An image analyzer evaluates an image's dimensions, file size, aspect ratio, format suitability, and web optimization score using the browser's Canvas API. Drop any image to get a multi-dimensional scored analysis with optimization recommendations.
Upload Image
Drop image here or click to upload
JPEG, PNG, WebP, GIF, SVG supported
How We Score Images
- Resolution (20pts) — 800-2000px wide = optimal for web
- File Size (20pts) — Under 200KB = good for web use
- Aspect Ratio (20pts) — Standard ratios (16:9, 4:3, 1:1, 3:2)
- Format Suitability (20pts) — JPEG for photos, PNG for graphics
- Color Depth (20pts) — Unique color count vs file format match
Image Preview
Upload an image to preview
Score Breakdown
How to Use the Image Analyzer
Optimizing images is one of the highest-impact performance improvements you can make to a website. Google's Core Web Vitals include Largest Contentful Paint (LCP), which is directly affected by image size and format. This image analyzer gives you an instant scored report using only your browser — no uploads required.
Step 1: Upload or Drop an Image
Click the upload zone or drag and drop any image file. Supported formats include JPEG, PNG, WebP, GIF, and SVG. The image is loaded into the browser's Canvas API for analysis — no file is sent to any server. You can analyze images up to the browser's memory limit (typically several hundred MB).
Step 2: Read the Metadata Panel
The metadata panel shows the exact pixel dimensions, file size in KB, detected format, and aspect ratio. The estimated DPI assumes the image is displayed at 96dpi (standard screen DPI). Physical print dimensions at 300dpi are also shown — useful for checking if an image is print-ready.
Step 3: Review the Score Dimensions
Each dimension shows a PASS, WARN, or FAIL badge. The resolution score checks width against web standards. File size is scored against the 200KB threshold for web images. Aspect ratio checks for common standard ratios. Format suitability uses color depth analysis to suggest whether JPEG, PNG, or WebP is appropriate. The color depth score estimates unique colors from a pixel sample.
Step 4: Act on Recommendations
The recommendations panel gives specific, actionable suggestions: resize dimensions, target file size, suggested format. For a 4500×3000px JPEG at 2.1MB, the tool would recommend resizing to 1500×1000px and targeting ~200KB — a 10x reduction in file size with minimal visual quality loss at web display sizes.
FAQ
Is the Image Analyzer free?
Yes, completely free. Images are processed entirely in your browser using the Canvas API — no files are uploaded to any server.
What image formats does this tool analyze?
The analyzer works with any image your browser can display: JPEG, PNG, WebP, GIF, SVG, AVIF, and more. Just drag and drop or click to upload.
What is a good image file size for the web?
For web use, aim for under 200KB for most content images. Hero images can go up to 400KB. Product images in galleries should be under 150KB. Images over 500KB noticeably slow page load times and hurt Core Web Vitals scores.
How does the resolution score work?
The resolver scores image dimensions for typical web use. 800-2000px wide is optimal for most content. Under 400px is too small for full-width displays. Over 4000px is unnecessarily large for web use and wastes bandwidth. The score reflects how appropriate the size is for web deployment.
What aspect ratio is best for web images?
Standard ratios score well: 16:9 for videos and banners, 4:3 for traditional photos, 1:1 for social media and product thumbnails, 3:2 for DSLR photos. Non-standard ratios can still score well if they're close to a standard pattern.
What is the difference between JPEG, PNG, and WebP?
JPEG is best for photographs (lossy compression, no transparency). PNG is best for graphics, logos, and screenshots needing transparency (lossless). WebP offers better compression than both for photos and supports transparency. The tool scores format suitability based on color complexity detected in the image.