Compress Images Instantly

What is image compression and why does it matter?

Image compression reduces the file size of an image by discarding or encoding redundant pixel data more efficiently. A photo from a modern smartphone can be 6–15 MB — far too large for most web, email, or social media use. Compressing it brings the file size down to 200 KB–1 MB while keeping the image visually indistinguishable from the original at screen sizes.

For websites, image compression is one of the highest-impact performance optimisations available. Images are typically the largest assets on a web page, and their file size directly affects how fast the page loads — which in turn affects Google search rankings through Core Web Vitals metrics like Largest Contentful Paint (LCP).

When to compress images — and why

• Websites and landing pages. Every extra kilobyte increases page load time. A 3 MB hero image compressed to 200 KB loads 15× faster — and Google notices. Compress every image before uploading to your CMS.
• Email attachments. Gmail limits attachments to 25 MB; Outlook to 20 MB. A batch of uncompressed photos can easily exceed those limits. Compressing first makes attachments send reliably.
• Social media uploads. Instagram, Facebook, and Twitter recompress images automatically on upload — often degrading quality further. Uploading a pre-compressed image at the right size gives you control over the final quality the platform produces.
• E-commerce product photos. Shopify, WooCommerce, and Amazon require fast-loading product images. Compressing product photos reduces page load time, lowers bounce rate, and improves conversion.
• WhatsApp and messaging apps. Messaging apps automatically compress images, often making them blurry. Sending a pre-compressed image at 80–85% quality preserves more detail than letting the app crush it automatically.
• Cloud storage and backups. Storing thousands of uncompressed photos in Google Photos, iCloud, or Dropbox consumes gigabytes of storage. Compressing before backup extends free storage for years.
• Online marketplaces and listings. eBay, Etsy, and classified platforms impose image size limits on listings. Compressing photos before upload prevents rejection errors and speeds up the listing process.

JPEG, PNG, WebP, SVG — which format should you use?

How to choose the right quality setting

The quality slider controls how aggressively the image is compressed. Lower values produce smaller files with more visible compression artefacts; higher values produce larger files with better quality.

• Quality 90–100: Near-lossless. Use for print, archival, or professional photography deliverables where quality cannot be compromised.
• Quality 75–85: The web sweet spot. Typically reduces file size by 60–75% with virtually no visible quality loss at screen sizes. Recommended for most use cases.
• Quality 60–75: Good for email thumbnails, social media previews, and contexts where bandwidth matters more than pixel-perfect quality.
• Quality below 60: Aggressive compression with visible artefacts. Suitable only for very small thumbnails or situations where file size is the sole priority.

How the image compressor works

This tool compresses images entirely inside your browser — no file is ever uploaded to a server. Here is what happens when you drop an image:

• JPEG and WebP: The image is drawn onto an HTML Canvas element and re-exported using the browser's built-in JPEG or WebP encoder at the quality level you choose. This is the same encoder used by Chrome and other browsers natively.
• PNG: The image is processed using pngquant compiled to WebAssembly — the same algorithm used by TinyPNG. It reduces the colour palette from 16.7 million colours to 256 using quantisation, typically achieving 40–70% size reduction.
• SVG: SVG files are optimised by removing unnecessary metadata, whitespace, and redundant path data from the XML.

Frequently asked questions