Compress JPG and WebP Images Online

Check the pixel dimensions and file-size limit required by your website or form first. If a photo is much larger than the intended display size, resize a copy before compressing it; reducing quality alone keeps all of those pixels.

Start at quality 80, compress, then compare the reported original and result sizes. Inspect the downloaded image at its intended display size, especially small text and sharp edges. If necessary, lower the quality and compare again using the original selected file, not a previously compressed download.

Choose the smallest result that still looks suitable for its purpose, and keep the original. There is no universal best quality or guaranteed saving: two photos with the same dimensions can produce very different file sizes.

JPG and JPEG are names for the same photographic image format. This tool decodes the source and uses the browser’s native JPEG encoder at your chosen quality, preserving the displayed orientation and decoded width and height.

JPEG compression is lossy, so lower quality can reduce file size by discarding more image detail. Re-encoding an already compressed JPEG cannot restore detail and may not create a smaller file.

Static WebP images are re-encoded with the browser’s native WebP encoder. The tool verifies both encoder support and the returned WebP data instead of silently downloading another format.

WebP transparency is preserved by the canvas encoding path. Animated WebP is intentionally rejected because this lightweight workflow does not preserve animation frames.

The quality slider controls the balance between visual detail and file size for both supported formats. A lower number often produces a smaller result, while a high number may keep more detail but can be larger than the source.

Compression does not resize the image. Each result keeps the exact decoded dimensions. Use Image Resizer separately when reducing pixel dimensions is appropriate for your workflow.

Resize image dimensions before compression

No quality value guarantees a smaller result. Content, source encoder settings, and existing optimization all affect the size. When re-encoding is equal to or larger than the source, the tool marks it as already optimized instead of reporting a compression success.

In that case, Keep original image downloads the original file, not the larger re-encoded candidate. To try for a smaller result, lower the quality and run compression again; review the new result before replacing any original.

PNG uses lossless compression and does not have a standard browser canvas quality control comparable to JPEG or WebP. Pretending the shared quality slider compresses PNG would be misleading.

Keep PNG if your destination requires it or you need lossless pixel data. If your website accepts WebP, PNG to WebP offers adjustable-quality conversion for static PNG images while preserving dimensions and transparency. This changes the format and can lose visual detail; compare the result and file size, and keep your original. Smaller output is not guaranteed.

Convert a static PNG to WebP with transparency