Focus and Sharpness Meter

Analyze image focus quality and sharpness metrics for photographers, designers, and content creators. Runs entirely offline in your browser.

Drop image or click to upload

Analysis Region

Sharpness Algorithm

Show sharpness heatmap

Upload an image to analyze focus and sharpness

Analysis Results

Sharpness Score

Focus Status

Variance

Peak Frequency

Understanding Image Sharpness and Focus

Sharpness measurement helps photographers and designers evaluate image quality, detect focus issues, and optimize capture settings. Proper focus ensures your images convey the intended clarity and detail.

How to Use This Tool

Upload any image (JPEG, PNG, WebP supported)
Select analysis region and algorithm
Click "Analyze Sharpness" to get metrics
Toggle heatmap to visualize sharpness distribution

Practical Examples

Use Case	Target Score	Notes
Portrait Photography	800-1200	Eye area should be sharpest
Landscape Photography	1500-2500	Entire frame should be consistent
Product Photography	2000-3500	Critical for e-commerce and details

Sharpness Reference Values

Score Range	Focus Quality	Recommended Action
0-500	Very Soft	Retake with better focus
500-1000	Acceptable	Good for web use
1000-2000	Sharp	Ideal for most purposes
2000+	Very Sharp	Excellent for print/details

Sharpness Comparison Tool

Upload Reference Image

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Comparison Results

Current Image: --

Reference Image: --

Difference: --

Frequently Asked Questions

Which browsers support this tool?

All modern browsers with Canvas support (Chrome, Firefox, Safari, Edge). File processing happens entirely offline.

How accurate are the sharpness measurements?

Accuracy depends on image content and algorithm. Laplacian variance works well for general photography while FFT analysis provides frequency domain insights.

Does this tool handle RAW images?

Browser limitations prevent RAW processing. Convert to JPEG, PNG, or WebP first for analysis.

Can I analyze very large images?

Large images are automatically downscaled for analysis to ensure performance. Full resolution processing is available on export.

Formulas and Assumptions

Laplacian Variance: σ² = Σ(I(x,y) - μ)² / (n-1) where I is Laplacian response

Sobel Gradient: G = √(Gx² + Gy²), Score = mean(G) × 1000

FFT Analysis: High-frequency energy in Fourier domain indicates sharpness

Rounding: Scores rounded to nearest integer, variances to 2 decimal places

For informational and educational purposes only. All processing runs locally in your browser. Color management, codecs, and performance depend on your device. Verify critical work with professional tools.

WHATWG HTML Canvas and File APIs | W3C Canvas 2D Context specification | JPEG WebP AVIF format overviews

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Focus and Sharpness Meter

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