Use the image compressor when a browser-supported image needs a JPEG or WebP output with an adjustable quality setting. It retains decoded pixel dimensions and lets you compare original and output sizes. Keep the original, especially when the source is an animation, a transparent asset or an image whose metadata matters.
Establish what the image is for
Decide its display size and the detail the viewer needs. A photograph used as a small card image has different requirements from a scanned diagram with fine labels. Lowering quality can reduce bytes while making edges, text or gradients less useful.
If dimensions also need changing, use the image converter to resize deliberately. Compressing at the same dimensions and reducing pixel dimensions are separate operations; a low quality setting alone does not make a huge source fit its intended display geometry.
Compare formats and quality
Lossless compression preserves the decoded image pixels; lossy compression trades some detail for a different encoding and potentially fewer bytes. This tool's adjustable-quality JPEG and WebP exports should not be treated as a guarantee of lossless output. Judge the result against the detail your task needs, not an absolute promise that no quality is lost.
- Choose an image under 20 MB and 40 megapixels.
- Select WebP or JPEG output.
- Start at 80% quality and compress.
- Compare the reported byte sizes and open the preview.
- Try a lower quality only if the important detail remains useful.
- Download and test the image in its destination application.
A quality value is an encoder input, not a guaranteed visual score or percentage reduction. A result at 80% does not mean 20% of the original bytes were removed. Savings depend on the image, its original encoding and browser implementation.
Check transparency and motion
WebP output can retain transparency. JPEG has no alpha channel, and this compressor fills transparent areas with white for JPEG export. Review transparent logos on a contrasting background so unwanted fills or edge artifacts are visible.
This canvas workflow exports a still image. Animated sources can lose motion, and source metadata can be discarded. Use an animation-specific workflow when all frames are required, and inspect metadata with the metadata checker when those fields matter.
Keep the original when output grows
Already optimized images can produce a larger file after re-encoding. The size comparison reports that case rather than claiming a successful reduction. Keep the original or try a different format and setting if the larger result does not serve another compatibility requirement.
Compression cannot recover detail lost before you received the source. Similarly, converting an already blurry WebP to another format does not restore its sharpness. The WebP to PNG guide explains format conversion for workflows that specifically require PNG.
Processing and device limits
The selected image is decoded and encoded using browser APIs. The compressor does not upload it for processing, although the surrounding website still loads resources and third-party scripts. Large images require device memory; the file and pixel limits help bound that work. If the browser cannot decode or encode a format, use another supported input or output and inspect the result rather than merely changing the extension.