Image Compression Savings Calculator (2026)

Original total image size (KB)

Compressed total image size (KB)

Average connection speed (KB/s)

Bytes saved

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Percent reduction

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Load time before

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Load time after

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Load times are estimates for the image weight alone, at the connection speed you set, not full page load time.

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An image compression savings calculator turns a before-and-after file size into the numbers that actually matter for page speed: total bytes saved, percent reduction, and estimated load time at a real connection speed. Enter your images' combined size before and after compression, along with a connection speed, and the tool shows exactly how much faster that page's images will load.

Why image weight matters for speed and rankings

Images are usually the single heaviest asset type on a typical web page, and unnecessarily large image files are one of the most common, most fixable causes of slow page load. Since page speed factors into both user experience and Core Web Vitals, which Google uses as a ranking signal, compressing images without visibly degrading quality is one of the highest-leverage technical SEO fixes available on most sites.

How the savings and load time are calculated

The calculator subtracts your compressed size from your original size to get total bytes saved, then divides that by the original to get a percentage. Load time before and after divides each file size by your connection speed, giving a rough estimate of how long the images alone take to download. Real load time depends on many other factors, like server response time, caching and other page assets, so treat these figures as an image-specific piece of the total page speed picture.

Using this after an image compression pass

Run this calculator after compressing images with a tool like TinyPNG, Squoosh or your CMS's built-in optimizer, comparing your total image folder size before and after. If the percent reduction looks small, check whether images are already using a modern format like WebP or AVIF, and pair this with a page speed budget calculator to see whether your total page weight now fits within a target load time.

Image Compression Savings Calculator: questions, answered

What connection speed should I use?

A common reference point is roughly 400 to 600 KB/s for average mobile connections and 1,000+ KB/s for typical broadband. Use whatever speed represents your actual audience, slower for markets with more mobile or rural traffic, faster for a primarily desktop, urban audience.

Does this include every asset on the page, like JavaScript and CSS?

No, this calculator is scoped specifically to image weight. For a full page byte budget across images, JS, CSS and fonts, use a dedicated page speed budget calculator alongside this one.

Why is my percent reduction lower than I expected?

If your images were already reasonably optimized, or already served in a modern format like WebP, additional compression tools have less redundant data left to remove. Very high original compression ratios usually mean the source images were unusually large or uncompressed to begin with.

Should I compress images even if my percent reduction looks small?

Yes, small percentage savings still add up across many images and many page views, and there's rarely a downside to compression that doesn't visibly reduce image quality.

Is a smaller file always better for SEO?

Generally yes for load time, but not at the cost of visible quality loss on important images, since that can hurt engagement and conversions. Aim for the smallest file size that still looks sharp on the devices your visitors actually use.