Image Quality & Resolution Checker

Check the resolution of any image online — pixel dimensions, DPI, and the largest size it can be printed at — plus bytes per pixel and an edge-detail map. Free, no signup.

Drag & drop a file here, or

JPG PNG WebP GIF BMP AVIF TIFF HEIC Max 50MB

Processed on our server

  1. Step 1 Upload a photo — JPG, PNG, WebP, HEIC, TIFF or AVIF.
  2. Step 2 Read its resolution in pixels, its DPI, and the print size it supports.
  3. Step 3 Read the print size, bytes per pixel and the edge map before you print, publish or compress it.
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Print Suitability

Check if resolution is sufficient for various print sizes.

Web Optimization

Verify good quality-to-size ratio for web use.

Technical Metrics

Megapixels, aspect ratio, color depth, bytes per pixel.

How it works

How scoring works

This image quality checker reports plain facts: pixel resolution, DPI at print sizes, and bytes per pixel (file size divided by pixel count). It also draws an edge-detail map with one raw Laplacian variance reading, placed on a log ruler beside measured reference images. There is no score and no percentage: pure noise reads higher than a sharp photo, and a clear sky reads low without being soft, so the edge reading is a map to look at, not a grade. The numbers are exact, so you can compare them across files and export settings. Read our image quality guide for deeper optimization tips.

Resolution vs quality

High resolution doesn't guarantee high quality — a 20MP image compressed to 200KB will show visible JPEG artifacts despite its pixel count. Conversely, a well-preserved 8MP image can outperform a poorly compressed 20MP one for most uses. The Quality Analyzer works as both a pixel checker and a photo resolution checker, evaluating not just how many pixels you have but how much visual data each pixel retains after compression. If you're wondering how to check image resolution alongside compression health, this tool answers both questions in a single scan. This distinction is critical when evaluating images from different sources — a phone photo, a stock image download, and a social media screenshot may have similar pixel counts but vastly different quality levels.

Professional applications

Photographers use this photo quality tester to verify that exported files meet client delivery standards — a quick way to check image quality online before sending deliverables. E-commerce teams run every product image through this photo quality analyzer before uploading to storefronts, because poor quality images directly impact conversion rates. Stock photography platforms reject submissions that fall below resolution and sharpness thresholds, so contributors test image quality before every submission. Print shops use it as a print quality checker to evaluate incoming files and flag issues before production, avoiding costly reprints and delays. Content creators verify thumbnails and social media crops maintain acceptable quality after platform compression.

Quality analysis vs print readiness

This image quality tester shows resolution, bytes per pixel and where the edge detail sits. The Print Readiness Scanner focuses on dimensions and DPI — can the image be printed at a specific size without pixelation? If you need to know how to check photo resolution for print, use both tools together: verify that your image is both high quality and large enough for the intended print dimensions. For full metadata inspection, pair with the EXIF Checker.

Image quality degrades at every step of the digital pipeline — export settings, social media compression, messaging app re-encoding, and repeated saves all reduce data integrity. Understanding where quality is being lost helps photographers, designers, and content creators make better decisions about export formats, compression settings, and delivery methods. Instead of relying on subjective visual assessment on a single screen, use this image quality checker online to get an objective baseline measurement — upload any picture to read the individual figures rather than guessing from a single screen. Every photo quality test takes seconds and works with JPEG, PNG, WebP, HEIC, and TIFF files.

For web optimization, image quality directly affects Core Web Vitals — oversized or poorly compressed images slow page loads, increasing bounce rates and hurting search rankings. Run product images through this photo quality analyzer before uploading to storefronts, and use the Image Compressor to reduce file size after confirming quality is acceptable. To analyze multiple images at once, the Batch Scanner flags low-quality files across an entire set. For checking whether your image has enough DPI for a specific print size, see the resolution checker. Visit the image optimization hub for format-specific guidance, or use the Image SEO Checker to verify your images meet search engine requirements for filename, format, dimensions, and compression.

