Upload two images and find every pixel-level difference instantly.
First image
Second image
Compare images side by side and detect every difference with precision.
The image comparison tool analyzes two images pixel by pixel and generates a visual diff highlighting every change between them.
Choose from SSIM, PSNR, MAE, RMSE, AE, and NCC to match the analysis method to the use case.
Get per-channel error counts, difference percentages, and file metadata tables alongside the visual diff output.
The image comparison tool offers 6 analysis methods, each suited to different tasks. SSIM measures structural similarity the way the human eye perceives it, making it ideal for image quality assessment. PSNR calculates the peak signal-to-noise ratio and is commonly used to evaluate compression quality.
For pixel-level counting, AE reports the absolute number of different pixels, while MAE averages the difference across all pixels. RMSE provides a root mean square error metric for statistical analysis, and NCC measures normalized cross-correlation to find how closely two images match. Adjust the threshold from 0 to 100 to control sensitivity.
Compare images before and after compression to measure exactly how much detail is lost. Upload the original file and the compressed version, then let the tool generate a visual diff that highlights compression artifacts. The diff image shows precisely where boundaries, gradients, and fine textures have changed.
The results table reports per-channel error counts for blue, green, and red, plus the total pixel difference as both an absolute count and a percentage. Use this data to find the optimal compression level where file size drops without visible quality loss.
Common scenarios where the image comparison tool saves time.
Compare design mockups against final renders to verify that every element matches the approved layout.
Measure how much detail is lost after compressing an image. Find the optimal compression level with measurable data.
Compare two versions of a photo or graphic to track exactly what changed between revisions.
Compare images in any common format. The tool accepts JPG, JPEG, PNG, WebP, GIF, BMP, and TIFF files. Upload two images in different formats and the tool handles the conversion automatically before running the comparison.
Customize the diff highlight color to red, green, blue, yellow, orange, violet, black, or white. The visual diff image clearly marks every region where the two images differ, and the comparison report can be exported as a downloadable PDF for documentation and sharing.
Drag and drop or browse for the two images to compare. Supported formats include JPG, PNG, WebP, GIF, BMP, and TIFF.
Select a comparison method such as SSIM or MAE. Pick a highlight color and set the sensitivity threshold.
Click Start to analyze both images. The tool generates a diff image with differences highlighted in the chosen color.
View the diff image, per-channel error counts, and difference percentages. Export the report as a PDF.
The tool analyzes two uploaded images pixel by pixel using the selected comparison method. It generates a diff image that highlights every region where the images differ. The results include per-channel error counts for red, green, and blue, plus the total difference as both an absolute count and a percentage.
The image comparison tool supports JPG, JPEG, PNG, WebP, GIF, BMP, and TIFF. You can upload two images in different formats and the tool converts them automatically before running the comparison.
SSIM is recommended for most tasks because it measures structural similarity the way humans perceive quality differences. Use PSNR to evaluate compression quality with a single numeric score. For strict pixel counting, use AE to get the exact number of pixels that changed. MAE and RMSE provide averaged and statistical error metrics for research and reporting.
For the most accurate results, both images should have the same dimensions. If the images have different sizes, prepare them by resizing to matching dimensions before uploading. Use the Img2Go Resize Image tool to adjust both images to the same width and height.
Yes. The image comparison tool is free to use with no signup required. You can compare images online directly in the browser. A cross-project free trial allows 2 comparisons per day.
Upload the original uncompressed image as the first file and the compressed version as the second. Set the comparison method to SSIM or PSNR and click Start. The diff image shows where compression artifacts appear, typically at object boundaries and fine textures. The error percentage tells you how much the compressed image deviates from the original.
Yes. All processing is automated with no human monitoring. Your files are accessible only through unique, non-guessable URLs. The servers are located exclusively in the EU and comply with GDPR regulations.
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