To convert a PNG file to JPEG, a person can use an online converter such as the one available at PictureSize.org, or software such as Free PNG to JPEG Converter that the user can download to his computer. A person can also use an image editor such as Paint.
Free online converters are available at sites such as PictureSize.org and Zamzar.com. The user locates the tool on the site, uploads a copy of the file, adjusts any compression and output settings if available and downloads the converted file when it is ready. Some sites send the converted file as an email attachment, and others provide a link that directs the user to the converted file.
Free software such as Free PNG to JPEG Converter is available at sites such as Download.com and may allow more compression and quality options. These programs essentially work the same way as the online converters. It is a good idea to make a copy of the PNG file before converting it to have a backup in case something goes wrong. JPEG files are compressed, and the quality may be unacceptable after the first conversion, so having a backup allows the user to correct the settings if needed.
To convert a PNG file using an image editor such as Paint, which is usually a free accessory with Windows, or Adobe Photoshop, the user can simply open a copy of the PNG file in the editor and save it as a JPEG.