How to Convert an Image to Grayscale in 3 Easy Steps
Follow these three simple steps to convert an image to grayscale or black and white. No software installation required. Free and secure.
Choose an Image
Select a JPG, JPEG, PNG, WebP, AVIF, or BMP image from your device, or drag and drop it into the browser.
Adjust the Monochrome Effect
Choose Grayscale for continuous gray tones or Black & White for a two-tone result. Adjust intensity, contrast, threshold, or inversion while reviewing the preview.
Preview and Download
Switch between the original and processed image, choose PNG, JPG, or WebP, then download the finished image at its original pixel dimensions.
How Does the Grayscale Image Converter Work?
The CompressFly grayscale image converter uses a brightness-weighted combination of each pixel's red, green, and blue values to create a grayscale result. Grayscale mode keeps continuous shades between black and white, while Black & White mode compares each pixel with the selected threshold and converts it to pure black or pure white.
Adjust grayscale intensity and contrast, or change the black-and-white threshold and invert the two tones. The conversion runs directly in your browser, and the downloaded PNG, JPG, or WebP keeps the source image's original pixel dimensions. PNG and WebP can retain transparency, while JPG fills transparent areas with white.
What "in your browser" means
- The image file is not uploaded to a server
- Pixel processing and export run locally on your device
- The finished image is downloaded directly from your browser
Grayscale vs Black and White: What's the Difference?
Both modes remove color, but they produce different tonal results. Choose the mode based on whether the image needs smooth detail or hard two-tone separation.
| Mode | Tonal Result | Best For |
|---|---|---|
| Grayscale | Continuous shades from black through gray to white | Photos, portraits, artwork, and images that need tonal detail |
| Black & White | Only pure black and pure white pixels | Line art, stencils, simplified document images, and high-contrast graphics |
Both modes keep the source image's pixel width and height. Black & White mode removes intermediate gray tones and may lose subtle detail.
Grayscale and Black-and-White Controls
Choose the mode and tonal controls that match the result you need.
Grayscale
Set intensity to 0% to keep the original color, 100% for a complete grayscale result, or an intermediate value for partial desaturation.
Black & White
Convert pixels to pure black or white for high-contrast graphics, line art, or simplified document images.
Tone Adjustment
Control grayscale intensity and contrast, or set the black-and-white threshold and invert the two tones.
PNG, JPG, or WebP Output
Choose an output format without changing the source image's pixel width or height.
Why Use CompressFly to Convert Images to Grayscale?
Fast Browser-Based Conversion
Convert the image directly in your browser without waiting for a server upload or download.
Two Monochrome Modes
Create a continuous grayscale image or a pure black-and-white result from the same tool.
Multiple Output Formats
Export the finished grayscale or black-and-white image as PNG, JPG, or WebP.
Preview Before Downloading
Review tonal adjustments and switch between the original and processed image before downloading.
Private & Secure
Your image is processed locally in your browser and is not uploaded to a server.
Free Access
Use the grayscale image converter for free without signing up or entering credit card details.
Related Image Tools
Grayscale Image Converter FAQ
How do I convert an image to grayscale?
Convert an image to grayscale in three steps: 1. Select or drag and drop one supported image into the browser. 2. Choose Grayscale, then adjust intensity and contrast while reviewing the result. 3. Select PNG, JPG, or WebP and click “Download Image.”
What is the difference between grayscale and black and white?
A grayscale image can contain many shades between black and white. Black & White mode uses only two tones, converting each pixel to pure black or pure white according to the selected threshold.
What does the black-and-white threshold control?
The threshold determines which brightness values become black and which become white. Raising it makes more of the image black; lowering it makes more of the image white.
What does grayscale intensity control?
Grayscale intensity controls how much color is removed. At 0%, the original colors remain; at 100%, the image is fully grayscale. Intermediate values retain some of the original color.
Does converting an image to grayscale change its dimensions?
No. The downloaded image keeps the source image's original pixel width and height. Only the pixel colors are changed.
Is the grayscale image converter free?
Yes. Use the grayscale image converter for free without an account, credit card, or software installation.
Are my images uploaded to a server?
No. CompressFly processes the image directly in your browser, so the image file is not uploaded to a server.