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Free online tool
Compress, resize, and convert images with adjustable quality — entirely in your browser. No uploads, no servers, zero data leaves your device.
Drag & drop images here, or click to browse
JPEG, PNG, WebP, AVIF, SVG, GIF, BMP, TIFF • Up to 20 files • 50 MB max each
Privacy: Compressed entirely in your browser. Your images never leave your device.
An image compressor reduces the file size of images by applying compression algorithms that remove unnecessary data while preserving visual quality. Large image files are one of the biggest contributors to slow website load times, increased storage costs, and poor user experience on mobile devices. This free online Image Compressor uses the HTML5 Canvas API to compress, resize, and convert images entirely in your browser — your photos and graphics are never uploaded to any server. It supports batch processing of up to 20 files at once, with adjustable quality settings and output format conversion between JPEG, PNG, and WebP.
When you upload an image, the browser's Canvas API draws the image onto an off-screen canvas element. If a max resolution is set, the canvas is scaled down proportionally first. The canvas then exports the image in your chosen format (JPEG, PNG, or WebP) at the specified quality level. For JPEG and WebP, the quality parameter controls the lossy compression — lower values discard more visual information, resulting in smaller file sizes with some quality loss. For PNG, the output is always lossless (the quality slider has no effect). The original and compressed file sizes are compared to show you the savings percentage. All processing happens in a single browser thread with no network requests.
You have 8 product photos from a DSLR camera, each around 5 MB, and need to upload them to your e-commerce website where the CMS enforces a 500 KB file size limit.
Each image is reduced from ~5 MB to ~200–400 KB — well within the CMS limit — while retaining excellent visual quality. Total savings: over 90% in file size.
No. This Image Compressor runs entirely in your browser using the HTML5 Canvas API. Your images are never transmitted over the network. All compression, resizing, and format conversion happens locally on your device.
You can upload JPEG, PNG, WebP, AVIF, SVG, GIF, BMP, TIFF, and ICO files. The output can be saved as JPEG, PNG, or WebP. When set to 'Auto', the tool keeps the same format as your input (defaulting to JPEG for uncommon formats).
PNG is a lossless format, so the quality slider does not affect its file size. The browser's Canvas API may produce a larger PNG than the original if the original was optimized with specialized tools. For smaller files, try converting to WebP or JPEG instead.
If your image exceeds the chosen resolution (e.g., 1920px), it will be proportionally scaled down before compression. This is useful for reducing both file size and pixel dimensions at once. Selecting 'Original' keeps the image at its native resolution.
Each individual file can be up to 50 MB. You can process up to 20 files in a single session. Very large images may take a few seconds to process depending on your device's hardware.
For JPEG and WebP, the slider controls the lossy compression level. Lower values mean more aggressive compression (smaller files, more artifacts). 70–80% offers a good balance between quality and file size. For PNG output, the slider has no effect because PNG is always lossless.
Image compression is one of the highest-impact optimizations for web performance, storage costs, and user experience. This free Image Compressor handles batch processing, format conversion, and resizing — all in your browser, with zero data leaving your device. Whether you are optimizing a personal blog or preparing assets for a large e-commerce site, this tool delivers professional-grade compression with complete privacy.