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Image Size Comparison

Compare formats and quality settings side by side.

Image Tools Reviews Free · no sign-up

Drop a representative image here, or click to choose one

Use one that is typical of your library, not the easiest one you have

Quick Tool Overview

Image Size Comparison encodes one of your own images as JPEG, WebP and AVIF across a range of quality settings and lays the results out together. A drag-to-compare slider puts any two against each other at full resolution, which is the only honest way to decide whether a saving costs anything visible. Any result downloads directly.

What it does
Encodes one image many ways and compares them
You give it
A representative image from your library
You get back
A size table and a visual comparison
Best for
Choosing a format and quality for a whole site
Image Tools Free, unlimited use No sign-up Runs in your browser

About the Image Size Comparison

Arguments about image formats are usually settled by benchmarks run on somebody else's photographs. Your images are not those images, and the honest answer is to test with your own.

Drop one in and it is encoded as JPEG, WebP and AVIF across a range of quality settings, with every result listed by size and drawn so you can look at it. A drag-to-compare slider puts any two of them against each other at full resolution, which is the only way to judge whether a saving costs anything you can actually see. Any result can be downloaded directly, so the comparison doubles as a compressor.

Key features of the Image Size Comparison

Your images, not benchmarks

Published comparisons use somebody else's photographs; this uses the ones you actually ship.

Drag-to-compare slider

Two results at full resolution under one divider, which is how a difference either shows or does not.

Three formats, several qualities

JPEG, WebP and AVIF across a spread of settings, all in one pass.

Marks what your browser cannot do

AVIF encoding needs Chrome or Edge; where it is missing the row says so rather than quietly disappearing.

Doubles as a compressor

Any row in the table can be downloaded, so the test and the conversion are the same step.

How to use the Image Size Comparison

  1. 1

    Add a representative image

    Use one that is typical of your library, not the easiest one you have.

  2. 2

    Read the size table

    Every format and quality combination is listed with its file size and saving.

  3. 3

    Compare two side by side

    Drag the divider to put any two results against each other at full resolution.

  4. 4

    Download the winner

    Any row can be saved directly, so the test doubles as the conversion.

Frequently asked questions

AVIF on size, WebP on the balance of size and support, JPEG on compatibility. On flat graphics the order changes, which is exactly why testing your own images matters.

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