Select a supported image file and choose the output format, quality, and maximum dimensions before optimizing. For the example below, start with a 200 by 100 pixel PNG, keep its format, and keep the maximum dimensions at 1920 by 1080. The result remains a PNG with the same dimensions; its encoded bytes and file size may change. Compare the preview and reported size before downloading one result or the complete batch.
Adjust JPEG or WebP quality gradually and inspect fine details at the intended display size. A higher quality setting still re-encodes the image and does not guarantee identical pixels or a smaller file. Accepted uploads can still fail if your browser cannot decode their format. Each file is limited to 100MB, and large decoded images may require substantially more memory than their compressed size.
Input: PNG image, 200 Γ 100 pixels
Settings: Keep format; maximum dimensions 1920 Γ 1080
Output: image/png, 200 Γ 100 pixels
Encoded size: depends on the input and browser encoder
Savings depend on the source, output format, quality and dimensions. Compare the result with the original; re-encoding can produce a larger file.
The image is read and processed locally in your browser. This interface does not provide account saving or a server share action. Copying the output uses your clipboard; downloading creates a local file. Keep your original separately, and check where you paste or upload the result in another application.
Lossy compression (like JPEG) removes some image data to achieve smaller files but may reduce quality. Lossless compression (like PNG) preserves all original data while still reducing file size through more efficient encoding.
Use WebP for modern web applications where you can provide fallbacks for older browsers. WebP offers better compression and supports transparency, making it ideal for both photos and graphics with progressive enhancement.
For JPEG, start with 80-85% quality for photos. For web use, you can often go as low as 70% without noticeable quality loss. Always test on the actual devices and screens your users will use.
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