For specific use cases, see our step-by-step guides: Image Resolution Checker, and Check Image Resolution Online.

Frequently Asked Questions

What quality metrics are analyzed?

Pixel resolution (width x height and megapixels), DPI read from the image metadata, maximum print size at 300 / 150 / 72 DPI, aspect ratio, bytes per pixel, and an edge-detail map with one raw Laplacian reading. Nothing is combined into a quality score or a percentage.

How do I check the resolution of an image online?

Drop the photo onto this page. The Resolution & Print block shows the pixel dimensions, megapixels, aspect ratio, DPI and the largest size the image can be printed at without pixelation. Nothing to install, no signup, works on phone and desktop.

What resolution is needed for printing?

For sharp photo prints, aim for 300 DPI at the final size: a 4x6 inch print needs about 1200x1800 pixels, an 8x10 needs 2400x3000 (7.2 MP). Large posters seen from a distance are fine at 150 DPI, which halves those numbers.

What DPI is my image, and where does that number come from?

The DPI shown is the resolution tag stored in the file metadata (EXIF/JFIF); when a file carries no tag we report the 72 DPI web default. That tag is only a printing instruction — it does not change how many pixels the file actually contains, which is what really decides print quality.

What is the maximum print size for my photo?

Divide the pixel dimensions by the target DPI: a 4000x3000 photo prints at 13.3x10 inches at 300 DPI, or 26.7x20 inches at 150 DPI. The analyzer does this for you in inches and centimetres and checks the result against standard print sizes.

Is higher resolution always better?

For web use, very high resolution wastes bandwidth. For print, higher resolution enables larger prints.

Is my image uploaded to a server?

Partly. The pixel analysis (resolution, edge detail, bytes per pixel) runs in your browser via the Canvas API, but reading the DPI and camera metadata needs a server-side pass, so a copy of the file is sent to our metadata endpoint and deleted automatically within the hour. Nothing is published, shared or kept.

Does checking the resolution change my image?

No. The analyzer only reads the file. Your original is never resized, re-compressed or overwritten — download nothing, and nothing changes.

Why is there no single quality score?

Because nothing here has a defined scale. The edge reading reflects the subject as much as the capture: pure noise reads higher than a sharp photo, and clear sky or a shallow depth-of-field portrait read low without being faults. Read resolution, bytes per pixel and the edge map against what you need the image for.

How is sharpness measured?

Sharpness is estimated using Laplacian variance — a mathematical measure of edge contrast. The tool shows the raw value on a log ruler beside measured references, not as a grade. A high value means many strong edges, which can be detail or noise. Use the edge map to see where they sit.

What DPI should I use for web vs print?

Web images display at 72-96 DPI, so the DPI tag is irrelevant online — only pixel dimensions matter. Print wants 300 DPI for sharp results, 150 DPI for large-format work. This page gives you both print sizes directly; the Print Readiness Scanner adds a pass/fail check against a list of standard formats.

Can I check quality before uploading to social media?

Yes. Upload your photo to see resolution, bytes per pixel and the edge map. Social platforms compress further, so starting with high quality produces better results after processing.

Image Quality Optimization Workflow

Checking image quality is usually the first step in a larger optimization workflow. Whether you are preparing images for web, print, or social media, start here and then move to the right tool for your next step.

After analyzing quality with this tool, use the Image Compressor to reduce file size while maintaining acceptable quality — the bytes-per-pixel figure tells you how much data the file is already carrying per pixel, which is a better guide than a single number. If the image needs to be a different size, the Image Resizer adjusts dimensions for specific use cases like social media posts, email attachments, or print targets.

For web publishing, convert images to modern formats using the Format Converter — WebP files are 25-35% smaller than JPEG at the same quality. Before sending to print, verify exact DPI requirements with the Print Readiness Scanner, which calculates maximum print dimensions at 300 DPI for every standard paper size.

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