One image or a batch
Source images
JPEG, PNG, WebP
Static images. Up to 4 MiB per file, 12 MiB total and 4 million pixels per image. At most six source images.
Image Contrast
Adjust contrast using the PHP GD contrast filter.
Open this toolContrast changes the separation between light and dark tones.
Compare several regions of the picture after adjusting it, especially areas that already have strong shadows.
Inputs and controls
Contrast increase
Tool inputs
Allowed range: -100 to 100
Download format
Tool inputs
PNG, preserves alpha, JPEG, flattens alpha, WebP, server support needed
Quality
Tool inputs
Allowed range: 1 to 100
How to use
- Choose a static JPEG, PNG or WebP source. Check the displayed upload limits before processing.
- Set Contrast increase, Download format and Quality. Review the selected units and options before preparing the output.
- Select Prepare image. Inspect the resulting preview, dimensions and file size, then download the output you need.
Why use this tool
A direct setting helps you review the tonal change before saving the altered image.
Before relying on the result
Compare the finished picture with its source. Dark and bright regions can lose useful distinction, so inspect the complete result.
Questions
Can more contrast hide detail?
Yes. Dark and bright regions can lose useful distinction, so inspect the complete result.
What should I check before using Image Contrast?
Prepare a supported source image and check Contrast increase, Download format and Quality. Use the exact units shown beside the controls and replace any example values with your own inputs.
Source page last modified: 2026-10-04T18:22:34+00:00. This profile describes the tool; use its page to run it.
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