What happens to transparency when converting PNG to JPG?

Transparent areas are filled with the background color you choose (default: white). JPG does not support transparency.

How much smaller will the JPG be?

For photographic images, JPG is typically 60-85% smaller than PNG.

PNG to JPG Converter Online Free - Convert PNG Images to JPG

PNG to JPG Converter — Free Online, Reduce File Size

Convert PNG images to JPG format to dramatically reduce file size. Choose a background color for transparent PNGs. Batch convert multiple files at once. No signup, no watermark.

Up to 80% smaller file size Custom background for transparent PNGs Batch conversion + ZIP Files deleted in 5 min

Why Convert PNG to JPG?

PNG files are significantly larger than equivalent JPG files because PNG uses lossless compression that stores every pixel perfectly. A product photograph saved as PNG might be 3–5 MB while the same image in JPG at high quality would be 200–400 KB — an 85–95% file size reduction. For websites, emails and everyday sharing, this size difference matters enormously. Converting PNG to JPG is one of the simplest and most impactful optimisations you can make to your images.

When Should You Convert PNG to JPG?

Not every PNG should become a JPG. The decision depends on what's in the image and how you plan to use it:

Convert PNG to JPG when the image is a photograph. Photos have millions of continuously varying colours that JPG's compression handles very efficiently. A high-quality JPG photograph is visually indistinguishable from a PNG at normal viewing sizes while being a fraction of the file size.
Convert when you need smaller files for email. Many email services limit attachment sizes to 10–25 MB. Converting large PNG photos to JPG often reduces a batch of images from 50 MB to under 5 MB — easily within attachment limits.
Convert for faster website loading. Serving PNG photos instead of JPGs can significantly slow down page load times and hurt Core Web Vitals scores, which affects search engine rankings. Switching to JPG (or better yet, WebP) is a recommended web performance optimisation.
Convert for social media uploads. Most social platforms compress uploaded images anyway. Uploading a pre-compressed JPG often results in better final quality than letting the platform re-compress a large PNG.
Convert for print services. Photo labs and print services typically prefer JPG format for photo prints and usually have file size limits that rule out large PNGs.

When You Should NOT Convert PNG to JPG

If the image has a transparent background that you need to keep — JPG doesn't support transparency. The transparent areas become solid white (or whatever background colour you choose). Use the image as PNG if transparency matters.
If the image contains text, logos or sharp geometric shapes — JPG's compression creates visible artifacts around sharp edges and fine lines. PNG keeps these crisp. Keep logos, icons and diagrams as PNG.
If you plan to do further editing and re-saving — each time a JPG is saved, it re-compresses and loses a little more quality. Keep working files as PNG for lossless editing, and convert to JPG only for the final output.

Handling Transparent Backgrounds

Because JPG doesn't support transparency, this tool fills transparent areas with a solid colour before converting. White is the default and works for the vast majority of cases — your image will appear on a clean white background just as it would on a typical webpage or printed document. If your design uses a different background colour, you can specify a custom hex colour so the transparency blends seamlessly.

Quality Settings Explained

High (92%): The closest to the original PNG quality. At normal screen viewing and standard print sizes, the JPG is visually identical to the PNG. Use this for product images, portfolio work and any image where quality is important.
Medium (82%): The recommended default. Delivers a strong reduction in file size with no perceptible quality difference for general use. Ideal for website images, social media, email and everyday sharing.
Small (70%): Maximum compression. Produces the smallest possible JPG. Use for thumbnails, small preview images, or when bandwidth is severely constrained. Some quality reduction is visible on close inspection.

Getting Even Smaller Files

After converting to JPG, run the file through the Image Compressor for additional optimisation. You can also convert directly to WebP format — WebP produces files 25–35% smaller than JPG at the same visual quality, making it the best choice for modern websites where file size directly impacts performance and user experience.

PNG to JPG — Frequently Asked Questions

JPG does not support transparency. Transparent areas in your PNG are filled with a solid background colour — white by default, which works for most cases. If your image appears on a specific background colour in your design, choose that colour as the background fill so the image blends naturally. If you need to preserve transparency completely, keep the file as PNG.

For photographic images, JPG is typically 80-95% smaller than PNG. For graphics with large areas of flat solid colour (logos, diagrams, illustrations), the size reduction is less dramatic — PNG compresses those types of images very efficiently, so JPG may only be 30-50% smaller or even similar in size.

At High quality (92%), photographic JPGs are visually identical to the original PNG at normal screen viewing sizes and standard print resolutions. Very sharp edges — such as text characters and geometric shapes — may show the slightest compression softening under extreme magnification, but this is imperceptible in normal use.

Yes. Upload multiple PNG files in one batch (up to 80 MB total). Each PNG is converted to its own JPG file. When converting more than one image, all JPG files are bundled into a ZIP archive for convenient one-click downloading.

For modern websites, WebP is better than JPG — it produces files 25-35% smaller at equivalent visual quality and supports transparency. All major browsers have supported WebP since 2020. Use the Image to WebP converter on this site. However, if you need to support older systems or share images outside of a web browser, JPG remains the most universally compatible choice.