Convert PNG to JPG — Free PNG to JPG Converter

How to Convert PNG to JPG

Why Convert PNG to JPG?

PNG files are excellent for graphics and screenshots, but they create unnecessarily large files when used for photographs. Converting PNG photos to JPG typically reduces file size by 60–80% while maintaining visual quality that is virtually indistinguishable from the original. This makes images faster to upload, easier to share by email, and lighter on storage.

JPG uses lossy compression optimized for photographic content. Colors blend naturally and fine details are preserved at quality settings above 80. If your image has no transparency and is not a screenshot or line art, JPG is almost always the better choice for file size.

With LeanImg, your images never leave your device — conversion happens entirely in your browser. There is no server upload, no waiting for a round trip, and no privacy risk. Drop your files and download the result in seconds.

After converting, compress your JPG to squeeze out even more savings. Working with modern formats? Try PNG to WebP for the best of both worlds.

Compress your JPG · PNG to WebP

What changes going from PNG to JPG

The converter reads the PNG into raw pixels and blends every partially transparent pixel against white in proportion to its alpha before MozJPEG encodes it at quality 85, unless you move the slider. That blending step decides how a cut-out looks afterwards. Anti-aliased edges pick up a thin white fringe, and a soft drop shadow becomes a gray smudge on a white field. Fully opaque PNGs skip that stage untouched.

Two things leave the file for good. PNG text chunks, an embedded color profile and any other metadata don't carry across, because the encoder only ever sees pixels, so the output is an untagged image that viewers treat as sRGB. A 16-bit PNG also drops to 8 bits per channel on the way through the browser's canvas. The JPEG that comes out is progressive, so on a slow connection it paints a blurry full frame first and sharpens as the rest loads.

Photographs and anything with gradients shrink the most. Flat-color graphics shrink far less and start to show ringing around hard edges, especially where colored text sits on a plain background. Compatibility is a wash, since every browser and every app has opened both formats for decades, so file size is the only reason to make this trip. Don't do it to a screenshot you'll need to read closely, or to a file you'll keep editing and re-saving, because each JPEG save loses a little more. If you only need a smaller PNG, run it through the compressor instead and keep the alpha channel intact.

PNG vs JPG

What is a JPG file?

JPEG is the photographic standard the Joint Photographic Experts Group published in 1992, as ISO/IEC 10918-1 and ITU-T T.81. It cuts the image into 8x8 blocks, runs a discrete cosine transform over each one, then discards the coefficients your eye is least likely to miss — and almost every encoder throws away three quarters of the color resolution first, which is why colored text and thin diagram lines suffer. No JPEG mode has an alpha channel, so transparency has to be flattened onto a solid color.

How to open a JPG file

Every operating system opens a JPEG with no help at all: Preview, Photos and Quick Look on macOS, Photos and Paint on Windows, GIMP or Eye of GNOME on Linux, and every browser on every platform renders a .jpg inline. For scripted work, libjpeg-turbo ships cjpeg, djpeg and jpegtran, and jpegtran can rotate or crop without re-encoding on 8 pixel boundaries.

Convert other formats to JPG

Convert PNG to other formats

• PNG to WebP
• PNG to AVIF
• PNG to PDF

Frequently Asked Questions