Quick answer: Converting an image changes the file format: JPG for photographs, PNG for graphics and transparency, and WebP for smaller files on the web. JPG cannot store transparency, so transparent areas become white when you convert a PNG to JPG. Everything happens in your browser and nothing is uploaded.
Sometimes a website or program will not accept the type of image you have. A form wants a JPG and you have a PNG, or a design tool cannot open a WebP file. This converter changes the format for one image or many in a few clicks, without uploading anything.
Choose the type you want, drop your files in, and download each converted image. For JPG and WebP you can also set the quality, which lets you trade file size against detail.
Which format should I choose?
- JPG is best for photographs. It makes small files and works everywhere, but it cannot store transparency, so transparent areas become white.
- PNG is best for logos, screenshots and graphics with sharp edges or transparency. It is lossless, so files are larger.
- WebP makes files that are typically 25 to 35% smaller than JPG at similar quality, and supports transparency. Modern browsers and apps open it, though a few older programs cannot.
Converting from a lossy format (JPG) to PNG does not bring back detail that was already lost, it just stores the same picture in a lossless container, so the file gets larger. If your browser cannot create WebP files, the tool tells you and makes a PNG instead.
A worked example
Example. A PNG screenshot that is 2.1 MB is often under 300 KB as a JPEG or WebP, because those formats are designed for photos. Going the other way, WebP to PNG is useful for programs that cannot open WebP files.
Which conversion should I use?
| From | To | What to expect |
|---|---|---|
| PNG screenshot | JPG or WebP | Much smaller file, small loss of sharp edges |
| JPG photo | PNG | Larger file, no gain in quality |
| PNG with transparency | JPG | Transparent areas become white |
| WebP | JPG or PNG | Opens in older programs |
| JPG or PNG | WebP | Usually smaller at similar quality |
A quick guide to the effect of each conversion.
Common mistakes to avoid
- Converting JPG to PNG to “improve quality”. Lost detail does not come back, and the file just gets larger.
- Converting a transparent PNG to JPG and expecting the background to stay clear. It turns white, so keep PNG or WebP if you need transparency.
- Assuming every program can open WebP. Modern browsers can, but some older software cannot, so convert to JPG or PNG for those.
Go deeper: read our guide How to Compress Images for Your Website.
Frequently asked questions
How do I convert PNG to JPG?
Choose JPG as the format, drop your PNG file in, and press Download. If the PNG has transparency, those areas become white, because JPG has no transparency.
Will converting reduce the quality?
Converting to JPG or WebP is lossy, so quality can drop slightly, especially at low quality settings. Converting to PNG is lossless. Use a quality of 90% or more to keep JPG and WebP looking the same.
Are my files uploaded?
No. Converting happens in your browser, and your images never leave your device.
Can it open HEIC photos from an iPhone?
Only if your browser can display them. Safari on Apple devices usually can. Most other browsers cannot open HEIC, and the tool will say it cannot read the file.
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Sources and further reading
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