PNG vs JPG vs WebP vs AVIF: Which Format Should You Use?
There is no universally best image format: photographs, interface graphics, archives, and web pages have different requirements.
Read guide →Compress PNG
Re-encode PNG pixels locally, or convert them to a lossy format when a substantial size reduction matters more than lossless storage.
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Reviewed 2026-07-10
About Compress PNG
PNG is lossless, so re-encoding the same pixels does not use the quality slider and may not make an already optimized PNG smaller. The meaningful choice is often whether the image must remain lossless and transparent or can be exported as JPEG, WebP, or AVIF.
The tool performs the pixel round trip in your browser and does not upload the image for processing. Large transparent images can be memory-intensive because every decoded pixel uses four colour-channel bytes before canvas and output overhead.
Supported formats
- PNG
- JPEG
- WebP
- AVIF
How to use it
- Add PNG images. Choose the files and identify which ones require transparency or pixel-exact preservation.
- Select the output. Keep PNG for lossless pixels, or choose WebP, AVIF, or JPEG when their trade-offs suit the destination.
- Check size and appearance. Process the images and verify transparency, text edges, gradients, and output size before replacing any source file.
Useful for
- Re-encode a PNG while discarding attached source metadata.
- Convert a photographic PNG to WebP, AVIF, or JPEG to reduce transfer size.
- Keep a screenshot lossless when crisp text and interface edges matter.
Limitations
- The quality control does not affect PNG output because the PNG encoder is lossless.
- JPEG output cannot preserve transparency; transparent areas may not produce the background appearance you expect.
- Re-encoding is not a specialized PNG palette optimizer and can produce little savings or even a larger file.
Questions and answers
Why did my PNG not get smaller?
It may already be efficiently compressed, and this tool preserves full RGBA pixels rather than quantizing the image to a smaller indexed palette.
Which output keeps transparency?
PNG, WebP, and AVIF support alpha transparency. JPEG does not.
Should screenshots use PNG or JPEG?
PNG usually keeps text and sharp interface edges cleaner. JPEG can be useful for photo-heavy screenshots when a smaller file matters and some artefacts are acceptable.
Related tools
Guides related to Compress PNG
How to Compress Images for the Web Without Visible Quality Loss
The best web-image optimisation combines right-sized pixels with a suitable format and a quality setting tested on real content.
Read guide →AVIF to JPG or PNG: Which Output Should You Choose?
AVIF conversion decodes the image to pixels and rasterizes those pixels into a new JPG or PNG; the right output depends on content and destination.
Read guide →