Image Converter
JPG, PNG and WebP — with resizing
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When to convert, and to what
The three formats are not competing — each has a job, and the right conversion depends on the kind of image rather than personal preference.
WebP — the default for websites
25–35% smaller than JPG at the same perceived quality, and it supports transparency too. Every modern browser handles it, including Safari since 2020. Unless you must support decade-old browsers, this is almost always the choice.
JPG — photographs, everywhere
Supported by every piece of software that exists, including old programs, printers and non-browser systems. No transparency. If the image is going into an email, to a printer or into an external system, JPG is the safe bet.
PNG — only when you need transparency
Lossless compression, so files are substantially larger. Keep it for logos, icons and screenshots with a transparent background. Converting a photograph to PNG almost always produces a file several times larger with no gain in quality.
What happens to transparency?
Converting to JPG removes transparency — the tool fills transparent areas with white, which is the expected result in most cases. If you need to keep transparency, choose WebP or PNG. After converting, it is worth compressing too if the weight is still high.
Frequently asked questions
What is the difference between converting and compressing?
Compression shrinks the file within the same format. Conversion changes the format itself, and that is usually where the big saving is. A photograph saved as PNG can drop 90 percent just by moving to WebP, without touching quality. This tool does both in one pass, and you can also compress only.
Which format should I use for a website?
WebP, almost always. It is 25–35% smaller than JPG at the same perceived quality, supports transparency, and every modern browser displays it including Safari since 2020. JPG remains the choice when the image leaves your site — for email, print or an external system.
What happens to transparency when converting to JPG?
It is lost. JPG has no alpha channel, so the tool fills transparent areas with white — the expected result in most cases, and better than the black background some tools produce. If transparency matters, choose WebP or PNG.
Why is the quality slider disabled for PNG?
Because PNG is lossless — there is no quality dial to turn. Its size comes from the content itself: how many colours there are and how much they repeat. That is also why a photograph saved as PNG will always be large.
Are my files uploaded to a server?
No. Conversion runs in your browser through the Canvas API. You can disconnect from the internet after the page loads and it keeps working. There is no size or quantity limit, because there is no bandwidth for anyone to pay for.
Why did my converted file come out larger?
That happens when you convert an already well-compressed image into a less efficient format, such as a small JPG becoming a PNG. It also happens when you raise quality above the original — compression cannot restore lost detail, it only adds weight. The tool shows both sizes so you see it immediately.
