Image Compressor

What is the Image Compressor?

The Image Compressor shrinks JPG, PNG and WebP files in your browser so pages load faster and email attachments go through, without uploading anything to a server. Drop in an image, choose a quality level, watch the before-and-after file size update live, and download the result. A 4 MB phone photo typically comes out at 300 to 500 KB with no visible change at normal viewing sizes.

How to use it

1. Drag an image onto the drop zone or click to choose one.
2. Move the quality slider. 75 to 85 is the sweet spot for photos; the preview and the new file size update as you drag.
3. Optionally set a maximum width so a 6,000-pixel camera image is scaled down to something a web page can actually display.
4. Compare the original and compressed previews side by side, zooming in on detail if you like.
5. Click Download. The file keeps its name with a suffix so the original is never overwritten.

Features

• On-device compression. Uses the browser’s canvas encoder, so private photos and client work stay on your machine.
• Live size readout showing the original size, the new size and the percentage saved.
• Quality slider plus optional resize so you control both the encoding and the pixel dimensions.
• JPG, PNG and WebP in and out; convert while compressing if you want a smaller format.
• No limits, no watermark, no account.

How much should you compress?

For photos on a web page, JPG or WebP at quality 75 to 82 is almost always indistinguishable from the original at 100 percent zoom and cuts the file by 60 to 80 percent. Screenshots, logos and diagrams with flat colour and sharp edges compress better as PNG or WebP than as JPG, which blurs hard lines. If the image will only ever be shown at 800 pixels wide, resizing it to 1,600 pixels (for high-density screens) before compressing removes far more weight than any quality setting. Read the full breakdown in how to compress images for the web without losing quality.

Why it matters for SEO and speed

Images are usually the heaviest part of a page. Oversized images push out Largest Contentful Paint, one of Google’s Core Web Vitals, and on mobile connections they are the difference between a page that loads in two seconds and one that loads in eight. Compressing to a sensible size, serving WebP where you can, and setting width and height attributes are the three fixes that move the needle most. Check your own pages with the SEO Site Analyzer.

Related tools

Have a whole folder? The Bulk Image Compressor handles many files at once. Need different dimensions rather than a smaller file? Use the Image Resizer. Switching formats is what the Image Converter is for.

Frequently asked questions

Does compression reduce quality?

JPG and WebP are lossy, so yes, slightly; at 75 or above the difference is invisible at normal size. PNG compression here is lossless unless you resize.

Is the image uploaded?

No. Everything happens in the browser. You can disconnect from the internet after the page loads and it still works.

What is the maximum file size?

There is no hard limit, but very large files (over 50 MB) can be slow on phones.

Does it keep EXIF data?

No. Re-encoding strips camera metadata and location data, which is usually what you want before publishing.

Will the transparency in my PNG survive?

Yes when you export as PNG or WebP. Exporting to JPG flattens transparency onto white, since JPG has no alpha channel.

Can I compress HEIC photos from an iPhone?

Not directly; browsers cannot decode HEIC. Export the photo as JPG from the Photos app first, or set the camera to “Most Compatible”.