Grayscale Image Converter
Upload a photo or design, choose a grayscale method, preview the black-and-white result, and download PNG or JPG.
Your grayscale image will appear here
Convert color images to grayscale
Three grayscale methods
Use luminance for natural photos, average for simple tone, or lightness for balanced extremes.
Instant preview
Compare the selected black-and-white conversion before downloading.
Soukromé místní zpracování
Váš obrázek zůstane ve vašem prohlížeči. ImageConver nenahraje zdrojový soubor.
Jak to funguje
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1
Nahrajte obrázek
Choose a color image from your device.
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2
Pick a method
Select luminance, average, or lightness grayscale conversion.
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3
Stáhnout
Save the converted image as PNG or JPG.
Choosing a grayscale method
Luminance weighting usually looks best for photographs because it follows how human vision sees red, green, and blue brightness. Average grayscale treats all channels equally. Lightness uses the midpoint between the darkest and brightest channels, which can help graphic images with strong colors.
Často kladené otázky
Which grayscale method should I use?
Luminance is the best default for most photos. Average and lightness can be useful for graphics or stylized images.
Does grayscale conversion remove transparency?
No. Alpha transparency is preserved when the output format supports it.
Je můj obrázek nahrán?
No. Your image stays in your browser and grayscale conversion runs locally.
Grayscale Image Converter last reviewed: Jun 24, 2026.