Resize and re-encode JPG, PNG, or WebP images in your browser. Compare the actual output size and dimensions, then keep or discard the result—smaller files and unchanged visual quality are not guaranteed.
Quality affects JPEG and WebP encoding. PNG output is lossless and ignores the quality slider. Dimensions never exceed the selected width and height.
Drop images here or click to upload
Supports JPG, PNG, and WebP • Multiple files allowed
Upload a JPG, PNG, or WebP image. You can drag and drop or click to browse. The tool shows the original file size so you can compare the compression saving.
Choose the maximum dimensions and output format. The quality slider affects JPEG and WebP; PNG ignores it. A lower quality setting often reduces bytes but can introduce visible artifacts.
Compare output bytes, dimensions, format, and visible detail before downloading. Mizakii does not receive the selected image or result; your browser handles the local download.
JPEG and lossy WebP encoding discard information to reduce bytes. Visible effects depend on the source and quality setting, so inspect text, edges, gradients, and fine detail at the size where the image will be used.
PNG encodes pixels losslessly, but Canvas re-encoding can discard metadata and resizing still changes the pixel grid. PNG can be larger than JPEG or WebP for photographic content.
| Format | Quality control in this tool | Transparency | Important limitation |
|---|---|---|---|
| PNG | Ignored (lossless encoding) | Yes | May be larger; resizing still changes pixels |
| JPG/JPEG | Applied (lossy) | No | Transparent pixels are filled white when converting |
| WebP | Applied (lossy) | Yes | Exact codec output varies by browser |
Image bytes, intrinsic dimensions, responsive delivery, and loading priority all affect page performance. Compression alone does not guarantee a better Core Web Vital: serve dimensions close to the rendered size, provide width and height to prevent layout shifts, use responsive sources where appropriate, and do not lazy-load the page's Largest Contentful Paint image. Measure the actual page after replacing an asset.
Extract editable text from images locally
Convert JPG to PNG format
Generate QR codes
HELP ANOTHER PERSON SKIP THE UPLOAD