Equalize Image
Automatically maximize contrast by stretching the tonal range to cover the full 0–255 spectrum. One click, no sliders, entirely in your browser — free, private, and instant.
Upload an image
Drop image here
or click to browse
Options
Automatic contrast spread
Histogram equalization remaps pixel values so the tonal distribution is as flat as possible, revealing detail in flat or washed-out areas.
100% private
Your image is processed entirely in your browser using the Canvas API — nothing is ever uploaded to a server.
Free and unlimited
No signup, no watermark, no daily limit. Process as many images as you like.
How to equalize an image
Upload your image
Drag and drop or click to select a JPG, PNG, or WebP image.
Equalize
The tonal range is automatically spread across the full 0–255 spectrum in the live preview — no sliders needed.
Pick a format
Choose PNG to keep transparency or JPG for the smallest file size.
Download
Click download to save the equalized image to your device.
Frequently asked questions
What does histogram equalization do?
It counts how often each brightness level appears, builds a cumulative distribution, then remaps pixel values so the distribution is as flat as possible — spreading tones that were bunched together into the full 0–255 range.
Is the equalize tool free?
Yes — completely free and unlimited. No signup, no account, no watermark, no daily limit.
Are my files uploaded to a server?
No. The equalization happens entirely in your browser on your device. Your image never leaves your computer, so it stays fully private.
When should I use equalize instead of contrast?
Use equalize when an image looks flat or washed out and you want a one-click automatic fix. Use the contrast slider when you want precise, manual control over how much contrast to add.
Equalize another image
Drop in a new photo to auto-enhance its contrast — free and unlimited, no signup required.
Choose The Right Tool
Why this page exists
Use equalize to automatically spread the tonal range of a photo for maximum contrast — one click, no sliders, entirely in your browser.
Best for
- Flat, low-contrast, or foggy photos with a narrow tonal range
- Scanned documents or photos where detail is washed out
- A fast, automatic contrast fix without manual adjustments