JPG vs PNG: What's the Difference?

By Data Conversion Center  ·  Updated February 2026  ·  9 min read

JPG and PNG are the two most widely used image formats on the web. They account for the vast majority of images on every website, design tool, and device. Yet they work in completely opposite ways — and choosing the wrong one costs you either unnecessary file size or unnecessary quality loss.

The Core Difference: Lossy vs Lossless Compression

JPG uses lossy compression. When you save a JPG, the encoder permanently discards image data it considers invisible to the human eye — primarily high-frequency detail in areas of gradual color change. Each time you open a JPG, edit it, and save it again, another round of lossy compression is applied and more data is lost. This is called generation loss.

PNG uses lossless compression. Every pixel is preserved exactly. Open a PNG, edit it, save it a thousand times — the pixel data is identical to the original. No generation loss ever.

JPG vs PNG: Full Comparison Table

When to Use JPG

• Photographs. Photos have millions of subtly different colors with gradual transitions — exactly the content where lossy compression is invisible. A photograph saved as JPG at 85% quality looks identical to a PNG but is 5–10× smaller.
• File size is a priority. For web pages where load speed matters, JPG photos load dramatically faster than PNG equivalents. This directly affects Core Web Vitals scores.
• Transparency isn't needed. If the image sits on a solid background and never needs a transparent background, there is no reason to pay the PNG file size penalty.
• Social media and email. Most platforms recompress uploaded images anyway. JPG gives predictable results; large PNGs often get aggressively recompressed by the platform.
• Camera exports for sharing. PNG versions of camera photos would be enormous and impractical for sharing or storage.

When to Use PNG

• Transparency is required. Product images on white backgrounds, logos over colored headers, UI elements that overlay content — any image needing a transparent background requires PNG (or WebP). JPG cannot do this.
• The image contains text, lines, or sharp edges. JPG compression creates visible blurring and color fringing around sharp edges. Screenshots, diagrams, and any image with text are noticeably sharper in PNG.
• You're editing and re-saving the file. Use PNG as your working format. Work in PNG and only export to JPG for the final public version.
• Logos and brand assets. Logos need to look perfect at any size and on any background. PNG delivers both pixel accuracy and transparency support.
• Screenshots. Screenshots always contain text and UI elements with sharp edges. A JPG screenshot shows compression artifacts around text — PNG does not.
• Images with flat areas of solid color. Icons and graphics with large areas of identical pixels can compress more efficiently as PNG than JPG.

File Size: Real Numbers

For photographic content, JPG wins on file size by a wide margin. For flat graphics, text-heavy images, and screenshots, PNG can be smaller because repetitive pixel data compresses well losslessly. Use the Image Compressor to further reduce file sizes, and the Image Resizer to trim dimensions first.

What JPG Actually Loses

JPG compression divides an image into 8×8 pixel blocks and discards coefficients representing fine detail. In practice:

• Soft gradients (sky, skin, blurred backgrounds) reproduce excellently at JPG 80%+. The human eye cannot tell the difference.
• Sharp edges develop "ringing" — a faint halo of contrasting pixels. Most visible around text, window borders, and icons.
• Flat areas of color can develop "blockiness" — the 8×8 block structure becomes visible as slight tonal variations.
• Colors can shift slightly — JPG compresses chroma more aggressively than luminance, causing subtle inaccuracies in logos and brand colors.

At quality 85–95% these artifacts are invisible in photographs. They become noticeable below 70% quality and are always visible in screenshots and text-heavy images at any quality setting.

Transparency Support

This is a hard technical limitation — not a quality tradeoff. JPG cannot store any transparency information. When a transparent PNG is saved as JPG, all transparent pixels are filled with a solid color permanently. Once saved as JPG, the transparency data is gone.

PNG supports a full alpha channel — each pixel can have a transparency value from 0 (fully transparent) to 255 (fully opaque), enabling smooth semi-transparent edges, drop shadows, and glass effects. This is why PNG is the standard for logos, cutout product images, and UI graphics.

For transparency with smaller file sizes, converting to WebP gives you full alpha channel support with files smaller than PNG.

Converting Between JPG and PNG

JPG → PNG: Converting a JPG to PNG does not recover quality lost during original JPG compression. The PNG will be larger but look identical to the JPG. The benefit: future edits won't cause additional quality loss. Use the free JPG to PNG Converter.

PNG → JPG: Applying lossy compression for the first time reduces file size substantially. For logos and screenshots this introduces visible artifacts. Use the PNG to JPG Converter at quality 85%+.

For web use, consider converting to WebP — better compression than JPG, transparency support like PNG, and 95%+ browser coverage in 2026.

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