Free Online Image Editor
Adjust image brightness and contrast
This is a free image editor that runs in your web browser.
It allows you to edit images easily on a PC or smartphone without installing anything.
With this app, you can adjust the brightness and contrast of your images and photos with a simple operation.

Instructions for Use

First, click "Open Image File" in the main menu to load an image file.
Open Image File
You can also open a file by dropping the image directly onto the canvas.
Drop Image File

How to adjust the brightness and contrast of an image

When the image is finished loading, set how you would like to adjust the brightness and contrast.
After setting the brightness and contrast, press the Apply button to perform the adjustment.

Settings

>Adjust image brightness and contrast
Brightness
Sets the change in brightness value of the image in the range of -100 to 100.
Increasing the value will make all colors in the image lighter, reducing the value will make all colors in the image darker.
If the value is 0, the brightness of the image will not be changed.
Contrast
Sets the change in contrast value of the image in the range of -100 to 100.
Increasing the value will make all colors in the image more intense, reducing the value will make all colors in the image more faint.
If the value is 0, the contrast of the image will not be changed.
[ Example ]
Original image
Original image
brightness + 30 image
Set the brightness to +30, made the colors in the image lighter
brightness - 30 image
Set the brightness to -30, made the colors in the image darker
contrast - 100 image
Set the contrast to -100, made the colors in the image fainter

Saving Images

When you finish editing, save your image.
Please save the image that is displayed on the canvas directly from the menu of your web browser.
save image as
You can also save your work using "Save Image" in the main menu, but this may not function in some browsers.
save image

Handling of images

This app performs the image processing on the user's device, and does not transmit any imported images externally.
Accordingly, there is no worry of the content of the image being recorded on servers, nor of any leakage to outside parties.