Try the new photo editor at the link below:
The new photo editor supports batch processing of images.
There will be an image processing queue. Add new filters (bottom)
To lighten the photo, load the images using the form below and set the desired brightness level. After that, click the "Download" button and download the processed images.
Also, if necessary, you can increase the contrast of the image.
Batch processing available! Light up multiple photos at once.
Image processing service