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Guide
About the Image Compressor
Large images are the most common cause of slow web pages. Compressing and resizing them before upload cuts load times, saves bandwidth, and improves Core Web Vitals — all without a visible drop in quality when done right. This tool re-encodes an image at a quality level you choose, optionally resizes it, and lets you convert between WebP, JPEG, and PNG, showing exactly how many bytes you saved.
It runs entirely in your browser using the Canvas API, so even large or private images are processed on your device and never uploaded anywhere.
Which format to choose
- WebP — the best all-rounder for the web; smaller than JPEG and PNG at similar quality, with wide browser support.
- JPEG — great for photographs where some lossy compression is invisible.
- PNG — lossless, best for graphics with sharp edges or transparency, but larger. Resizing helps most here.
Quality vs. file size
Lossy formats let you trade quality for size. In practice, you can often drop the quality setting well below 100% before any difference is visible, while the file shrinks dramatically. Resizing has an even bigger impact: serving an image at the dimensions it's actually displayed — rather than a huge original — is one of the simplest, highest-impact optimizations you can make.
How to use it
- 1Drop in a PNG, JPEG, or WebP image.
- 2Choose the output format and adjust the quality.
- 3Optionally resize to the dimensions you actually need.
- 4Check the size saved, then download the compressed image.
Frequently asked questions
Which format gives the smallest file?
WebP is usually smallest for the web at a given quality, beating both JPEG and PNG. Use JPEG for photos when WebP is not an option, and PNG only when you need lossless quality or transparency.
Will compressing ruin the image quality?
Not if done carefully. You can often lower quality noticeably before any visible difference appears, and the preview lets you check before downloading.
Does resizing help more than quality?
Often yes. Serving an image at its actual display size, instead of a much larger original, typically saves the most bytes.
Can I convert a PNG to WebP or JPEG here?
Yes. Choose the output format and the tool re-encodes the image accordingly.
Are my images uploaded?
No. Compression uses the browser Canvas API, so images are processed locally and never sent to a server.