Image Compressor
Reduce image file sizes by up to 80% without visible quality loss — directly in your browser.
What is Image Compressor?
Image compression is one of the single most impactful optimisations you can make for website performance. Images typically account for 50–75% of a webpage's total byte weight, and unoptimised images are the most common cause of slow page loads. A full-resolution JPEG from a modern camera can be 5–10MB; the same image properly compressed for web use should be 50–200KB — a 95%+ reduction with no visible quality difference to the human eye. There are two types of compression: lossy (removes some image data permanently, achieving smaller files at the cost of minor quality reduction) and lossless (reorganises data without loss, achieving moderate size reduction with zero quality change). Modern formats like WebP offer 25–35% smaller files than JPEG at equivalent visual quality, making format conversion a key part of image optimisation. This tool compresses images using smart lossy and lossless algorithms entirely in your browser — no upload to servers, full privacy.
How to Use Image Compressor
- 1
Upload Your Images
Drag and drop or select up to 20 images at once. Supports JPEG, PNG, WebP, GIF, and SVG formats. Files are processed entirely in your browser — never uploaded to any server.
- 2
Set Compression Level
Choose a compression preset (Maximum, Balanced, Minimum) or set a custom quality level (1–100). A quality of 75–85 for JPEG and WebP is typically indistinguishable from the original at web display sizes.
- 3
Download Compressed Files
See the before/after file size comparison and percentage reduction for each image. Download individual files or all compressed images as a ZIP.
Use Cases
Website Performance Optimisation
Before uploading any image to a website, compress it to web-appropriate file sizes. A product page with 10 unoptimised images at 2MB each loads 20MB of image data; compressed to 150KB each, that drops to 1.5MB — a dramatic improvement in page load time that directly affects SEO rankings and conversion rates.
Email and Document Attachments
Email attachment size limits (typically 10–25MB) and slow email clients make large image attachments frustrating. Compress images before attaching to emails, presentations, or documents to reduce file sizes without losing visible quality in digital contexts.
Social Media Uploads
Social platforms re-compress uploaded images using their own algorithms, often producing poor results from large files. Uploading pre-optimised images at or near the platform's recommended dimensions and file sizes gives you more control over final quality than letting the platform compress your originals.
Features
Batch Processing
Compress up to 20 images simultaneously — drag and drop a folder of images and get them all optimised in one operation, saving significant time on large image libraries.
Format Conversion
Convert JPEG and PNG images to WebP format during compression — WebP files are typically 25–35% smaller than equivalent JPEG/PNG, with equivalent or better visual quality.
Before/After Comparison
Side-by-side quality preview with original and compressed versions at 1:1 pixel zoom — verify the compression level is acceptable before downloading.
Privacy-First Processing
All compression happens locally in your browser using JavaScript — your images are never sent to any server, making this tool safe for confidential or sensitive images.
Frequently Asked Questions
Lossy compression permanently removes some image data to achieve smaller files — the human eye cannot detect most of the removed information at typical viewing distances and screen sizes. JPEG and WebP use lossy compression by default. Lossless compression reorganises image data more efficiently without removing any information — PNG and GIF are lossless formats. Lossless produces larger files but pixel-perfect originals, essential for logos, screenshots with text, and images that will be further edited. For photographs at web sizes, lossy at quality 75–85 is indistinguishable from the original and produces files 5–10× smaller than lossless.
General guidelines by image type: Hero/banner images (full width): under 200KB. Product images: under 100KB each. Blog post images: under 150KB. Thumbnails: under 30KB. These are targets for good performance — every 100KB of image weight adds approximately 0.5–1 second to load time on average mobile connections. The target depends on context: a photography portfolio may justify larger images for quality; a product page conversion funnel should be aggressively optimised for speed.
Yes, for most web use cases. WebP provides equivalent visual quality to JPEG at 25–35% smaller file sizes (often more for certain image types). WebP is supported by all modern browsers — Chrome, Firefox, Safari (since 2020), and Edge. The only reason to keep JPEG is compatibility with very old browsers (IE11) or systems that don't support WebP. If you need to support older systems, serve WebP to modern browsers and JPEG as a fallback using the HTML <picture> element with <source type="image/webp"> and an <img> fallback.
Yes — page speed is a confirmed Google ranking factor, and images are the largest contributor to page weight on most websites. Google's PageSpeed Insights and Core Web Vitals metrics specifically flag "Serve images in next-gen formats" and "Efficiently encode images" as improvement opportunities. LCP (Largest Contentful Paint) is often an image — a slow-loading hero image directly harms your Core Web Vitals score. Compressing and properly sizing images is one of the highest-impact technical SEO improvements you can make.
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