How to convert a PNG file to JPG on your computer

The fastest way to convert a PNG 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're on either system and want more control over quality and file size, free software like IrfanView (Windows) or GIMP (Mac and Windows) gives you options.

The core difference: PNG files support transparent backgrounds; JPG files do not. When you convert, that transparency becomes a solid color—usually white. If your image has no transparency, the conversion is straightforward. If it does, you'll need to decide what color fills that space.

Key Takeaways

  • Windows Photos app and Mac Preview both convert PNG to JPG without installing anything, though the steps differ between systems.
  • JPG compression reduces file size but can blur fine details; PNG keeps sharpness but creates larger files.
  • Transparent areas in a PNG become solid color (usually white) when converted to JPG.
  • Batch conversion tools let you change multiple files at once, which saves time if you have dozens of images.
  • Online converters work from any device but upload your image to someone else's server, which matters if the image is private.

Converting on Windows using Photos or Paint

Photos app method: Open the PNG file in Photos. Click the three dots in the top right, then select "Edit." In the top menu, click "Save as" and choose JPG from the file type dropdown. Name the file and pick a folder. Click Save. The app creates a new JPG file; your original PNG stays unchanged.

Paint method: Right-click the PNG file, select "Open with," and choose Paint. Go to File menu, then "Save as." In the dropdown that says "PNG picture," change it to "JPEG picture." Name the file and click Save. Paint will ask if you want to keep the PNG format or switch to JPEG—choose JPEG.

Both methods are free and built into Windows. Neither gives you control over compression quality, so the JPG file size depends on Windows' default settings. If you need smaller files or want to adjust quality, use a dedicated tool instead.

Converting on Mac using Preview

Open the PNG file in Preview (it's in Applications > Utilities, or search for it with Spotlight). Go to File menu and click "Export." In the dialog that opens, change the file format dropdown from PNG to JPEG. You'll see a Quality slider—drag it left for smaller files (lower quality) or right for larger files (higher quality). Name the file and click Save.

Preview's quality slider gives you control that the Windows built-in tools don't offer. A quality setting around 75–80 percent usually balances file size and image sharpness for photos. For images with text or fine lines, use 85 percent or higher.

Using free software for batch conversion or advanced control

IrfanView (Windows): Download and install it, then open the PNG file. Go to File > Export as JPEG. A dialog opens where you can set quality (1–100), choose what color fills transparent areas, and adjust other settings. Click Export and name the file. To convert many files at once, use File > Batch Conversion, select all your PNGs, and set the output format to JPEG.

GIMP (Mac and Windows): Open the PNG file. Go to File > Export As. Change the filename extension from .png to .jpg. Click Export. A dialog appears with quality and compression options. Adjust as needed and click Export again. GIMP is more complex than IrfanView but offers finer control over how the image looks after conversion.

Both tools are free and open-source. IrfanView is lighter and faster; GIMP is more powerful but takes longer to learn. For a single file, the built-in tools are usually enough. For dozens of files, batch conversion saves hours of clicking.

Understanding PNG to JPG trade-offs

PNG uses lossless compression, meaning no image data is thrown away—the file is just packed efficiently. JPG uses lossy compression, which discards some data to make the file smaller. A PNG photo might be 5 MB; the same photo as JPG might be 500 KB. The JPG looks nearly identical to most eyes, but if you zoom in or print it very large, you may see blurriness or color banding.

JPG is better for photographs and complex images with many colors. PNG is better for graphics, logos, screenshots, and anything with text or sharp edges. If your PNG has a transparent background and you convert it to JPG, that transparency becomes solid color. You can't get it back by converting the JPG back to PNG—the information is gone.

Choose your quality setting based on what the image is for. A photo for email or social media can be quality 70–75. A photo you might print or edit later should be 85–90. Logos and text should be 90 or higher, or stay as PNG.

Converting online without installing software

Websites like CloudConvert, Convertio, and Online-Convert let you upload a PNG and download it as JPG without installing anything. Upload the file, adjust quality if the site offers it, and click Convert. The JPG downloads to your computer.

Online converters are useful if you're on a borrowed computer or a Chromebook, or if you don't want to install software. The trade-off: your image goes to someone else's server. If the image contains personal information, medical records, or anything sensitive, use a tool on your own computer instead. Most online converters delete files after a few hours, but you're trusting their privacy policy.

Frequently Asked Questions

Will the JPG look exactly like the PNG?

For photographs, yes—the difference is invisible to the human eye at quality 80 or higher. For images with text, sharp lines, or logos, you may see slight blurriness at lower quality settings. If sharpness matters, use quality 90 or keep the file as PNG.

Can I convert a JPG back to PNG and get the original quality?

No. Once JPG compression discards data, it's gone. Converting JPG to PNG just changes the container; it doesn't restore what was lost. Always keep your original PNG if you might need it later.

What happens to the transparent background?

It becomes a solid color, usually white. Some tools let you choose the color before converting. Once converted, you can't make it transparent again without editing the JPG in software like GIMP or Photoshop.

How do I convert many files at once?

Use batch conversion in IrfanView (Windows) or a command-line tool like ImageMagick (advanced users). Online sites like CloudConvert also accept multiple files, though uploading dozens of large images can be slow.

Which format should I use for my website?

JPG for photographs and complex images, PNG for logos and graphics with transparency. Modern browsers also support WebP, which is smaller than both, but not all older browsers recognize it. For maximum compatibility, JPG and PNG are the safest choices.