Image Compressor - Online Optimize JPEG & PNG Locally

This tool uses your browser's built-in Canvas API to compress images entirely on your device. When you upload an image, it's loaded into an HTML5 Canvas element, re-encoded at your specified quality setting, and output as a new compressed file. No data is ever uploaded to any server — everything happens locally, ensuring complete privacy and security. This approach is similar to how Google's Squoosh works, but with a simpler, more focused interface.

Absolutely safe. This is a client-side only tool — your images are processed entirely within your browser's memory. They are never transmitted, uploaded, or stored on any external server. Unlike many online compressors (TinyPNG, Compressor.io, etc.) that require uploading files to remote servers for processing, our tool keeps everything local. This makes it ideal for sensitive documents, personal photos, business assets, and any situation where privacy matters. You can even disconnect your internet after loading the page and the tool will continue working perfectly.

• JPEG: Best for photographs and complex images with many colors. Uses lossy compression — excellent file size reduction. Does NOT support transparency. Ideal for blog posts, social media, and product photos.
• PNG: Best for graphics, logos, screenshots, and images requiring transparency. Uses lossless compression — preserves every pixel perfectly. Generally produces larger files than JPEG. Use when quality and transparency are critical.
• WebP: A modern format that combines the best of both worlds — supports both lossy and lossless compression, plus transparency. Typically achieves 25-35% smaller files than JPEG at equivalent quality. Supported by all modern browsers (Chrome, Firefox, Edge, Safari 14+). Recommended for most web use cases.

For most web use cases, a quality setting of 70-85% provides an excellent balance between visual quality and file size. At 80% quality, most JPEG images show minimal perceptible quality loss while achieving 50-70% file size reduction. For WebP, you can often go as low as 60-75% and still get great results. We recommend testing different quality levels using the live preview to find the sweet spot for your specific image. For high-DPI (Retina) displays, consider using 85-90% quality to maintain crispness.

This can happen because the browser's Canvas API re-encodes PNG images from scratch, and its PNG encoder is not as optimized as dedicated tools like TinyPNG or OptiPNG. If your original PNG was already well-optimized, the re-encoded version may be larger. Solutions: (1) Switch output format to WebP or JPEG for dramatically smaller files while keeping transparency (WebP) or accepting no transparency (JPEG). (2) Reduce the maximum width to shrink dimensions. (3) If you must keep PNG format, the size reduction will primarily come from dimension scaling rather than encoding optimization.

Yes! You can upload multiple images simultaneously by dragging a folder or selecting multiple files. Each image appears in the queue and can be compressed individually with the same settings. Use the "Download All" button to save all compressed images in one go. Note that each image is processed independently, and you can click through the queue to preview each one before downloading.

Yes, significantly. Page speed is a confirmed Google ranking factor, and images often account for 50-75% of a webpage's total weight. Properly compressed images lead to faster load times, lower bounce rates, and better Core Web Vitals scores (especially Largest Contentful Paint). For SEO best practices: keep images under 200KB when possible, use descriptive filenames, always include alt text, and serve images in next-gen formats like WebP. This tool helps you achieve all of these goals while maintaining visual quality.

The tool handles images up to approximately 4096×4096 pixels safely across all modern browsers and devices. For larger images, we recommend setting a max width (e.g., 2048px or 4096px) in the settings panel, which automatically downsizes the image during compression. In terms of file size, there's no hard limit — however, very large files (50MB+) may be slow to process on mobile devices. The tool works best with standard web images under 20MB.

Privacy: Sensitive images never leave your device — critical for business documents, personal photos, and confidential assets.
Speed: No upload/download time — compression is instant on modern devices.
No limits: No file count or size restrictions imposed by server quotas.
Offline capability: Works without an internet connection after the page loads.
No tracking: Your usage isn't monitored or logged by third parties. The trade-off is that browser-based PNG compression is slightly less efficient than specialized server tools like TinyPNG, but for JPEG and WebP, the results are excellent.

Absolutely! The tool is fully responsive and works on iOS Safari, Android Chrome, and all modern mobile browsers. You can compress photos directly from your phone's gallery. A few tips for mobile: large images (12MP+) may take slightly longer to process, so consider using the max-width setting to reduce resolution for faster compression. The drag-and-drop feature works on iPad and some Android tablets. For the best mobile experience, use the "Browse" button to select images from your photo library.