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Free Tool

Image Compressor

Compress JPG, PNG, and WebP images online without uploading them anywhere. Everything runs in your browser, so your images stay on your device.

  • Free
  • · No signup
  • · Nothing uploaded
  • · Works in your browser
An image file being reduced to a smaller size

Select images to compress

or drag & drop image files here

JPG, PNG, WebP — up to 25.0 MB each, 20 images at a time

Your images are processed in your browser and are not uploaded to Q3 Labs. Nothing about their content is sent anywhere — see the privacy section below for the full explanation.

Compress Images Online

Image compression reduces how many bytes a picture takes up on disk or over a network, either by discarding some visual detail the human eye rarely notices (lossy compression) or by re-encoding the same visual information more efficiently (lossless compression). The goal either way is a smaller file that still looks acceptably close to the original.

This tool does that entirely inside your browser: nothing about the image itself is sent to a Q3 Labs server at any point, before, during, or after compression.

How to Compress an Image

  1. Select an image, or drag and drop one onto the tool above.
  2. Choose a quality level and, if you want, an output format or a smaller size.
  3. Click Compress.
  4. Compare the original and compressed file sizes.
  5. Download the compressed image.

What Is Image Compression?

Lossy Compression

Discards some image detail to shrink the file substantially. JPEG and WebP support this, controlled here by the quality slider.

Lossless Compression

Re-encodes the same pixel data more efficiently with no quality loss at all. PNG output in this tool is always lossless.

File Size

How much storage or bandwidth the image consumes, the number this tool is directly trying to reduce.

Visual Quality

How close the compressed image looks to the original by eye, the tradeoff lossy compression makes against file size.

Dimensions

The image's pixel width and height. Reducing dimensions (not just quality) is often the single biggest lever for shrinking a very large photo.

Format Differences

JPEG, PNG, and WebP each compress differently and support different features, see the comparison below.

JPG vs PNG vs WebP

JPG / JPEG

Lossy, no transparency support, universally compatible. Generally the smallest, most reliable choice for photographs.

PNG

Lossless, supports transparency, tends to produce larger files than JPEG or WebP for photographs. Best for graphics, logos, and images needing sharp edges or transparency.

WebP

Supports both lossy and lossless modes plus transparency, and generally produces smaller files than JPEG or PNG for the same visual quality. Supported by all current browsers.

How Much Can an Image Be Compressed?

There's no single fixed percentage, the result depends on the original format, the image's dimensions, the quality level chosen, what the image actually shows (a simple graphic compresses very differently from a detailed photograph), and how much compression has already been applied to it previously. A JPEG re-compressed at a lower quality than its original will shrink further; a PNG that's already tightly optimized may barely shrink at all.

This tool always calculates and shows the real result from your actual file, rather than a promised number.

Image Compression for Websites

Images are typically the heaviest part of a webpage's total download size. Smaller image files mean less data a visitor's browser has to fetch, which can meaningfully help loading performance, is particularly noticeable on mobile connections, and can help with Core Web Vitals metrics tied to how quickly a page becomes visible and usable.

Compressing images alone doesn't guarantee better Google rankings, page speed is one signal among many, alongside content quality, technical SEO, and overall user experience, but a lighter page is a genuinely useful piece of that bigger picture.

Is This Image Compressor Private?

Yes, by architecture rather than just by promise. This tool decodes and compresses your image using your browser's own built-in Canvas API, entirely on your device. There is no upload step, no server-side image processing, and no point at which your image file crosses the network to reach Q3 Labs.

Closing the tab, removing an image, or clicking Clear All releases the browser's in-memory references to it. Anonymous, non-identifying usage events (like "a compression finished") may be recorded for analytics, but never the image itself, its filename, its dimensions tied to a specific file, or any of its content.

Frequently Asked Questions

Explore more

Looking for where an image came from instead of shrinking one? Try our reverse image search tool. Turning a logo into favicon files next? Try our Favicon Generator. Before sharing a photo publicly, check what it reveals with our Image Metadata Viewer & Remover. Using a compressed image as a social share card? Preview it with our Open Graph & Social Share Preview. Curious how page weight and loading speed affect SEO in general? Read our 2026 technical SEO checklist or check your own site's performance with Buzzing Bee, our free website & SEO audit, or explore our website development services.

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