Image Optimizer reduces file size by compressing JPG and PNG images using browser-image-compression — a WASM-backed library that runs entirely in your browser tab. Set a target max size or quality level and compare before/after.
Drop a JPG or PNG or click to browse
It depends on the original image, but 40-70% size reduction is common for JPEGs at quality 80. PNG compression is lossless and typically achieves a smaller 10-30% reduction since no detail is discarded.
Not in the current version — output is always in the same format as the input (JPG or PNG). WebP support is being considered for a future update.
At the default quality settings, most compression is visually lossless or close to it. Lowering the quality slider further trades visible sharpness for smaller files.
Very large images (tens of megabytes) may take longer to process since everything runs in your browser, but there's no hard upload limit imposed by the tool.
The current version processes one image at a time so you can review the before/after comparison for each file individually.
Image Optimizer keeps the original dimensions and reduces file size through compression. Image Resize changes the pixel dimensions of the image, which can also reduce file size as a side effect.
Smaller image files load faster, which improves page speed scores, reduces bandwidth costs, and can improve search rankings since page speed is a ranking factor.
