JPEG Compressor Online
Reduce JPEG file sizes by adjusting quality settings. All compression happens in your browser using the Canvas API — no images are uploaded to any server.
Image Compressor
Compress and resize images in your browser. Adjust quality, change format, and reduce file size — nothing is uploaded to any server.
Drop an image here or click to browse
PNG, JPG, GIF, WebP, BMP — max 20 MB
About Image Compression
This tool compresses images entirely in your browser using the Canvas API. No data is sent to any server — your images stay completely private.
JPEG: Best for photographs. The quality slider controls lossy compression — lower values mean smaller files but more artifacts. 70-85% is typically a good balance.
WebP: Modern format with superior compression. Produces ~25-35% smaller files than JPEG at equivalent quality. Supported by all modern browsers.
PNG: Lossless format — no quality slider. Best for graphics, icons, and images with transparency. File size depends on image complexity, not a quality setting.
Resizing: Set max width and/or height to downscale images. The tool never upscales — if the original is smaller than the specified dimensions, it keeps the original size.
How does JPEG compression work?
JPEG uses lossy compression based on the Discrete Cosine Transform (DCT). It divides the image into 8x8 pixel blocks, converts them to frequency domain, and discards high-frequency detail that the human eye is less sensitive to. Lower quality settings discard more data, producing smaller files with visible artifacts. Quality levels of 70-85% typically provide the best balance between file size and visual quality.
Common use cases
Web developers compress JPEGs to improve page load times and Core Web Vitals scores. Photographers reduce file sizes for email sharing and web galleries. E-commerce sites batch-compress product images to keep pages fast. Bloggers optimize hero images that are often the heaviest assets on a page.
Frequently Asked Questions
What JPEG quality should I use for the web?
A quality setting of 75-85% typically reduces file size by 50-70% with minimal visible loss. For hero images, use 80-85%. For thumbnails and background images, 60-70% is usually sufficient.
Does JPEG compression remove EXIF data?
Browser-based JPEG re-encoding through the Canvas API strips EXIF metadata (camera model, GPS, settings) by default. This can be a privacy benefit when sharing photos online.