Image Compressor

This tool takes an image you drop in, redraws it onto an in-browser canvas, and re-encodes it as WebP at a quality level you control with a slider — showing the original and compressed file side by side, with the size of each and the percentage saved. Nothing is uploaded to a server; the entire process runs in your browser using the Canvas API.

It's for anyone about to add an image to a page — a service business owner uploading photos of finished work, someone adding a hero image to a landing page, a blogger inserting screenshots — who wants a smaller file without opening a full image editor or installing a compression app.

File size matters because it's one of the most common causes of slow page loads, and page speed feeds directly into Core Web Vitals — specifically Largest Contentful Paint, which measures how long it takes the biggest visible element (often a hero image) to render. Beyond the ranking angle, a slow image is something a visitor notices immediately: pages that take visibly longer to load lose visitors before they ever see the content the image was supporting.

How to use this tool

1. Click the upload area, or drag a file onto it, to choose a JPG, PNG, or WebP image.
2. Compression happens immediately at the default 82% quality — no separate button to click.
3. Drag the quality slider left or right to trade off file size against visual quality; the compressed preview and file size update live as you move it.
4. Compare the original and compressed images side by side, including the size of each and the percentage saved shown above them.
5. Once you're happy with the result, click "Download compressed image" to save the WebP file.
6. Click "Choose a different image" to start over with a new file without reloading the page.

After you download the compressed file

Compression only solves file size — it doesn't fix a generic filename like IMG_4821.webp or a missing alt attribute, and both of those matter for how Google understands the image. Before you upload it to your site, rename the file to something descriptive — kitchen-remodel-newark-nj.webp rather than whatever your camera or phone named it — and add real alt text once it's placed on the page. The Image SEO guide linked below covers both in more detail.