Which file types does Contrast Adjuster accept?

The drop area takes JPG, JPEG, PNG and 9 more. Files are read from your device in the browser, so the format has to be one a browser can decode — that is why the accepted list on this page is finite and honest rather than "everything".

What do I get back from Contrast Adjuster?

The result is JPG, JPEG, PNG, WEBP, offered as a download the moment the work finishes. Multiple results come back together rather than as fifty separate save dialogs.

How big a file can I use?

Up to 100 MB per file and 50 files per batch. There is no server queue behind that limit; the practical ceiling is your browser's memory, so split unusually large documents into two runs.

Where does the processing actually happen?

In this tab. The file is read locally, converted or edited locally, and handed back as a download — no copy is sent to a server, so there is nothing for anyone to breach or keep.

Contrast Adjuster

Punch up or soften contrast.

Drag & drop your images here

or click to browse — .jpg, .jpeg, .png, .webp, .gif, .bmp, .svg, .tiff, .tif, .heic, .avif, .ico · up to 50 files

Add images first.

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About Contrast Adjuster

Contrast Adjuster is here for editing a picture one job at a time: punch up or soften contrast. It takes JPG, JPEG, PNG and 9 more and produces JPG, JPEG, PNG, WEBP. Files up to 100 MB each, 50 at a time, and the work happens on your own machine rather than on a server.

Reach for it when editing a picture one job at a time is a one-off rather than a workflow: one file, one result, no account in front of it.

How to use Contrast Adjuster in 3 steps

Drop the picture on the page — JPG, JPEG, PNG and 9 more, up to 50 at a time.
Set the Contrast slider.
Press Apply Contrast and download the result in whichever of JPG, JPEG, PNG, WEBP suits you.

What you get with Contrast Adjuster

Accepts JPG, JPEG, PNG and 9 more in one go
Output in JPG, JPEG, PNG, WEBP
Batch up to 50 files, returned together
Runs in your browser — the file is never uploaded
Free to use, with no signup and no account
No watermark or logo added to your output
Works on desktop and mobile, no install

Contrast Adjuster: questions

Which file types does Contrast Adjuster accept?: The drop area takes JPG, JPEG, PNG and 9 more. Files are read from your device in the browser, so the format has to be one a browser can decode — that is why the accepted list on this page is finite and honest rather than "everything".
What do I get back from Contrast Adjuster?: The result is JPG, JPEG, PNG, WEBP, offered as a download the moment the work finishes. Multiple results come back together rather than as fifty separate save dialogs.
How big a file can I use?: Up to 100 MB per file and 50 files per batch. There is no server queue behind that limit; the practical ceiling is your browser's memory, so split unusually large documents into two runs.
Where does the processing actually happen?: In this tab. The file is read locally, converted or edited locally, and handed back as a download — no copy is sent to a server, so there is nothing for anyone to breach or keep.