How to convert PNG to JPG on your computer

The fastest way to convert a PNG file to JPG depends on what device you're using. On Windows, you can use the built-in Photos app or Paint. On Mac, Preview handles the conversion in two steps. If you don't want to install anything, online converters work in your web browser without downloading software.

The reason to convert matters: JPG files are smaller than PNG files, which saves storage space and makes images faster to upload or email. PNG keeps a transparent background; JPG fills transparency with a solid color (usually white). If your image has a transparent background you need to keep, conversion to JPG will lose that.

Key Takeaways

  • Windows Photos app and Paint both convert PNG to JPG by opening the file and using "Save as" with JPG selected as the format.
  • Mac users open the PNG in Preview, click File, then choose Export and select JPEG from the format dropdown.
  • Online converters like CloudConvert, Zamzar, or Convertio work on any device with a browser and don't require software installation.
  • JPG files are smaller than PNG but lose transparency, so only convert if file size matters more than a transparent background.
  • Batch converters exist for converting many files at once, but single-file conversion takes under a minute on any method.

Converting PNG to JPG on Windows using Photos or Paint

Open the PNG file in the Photos app by right-clicking it, selecting "Open with," and choosing Photos. Once the image is open, click the three-dot menu in the top right corner and select "Edit." Then click the three-dot menu again and choose "Save as." A dialog box appears asking where to save the file and what format to use. Change the filename if you want, then click the dropdown that says "PNG" and select "JPEG." Click "Save" and the conversion is complete.

If Photos doesn't work or you prefer Paint, right-click the PNG file and select "Open with" and then "Paint." Once the image opens, click "File" in the top left, then "Save as," and a dialog appears. Select "JPEG Picture" from the "Save as type" dropdown, name your file, and click "Save." Paint will ask if you want to keep the PNG or save as JPEG—select JPEG to complete the conversion.

Converting PNG to JPG on Mac using Preview

Open the PNG file in Preview, which is the default image viewer on Mac. Click "File" in the menu bar at the top, then select "Export." A save dialog opens with format options. Click the dropdown that says "PNG" and change it to "JPEG." You can adjust the quality slider if you want—higher quality means a larger file size. Name the file and click "Save" to finish.

If you want to replace the original PNG file with the JPG version, you can delete the PNG after confirming the JPG saved correctly. If you want to keep both versions, give the JPG a different name so you don't overwrite anything by accident.

Using online converters for PNG to JPG conversion

Online converters work on any computer or phone without installing software. Go to a converter website like CloudConvert, Zamzar, or Convertio. Click the button to upload or select your PNG file from your computer. The website automatically detects that it's PNG and usually defaults to JPG as the output format. If not, click the format dropdown and select JPEG. Click "Convert" and wait a few seconds to a minute depending on file size and internet speed. Download the converted JPG file to your computer.

Online converters are useful if you're on a shared computer, a Chromebook, or a phone where you can't install software. The trade-off is that your image is uploaded to someone else's server, so don't use this method for private or sensitive images. Most reputable converters delete files after a few hours, but read their privacy policy if you're concerned.

Understanding file size and quality when converting

JPG files are typically 50 to 80 percent smaller than PNG files of the same image, which is why conversion is useful for email, web uploads, or storage. The smaller size comes from JPG's compression method, which removes some image detail that the human eye usually can't see. For photographs and complex images, this loss is invisible. For images with sharp text, thin lines, or solid colors, the loss may be noticeable.

PNG preserves every pixel exactly as it is, which is why PNG files are larger. PNG also supports transparency—areas of the image can be see-through. JPG does not support transparency and will fill transparent areas with a solid color, usually white or whatever background color you set. If your PNG has a transparent background and you need to keep it, do not convert to JPG.

Converting multiple PNG files to JPG at once

If you have many PNG files to convert, doing them one at a time takes too long. Windows users can use free batch conversion software like XnConvert or IrfanView, which let you select a folder of PNG files and convert them all to JPG in one operation. Mac users can use Automator, which comes built into macOS, to create a workflow that converts multiple files. Online batch converters like CloudConvert also handle multiple files if you upload them together.

Batch conversion is worth learning if you regularly convert image formats. For a one-time conversion of a few files, the single-file methods above are faster to set up and use.

Checking your converted JPG file

After conversion, open the JPG file to make sure it looks correct. Check that colors appear right, text is readable if the image contains text, and the file size is actually smaller than the original PNG. If the JPG looks blurry or has visible compression artifacts (blocky areas or color banding), you can reconvert with higher quality settings. Most converters have a quality slider—moving it higher produces a better-looking image but a larger file.

Keep the original PNG file until you're certain the JPG meets your needs. Once you're satisfied, you can delete the PNG to free up storage space. If you're uploading to a website or email, test the JPG on that platform to confirm it displays correctly before deleting the original.

Frequently Asked Questions

Will converting PNG to JPG make my image blurry?

Not noticeably for photographs. JPG compression removes detail the human eye usually can't see. For images with sharp text, thin lines, or solid colors, some blurriness may appear. If this happens, you can reconvert with a higher quality setting, which increases file size but improves appearance.

Can I convert JPG back to PNG?

Yes, using the same methods—Photos, Paint, Preview, or online converters. The converted PNG will be the same size as the JPG, not the original PNG, because the detail lost during JPG compression cannot be recovered. Converting back and forth repeatedly degrades image quality.

What if my PNG has a transparent background?

JPG does not support transparency. When you convert, the transparent areas will fill with a solid color, usually white. If you need to keep the transparent background, do not convert to JPG. Keep the file as PNG or convert to another format that supports transparency, like GIF or WebP.

Is it safe to use online converters?

Reputable converters like CloudConvert and Zamzar are safe for non-sensitive images. They typically delete uploaded files after a few hours. For private, confidential, or sensitive images, use a desktop converter instead so the file stays on your computer.

How much smaller will my JPG file be?

JPG files are typically 50 to 80 percent smaller than PNG files of the same image, though this varies depending on the image content. Photographs compress well; images with solid colors or text compress less. The only way to know for certain is to convert and compare file sizes.