Create a luminosity mask

  1. Choose File
  2. Options
  3. Result

Your image stays in this browser. No upload or paid API is used.

JPEG, PNG or WebP; up to 20 MB, 12 megapixels and 8192 pixels per side. Animated files use only the first frame. Export is an 8-bit browser-rendered image, without original metadata or a preserved print color profile.

How to use this tool

Select a brightness range as a grayscale mask or transparency.

  1. Choose the source image. Check its dimensions and the original preview.
  2. Set the minimum and maximum brightness and soften the tonal boundaries. Choose a mask or transparent cutout, then apply.
  3. Press Process image. Compare the result with the original, choose PNG, JPEG or WebP, then download the result. Changing a setting clears the previous result.

White in the grayscale mask means selected visible pixels; black means excluded. The mask is an opaque image, while transparency output retains source colors.

How to use this tool →

Supported formats

This tool accepts these formats. Uncommon containers and modern web formats may be normalized or converted on the server before processing.

Images
APNG AVIF BMP DDS DPX EXR FITS FTS GIF HDR HEIC HEIF ICO J2C J2K JPC JPE JPEG JPG JP2 JPF JPM JPS JXL MJ2 PAM PBM PCX PDN PGM PNG PNM PPM PSD TGA TIF TIFF WBMP WEBP SVG

A damaged file or a non-standard codec can still fail even when the extension is supported.

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