Image Compressor

Free Online Image Compressor — Reduce JPG, PNG & WebP File Size

Large image files cause more problems than most people realise. They slow down web pages, chew through mobile data, hit email attachment limits, and consume storage faster than necessary. This free image compression tool lets you shrink JPG, PNG, and WebP files directly in your browser — no account, no upload, no waiting for a server to process your file.

The compression works using the HTML5 Canvas API. Your image is drawn onto an invisible canvas element at the original dimensions, then exported as a JPEG at your chosen quality level. The whole process happens on your device in a fraction of a second. Because your image never leaves your browser, there's no privacy risk and no file size limits imposed by a server.

The quality slider lets you dial in the trade-off between file size and visual quality. A setting of 70% is the sweet spot for most photos — it typically cuts the file size by 50–70% while keeping the image looking clean and sharp to the naked eye. For images that will only be viewed on screen (social media posts, blog thumbnails, email attachments), 70–80% quality is usually indistinguishable from the original. For print-intended images or professional photography, staying above 85% is advisable.

Why Image Compression Matters for Websites

Page speed is one of the most important factors in both user experience and search engine rankings. Google's Core Web Vitals measure how fast a page loads and responds, and images are almost always the biggest contributor to slow load times. A single unoptimised hero image can weigh 3–5 MB and add several seconds to your page load on a mobile connection.

Compressing images before uploading them to your website is one of the simplest and highest-impact things you can do for page speed. A photo compressed to 200 KB instead of 2 MB loads ten times faster — and users on slow connections or mobile data will notice the difference immediately. Search engines will too.

For bloggers, e-commerce store owners, and web developers, making image compression part of your standard workflow is genuinely worth the extra 30 seconds per image.

When to Use Different Quality Settings

The right quality setting depends on what you're using the image for. Here's a practical guide:

• Social media and messaging (50–65%): Platforms like Instagram and WhatsApp compress images again on their end, so there's no point starting with a high-quality file. A moderate setting gets you the smallest upload without visible degradation after the platform's own compression.
• Blog posts and website thumbnails (65–75%): The 70% default here is a reliable general setting. Most visitors won't notice any quality difference, and your pages will load noticeably faster.
• Product photos and portfolio images (75–85%): When image quality matters for credibility (e-commerce, photography portfolios, design work), stay in this range. You still get meaningful file size savings without compromising the detail that makes products look appealing.
• Email attachments (60–70%): Most email clients have attachment size limits. Dropping to 65% quality typically gets a photo under 500 KB while keeping it looking perfectly presentable.
• High-resolution printing (85–95%): If you're compressing an image that will be printed at large sizes, keep quality high. The file size savings matter less here, and print surfaces show compression artifacts more clearly than screens do.

JPEG vs PNG vs WebP — Which Format Should You Use?

Each format has different strengths, and the right choice depends on what your image contains. JPEG is ideal for photographs and complex images with gradients and many colours — it compresses them well without obvious quality loss. PNG uses lossless compression, which means no quality loss at all, but it produces larger files. PNG is the right choice for logos, icons, diagrams, screenshots, and anything with flat colours or sharp edges where JPEG artifacts would be noticeable. WebP is a newer format that generally produces smaller files than JPEG at equivalent quality, with good browser support across modern devices.

This compressor accepts all three formats as input but outputs JPEG, which gives the widest compatibility across browsers, devices, email clients, and document editors.