Image Compressor
Reduce image file size without visible quality loss — free, instant, browser-based
Compression Settings
Preset Level
Max Dimensions (optional)
Upload Images to Compress
Drag & drop or click to browse • Multiple files supported
Free Online Image Compressor — Reduce Image File Size Without Quality Loss
Large image files are the single most common cause of slow-loading web pages. A photograph straight from a modern smartphone can easily be 5–10 MB. Upload that to your website without compression, and every visitor has to wait for that file to transfer before the page finishes loading. On mobile connections, that wait can cost you traffic, conversions, and search ranking.
This free online image compressor reduces the file size of JPG, PNG, WebP, GIF, and BMP images using browser-native Canvas API compression. A typical JPEG photograph compresses by 50–80% at the Balanced quality setting with no visible difference to the naked eye. Everything runs locally in your browser — your images are never uploaded to any server.
Upload multiple images at once, choose a quality level (Maximum, Balanced, or Light), optionally set maximum pixel dimensions (for resizing as well as compressing), and download each compressed image individually. The before/after thumbnail comparison shows both the original and compressed image side by side for each file, so you can see exactly how much quality is preserved before you download.
Lossy vs Lossless Compression — What's the Difference?
Lossy Compression
JPEG, WebP (lossy mode)
Lossy compression permanently discards some image data to achieve dramatic file size reductions. The discarded data is chosen to be least perceptible — typically fine detail in smooth colour gradients and backgrounds. A JPEG saved at 80% quality looks essentially identical to the original at 100% quality, but the file can be 4× smaller. The higher the compression level, the more data is discarded — and at very aggressive settings, visible artefacts like blocky edges and muddy gradients appear.
Lossless Compression
PNG, WebP (lossless mode)
Lossless compression removes only redundant data — repeated colour runs, identical pixel blocks — without discarding any visual information. The image can be perfectly reconstructed to its original state. PNG uses lossless compression. File size reductions are smaller (typically 10–40% rather than 50–80%), but quality is perfectly preserved with zero artefacts. Lossless is the right choice for logos, icons, screenshots, and anything with sharp edges or flat colour areas.
This tool automatically applies the appropriate compression type based on the image format. JPEG and WebP files use lossy compression at the quality level you set. PNG files use lossless compression — for PNG, the quality slider affects how aggressively redundant data is removed without discarding any visual information.
Why Image Compression Matters for Website Speed and SEO
Google's Core Web Vitals — the three metrics that directly influence search ranking — are heavily affected by image sizes. Specifically, Largest Contentful Paint (LCP) measures how long it takes for the largest visible element (usually an image) to load and paint on screen. A large uncompressed hero image can push LCP above the 4-second threshold that Google considers "poor." Compressing that image can shift LCP into the "good" range below 2.5 seconds.
Beyond Google rankings, image compression directly affects user experience. Studies consistently show that most users abandon a page that takes more than 3 seconds to load on mobile. Since images often make up 50–80% of a page's total transfer size, compressing them is one of the highest-impact, lowest-effort optimisations available to any web developer or content creator.
Faster Page Load
Smaller images transfer faster, reducing time to first byte and Largest Contentful Paint — key factors in both user experience and Google ranking.
Better Mobile Experience
Mobile users on 4G or slower connections benefit most from compressed images. A 500 KB image loads in well under a second; a 5 MB image might take 10 seconds or more.
Lower Bandwidth Costs
Every MB sent to visitors costs bandwidth. Compressing images reduces your server's data transfer, which lowers hosting costs and CDN fees at scale.
Quality Level Guide — Which Setting to Choose?
Maximum Compression (Quality 60–70%)+
At Maximum, file size is reduced by 70–85% for typical photographs. Some artefacts may be visible on close inspection — fine lines may show ringing, and gradient-heavy images may show banding. For display on screens at typical viewing distances, the difference is minimal.
✓ Best for
Social media posts, email attachments, website thumbnails, previews
✗ Avoid for
Print, archival, professional portfolios
Balanced (Quality 75–85%) — Recommended+
The Balanced setting is the sweet spot for most use cases. It reduces file size by 50–70% while keeping quality high enough that most people cannot distinguish the compressed image from the original at normal viewing distances.
✓ Best for
Website images, blog posts, product photos, gallery images, anything displayed on a webpage
✗ Avoid for
Nothing. Balanced is almost always the right starting point.
Light Compression (Quality 90–95%)+
Light compression strips minimal data — typically 20–40% file size reduction. The quality is essentially indistinguishable from the original. Use this when you need maximum quality and file size is less of a concern.
✓ Best for
Professional photography, client deliverables, images that will be edited further, logos at high resolution
✗ Avoid for
Heavy bandwidth-limited contexts where file size is a priority