Powerful compression that runs entirely in your browser — fast, private, and free.
Your images never leave your device. Compression runs entirely in the browser using the Canvas API — no server upload, no data collection, no privacy risk.
Use the quality slider to find the perfect balance between file size and visual quality. See the exact savings in KB and percentage before downloading.
Upload multiple images at once and compress them all in one go. Each image gets its own preview, size comparison, and individual download button.
Supports JPG, PNG, and WebP input. Output as JPEG for maximum compatibility, WebP for the best compression ratio, or keep the original format.
Compression is instant — no waiting for uploads or server processing. Results appear as soon as you drop your images, even for large batches.
Reduce image file sizes dramatically — a 5MB photo can become under 500KB at quality 80, making it ideal for websites, email, and social media.
From web developers to photographers — anyone who works with images benefits from smaller file sizes.
Optimise images before uploading to websites for faster page loads and better Core Web Vitals scores.
Reduce photo file sizes for email delivery, online portfolios, or client proofing galleries without visible quality loss.
Compress images to meet platform upload limits while keeping them sharp for Instagram, LinkedIn, and Facebook posts.
Reduce image sizes for email attachments, presentations, and document uploads to stay within file size limits.
No. Everything happens locally in your browser using the HTML5 Canvas API. Your images are never sent to any server, which means they're completely private and the tool works even without an internet connection after the page loads.
For most purposes, 75–85% quality is the sweet spot — it reduces file size significantly (often 60–80%) while keeping images visually indistinguishable from the original. For thumbnails or preview images, 60–70% is fine. For print or archival use, stay above 90%.
PNG is a lossless format, so the quality slider has less effect on PNG output. For the best size reduction on PNG files, switch the output format to JPEG or WebP — you'll see much larger savings. Note that converting PNG to JPEG removes transparency.
WebP is a modern image format developed by Google that provides superior compression compared to JPEG and PNG. WebP images are typically 25–35% smaller than JPEG at equivalent quality. All major browsers support WebP, making it ideal for web use.
You can upload and compress multiple images at once. The tool processes them all simultaneously in your browser. For very large batches (50+ images), processing may take a moment depending on your device's performance.
No — this tool only reduces file size through quality compression, not by resizing. The output image will have exactly the same pixel dimensions as the original. If you also need to resize, use our free Image Resizer tool.
There's no hard limit — it depends on your browser and device memory. Most modern browsers handle images up to 20–30MB without issue. Very large RAW photos (50MB+) may be slow to process on older devices.
Yes. The tool is fully responsive and works on iOS and Android browsers. Drag and drop is replaced with a tap-to-upload interface on mobile, and all compression features including batch processing work the same way.
Image compression is the process of reducing the file size of a digital image while preserving as much visual quality as possible. In a world where page load speed directly affects SEO rankings, user experience, and conversion rates, image compression has become one of the most important skills for anyone who publishes content online. Images typically account for 50–80% of a web page's total weight — optimising them is the single highest-impact performance improvement most websites can make.
There are two fundamental types of image compression. Lossless compression reduces file size without discarding any image data — the decompressed image is pixel-for-pixel identical to the original. PNG uses lossless compression, which is why PNG files tend to be larger than JPEGs. Lossless is ideal for logos, icons, and screenshots where crisp edges and text legibility matter.
Lossy compression achieves much greater size reductions by permanently discarding image data that the human eye is unlikely to notice. JPEG uses lossy compression, which is why a 5MB RAW photo can become a 300KB JPEG with barely visible quality difference. The "quality" setting controls how aggressively data is discarded — lower quality means smaller file size but more visible artefacts, particularly in areas with sharp colour transitions.
JPEG (or JPG) is the most widely used format for photographs and complex images with gradients. It supports lossy compression and is universally compatible across all devices, browsers, and applications. JPEG does not support transparency. For photographic content on the web, JPEG at 75–85% quality is the standard recommendation.
PNG was designed for web graphics and supports both lossless compression and transparency (alpha channel). It's the correct choice for logos, UI screenshots, and any image that requires a transparent background. However, PNG files are significantly larger than JPEG for photographic content, which is why converting a photo PNG to JPEG or WebP dramatically reduces file size.
WebP is Google's modern image format that combines the best of both worlds — it supports both lossy and lossless compression, handles transparency like PNG, and typically achieves 25–35% smaller file sizes than JPEG at equivalent quality. All modern browsers support WebP, and it's increasingly the recommended format for web images.
Google's Core Web Vitals include Largest Contentful Paint (LCP), which measures how quickly the main content of a page loads. Unoptimised images are the most common cause of poor LCP scores. A page that takes 6 seconds to load loses approximately 53% of mobile visitors before they even see the content. Compressing images to under 200KB each — and using modern formats like WebP — is one of the most effective ways to improve LCP.
Beyond performance, image compression reduces bandwidth costs for both the website owner (server egress) and the user (mobile data usage). For e-commerce sites with hundreds of product images, the difference between optimised and unoptimised images can mean the difference between a fast, high-converting site and a slow one that frustrates customers.
Use JPEG or WebP for photographs and complex images, and PNG only when transparency is required. Aim for file sizes under 200KB for hero images, under 100KB for content images, and under 50KB for thumbnails. For product images on e-commerce sites, 60–80KB is achievable at quality 80 without visible degradation.
Always check the compressed preview before downloading — at quality 70–80, most photographic images look identical to the original on screen but are 60–80% smaller. Only go below 70% quality if you need very small file sizes and can tolerate some artefacts. For images with text overlays or sharp geometric shapes (infographics, diagrams), stay at 85%+ quality to prevent visible compression artefacts around text edges.