Adjust Images Online in Bulk

Batch adjust brightness, contrast, grayscale, and invert effects for JPG, PNG, and WebP images.

📖 Guide: How to adjust images online →

What can you do with this image adjuster?

Apply brightness and contrast changes to several images at once.

Create grayscale or inverted versions for quick design variants.

Keep JPG, PNG, and WebP processing local in the browser.

Download one adjusted image or package the full batch as a ZIP.

How browser image adjustment works

Add one or more images from your device.

Set brightness, contrast, grayscale, or invert options.

Render the adjusted images locally on canvas.

Download individual files or all adjusted images as a ZIP.

Why use ShotEdit to adjust images?

Useful for quick product, screenshot, and social image variants.

No upload step keeps private images on your device.

Batch settings make repeated edits faster than one-by-one tools.

Supported image formats

JPG

Common photo input and output

PNG

Lossless image input and output

WebP

Modern web image input and output

ZIP

Optional batch download package

Adjusting brightness, contrast, and colour

A photo that came out too dark, a scan that looks washed out, or a screenshot that needs to print cleanly in black and white can usually be fixed with a couple of quick adjustments. The adjuster above applies brightness, contrast, grayscale, and invert to JPG, PNG, and WebP images in your browser.

Brightness and contrast

Both sliders run from 0% to 200% and start at 100%, which leaves the image unchanged. Brightness scales every pixel up or down: 120% lifts a dim photo, 80% tones down an overexposed one. Push it too far and highlights clip to pure white, losing detail you cannot recover.

Contrast stretches or squeezes the gap between light and dark. Raising it to around 110–130% makes flat scans and foggy photos look crisper; lowering it softens harsh shadows. When a photo is both dark and flat, raise brightness first, then add contrast, and check the brightest areas as you go.

Grayscale and invert

Grayscale removes all colour and keeps the brightness of each pixel. It is useful for documents that will be printed on a black-and-white printer, for consistent-looking headshots, or simply for a classic look. Combine it with a small contrast boost to make scanned text darker and paper whiter.

Invert swaps every colour for its opposite, turning black text on white into white text on black. It helps with reading film negatives, creating dark versions of diagrams, or checking a design's contrast.

Working with batches

The same settings apply to every image in the batch, which keeps a set of product photos or document pages looking consistent. Change a slider and the batch is re-rendered with the new values, so you can compare before downloading.

Adjusted files keep their original format, get an -adjusted suffix, and can be downloaded one by one or together as a ZIP file. Images larger than about 32 megapixels are skipped to keep the browser responsive.

Starting points for common fixes

For a scan that came out grey, with dull paper and faint text, switch on Grayscale, set contrast to about 140%, and nudge brightness to 105–110% so the paper turns white; stop when thin strokes start to break up. For a screenshot that is too dark, raise brightness to 120–140% and keep an eye on white interface areas, which clip first. Remember that 0% brightness turns everything black and 0% contrast turns everything flat grey, so big jumps away from 100% rarely help. Adjust one image first and, once it looks right, add the rest: new images are processed with the settings already in place.

Before printing a dark-mode screenshot, Invert turns light text on a dark background into dark text on white and saves a lot of ink. Colours flip too, so blue links turn orange; add Grayscale if that looks odd on paper. The effects are applied in a fixed order, brightness and contrast first, then grayscale and invert, so with Invert on, raising brightness makes the final image darker rather than lighter. When a batch mixes dark and bright images, one setting will not suit both, so split them into two runs. Make these corrections before any compression, because each adjusted JPG is saved again.

Common questions

Can I undo an adjustment after downloading?

The downloaded file has the change baked in, but your original is untouched. Keep the original if you might want to try different values later.

Why do bright areas turn pure white?

Brightness above 100% pushes the lightest pixels past the maximum value, where detail is lost. Lower the brightness slightly or add contrast instead to keep the highlights.