte is multiplied by 2^(2*strength/100), with strength clamped to -100 through 100. Thus -100% is a factor of 0.25, -50% is 0.5, 0% is 1, +50% is 2 and +100% is 4; output bytes are clamped to 0-255.
This is a direct gamma-encoded RGB multiplier. Positive values can clip bright channels to 255 and cannot recover highlight detail; negative values compress channels toward black. It does not work in linear-light scene exposure, inspect a histogram, alter white balance or selectively protect highlights and shadows.
Each input must have an image MIME type, be at most 25 MB and decode to no more than 24,000,000 pixels. The selected batch is capped at 100 MB and 40,000,000 decoded pixels; selecting more than 30 files rejects the whole batch.
Generate creates one browser preview per loaded image. Every result is encoded as PNG and named from the source base name plus -exposure.png. Download all starts separate downloads about 180 ms apart; it does not create a ZIP or preserve the source format or metadata.
Processing is local in the browser. Use small adjustments first and compare every preview because one shared multiplier can suit one photograph but clip or darken another. This tool is not RAW development, HDR recovery, AI relighting or camera exposure correction; retain the originals.
The calculation clamps strength to -100–100 without rewriting the field; clearing the field uses 0, not the initial 25. Fractions are allowed.
Every Generate recalculates from the currently uploaded source, rather than adding another adjustment to the previous preview. Set the value to 0 and generate to restore the decoded source RGB. If you upload an already clipped export as the new source, its lost detail cannot be recovered by reversing the signs.
Per image: ≤25 MiB and ≤24,000,000 pixels. Per batch: ≤100 MiB and ≤40,000,000 pixels. Selecting over 30 files or any invalid image rejects the whole batch.
Processing takes place locally in your browser.