Image Brightener
Adjust brightness, contrast, gamma, and saturation of your images online for free. Lighten dark photos, enhance colors, and fix exposure issues instantly.
Allowed Filetypes: All image formats (JPG, PNG, TIFF, RAW, etc.)
How to brighten images online
- 1Upload your images by clicking the upload area or dragging and dropping files
- 2Adjust the brightness, contrast, gamma, and saturation sliders
- 3Preview the adjusted result in real-time
- 4Choose your preferred output format
- 5Download individual images or all at once as a ZIP file
Frequently Asked Questions
What does each adjustment slider do?
Brightness adjusts the overall lightness or darkness of the image. Contrast controls the difference between light and dark areas. Gamma affects the midtones and is useful for correcting exposure. Saturation controls the intensity of colors.
How do I fix a dark underexposed photo?
Start by increasing the brightness slider. Then adjust gamma to bring out details in the shadows. If the image looks washed out, increase contrast slightly. Finally, adjust saturation if colors look dull.
Does this tool support animated images?
Yes! This tool fully supports animated GIFs, animated WebP, and APNG files. All frames in the animation will be adjusted while preserving the animation timing and quality.
What image formats are supported?
You can adjust images in AVIF, Animated PNG (APNG), BMP, GIF, HEIC/HEIF, ICO (Icon), JPE, JPG, JPG (JPEG), MP4 (Video), PBM, PGM, PNG, PNG 24-bit, PNG 32-bit, PNG 8-bit, PNM, PPM, PSD, RAW formats (CR2, CR3, NEF, ARW, DNG, ORF, RAF, etc.), SVG, TGA (Targa), TIFF, WebP, XCF. Output formats include AVIF, BMP, GIF, JPG (JPEG), PNG, SVG, TIFF, WebP.
Are my photos safe?
Absolutely! All processing happens locally in your browser using WebAssembly technology. Your images are never uploaded to any server - they stay completely private on your device.
Can I adjust multiple images at once?
Yes! Upload multiple images, preview the adjusted results, and download them all individually or as a ZIP file. The same adjustments are applied to all images simultaneously.
What is the difference between brightness and gamma?
Brightness adjusts all pixels equally, making the entire image lighter or darker. Gamma correction affects midtones more than highlights and shadows, which is better for correcting exposure issues without losing detail in bright or dark areas.
Is there a file size or quantity limit?
No, there are no file size or quantity restrictions. All processing happens locally in your browser, so larger files or batches may take longer depending on your device's performance.
I have another question
We are always happy to get feedback to expand the tool or clarify things.