Reduce image file size with JPEG or WebP quality controls and optional dimension limits. Compare original and output bytes, inspect the preview and download locally. Smaller output is not guaranteed.
Your image is never uploaded to any server; all decoding, re-encoding and size comparisons happen locally in your browser. No account or image history is needed. Actual original and output byte counts are compared, and larger exports are clearly identified instead of being presented as savings.
No. Already optimized images, different formats, encoder settings and PNG re-encoding can produce a larger output. The tool shows actual file sizes and labels smaller, larger or unchanged results. It never substitutes the original to disguise a larger export. Try a lower lossy quality, smaller dimensions or another format, then inspect the image.
JPEG and WebP exports use the browser’s encoder with a quality setting from 1 to 100. Lower settings can trade detail for file size; the scale is browser- and format-dependent and does not guarantee a target size. PNG has no quality parameter here: it is losslessly re-encoded from the decoded raster after any optional resizing, with no palette optimization. Converting a lossy source to PNG does not restore lost detail.
No. Original dimensions are kept unless you enable Also limit dimensions. That option fits inside both maximum dimensions, preserves aspect ratio with whole-pixel rounding, never enlarges smaller images and does not crop or pad. Output is limited to 8,192 pixels per side and 16 megapixels; larger originals need the dimension limit enabled.
Static PNG, JPEG and WebP inputs up to 20 MiB, 40 megapixels and 16,384 pixels per side are supported. SVG, GIF, AVIF, HEIC and detected animated PNG/WebP are not supported. PNG and WebP keep transparency where supported. JPEG fills transparent pixels with the chosen background color. Unsupported browser output formats cause an error instead of a silently mislabeled file.
It compares the original selected file’s byte size with the newly encoded output’s byte size. Savings and increases are measured against the original, even when output format or dimensions differ. The exact byte difference is shown in the explanation; the main size boxes show rounded KiB. This is not a network-transfer, gzip or visual-quality measurement.
Canvas export creates a new raster image, so original metadata, encoded bytes and color-profile behavior are not preserved or guaranteed. The browser handles image orientation and interpolation. Changing settings or files discards any old download and pending result. Clear and leaving the page release application-held images and local URLs. Encoding has a 15-second response limit; device memory can impose smaller practical limits.
