Sharpen images using standard convolution kernel or Unsharp Mask — the same technique used by professional image editors. Control strength and radius with sliders, compare before/after, and process multiple images in bulk with ZIP download.
Drag and drop one or more images that need sharpening — slightly soft photos, images resized from large to small, scanned documents, or images that lost crispness from compression or processing.
Standard mode applies a convolution sharpening kernel — fast and good for subtle enhancement. Unsharp Mask mode (more precise) creates a blurred version of the image and subtracts it, revealing edge contrast. Adjust the Strength slider (how intense) and Radius (how wide the sharpening halo is). The live preview updates instantly.
Use the Before/After comparison slider to verify the sharpening effect. Watch for halos around strong edges — if visible, reduce strength or radius. Download as JPG, PNG, or WebP. Bulk mode packages all sharpened images into a ZIP.
Despite its confusing name (it comes from a traditional darkroom technique), Unsharp Mask is the most controlled sharpening method available. It works by creating a blurred (unsharp) version of the image, subtracting it from the original to isolate edges, then adding that edge information back at a controlled strength. This gives you independent control over sharpening radius (how wide the effect is) and strength (how intense), making it far more precise than a simple sharpen kernel.
Use Standard mode for quick, subtle sharpening of slightly soft images — it applies a fixed convolution kernel that works well for general photo enhancement. Use Unsharp Mask for more precise control, particularly when sharpening images for print, working on portraits (where over-sharpening skin looks bad), or when you need to sharpen fine detail without affecting flat areas.
Sharpening halos are bright or dark rings that appear around high-contrast edges when the sharpening effect is too strong or the radius is too large. They are the primary sign of over-sharpening. To avoid them: use the lowest strength that gives a visible improvement, keep the radius moderate (1–2px for web images, slightly higher for large prints), and always check the Before/After preview zoomed in on the sharpest parts of the image.
Sharpening enhances existing edges — it cannot recover detail that was never captured. A blurry photo (from camera shake or missed focus) does not contain the edge information needed for sharpening to work. Sharpening such a photo will increase contrast around the blurry edges but will not make them actually sharp. This tool is best for images that are "slightly soft" — images that contain the detail but need it brought out.
The professional order is: denoise first, then adjust brightness and contrast, then sharpen last. Sharpening before denoising amplifies noise. Sharpening after brightness/contrast means you are sharpening the final tonal values, not intermediate ones. Always sharpen as the last step in your editing workflow.
Yes — bulk mode applies the same sharpening mode, strength, and radius to all uploaded images, then packages them into a ZIP download. This is useful for sharpening a batch of images that were softened by resizing for web upload, or applying consistent sharpening to a product image library.
