JPG and PNG FAQ: Answers to the Most Common Questions

They are identical. JPG and JPEG refer to the exact same file format. The difference in name comes from early Windows systems that limited file extensions to three characters, shortening .jpeg to .jpg. Both extensions work the same way on all modern systems.

Yes. JPG uses lossy compression, which permanently removes some image data each time the file is saved. The quality loss is controlled by the quality setting — at high settings (85+) the loss is imperceptible, but it is cumulative. Every time you open and re-save a JPG, it loses a little more quality. For files you'll edit repeatedly, work in PNG and only export to JPG as the final step.

No. Once image data is removed by lossy compression, it cannot be recovered. Converting a low-quality JPG to PNG gives you a larger file with the same quality — the compression artifacts from the original JPG are permanently baked in. Always keep your original high-quality files as backups.

JPG does not support transparency. Any transparent areas in the original file were filled with white (or another background color) when saved as JPG. To preserve transparency, use PNG or WebP instead.

For web use: 70–85 is the standard range. Below 70 you'll typically see visible artifacts; above 85 the file size savings become marginal. For print or archiving: 90–95 preserves more detail. For thumbnails and previews where file size matters most: 60–70 is acceptable.

JPG compression creates artifacts around high-contrast edges — exactly the type of content logos contain. This is a fundamental limitation of JPG for graphics with sharp edges. Use PNG or SVG for logos instead of JPG.

Yes, for photographs. JPG's small file sizes load faster and improve page performance. For logos, icons, and graphics with text, use PNG or SVG instead. For the best web performance, consider converting JPG photos to WebP.

The JPG standard supports images up to 65,535 × 65,535 pixels. In practice, file size and processing limits are the real constraints long before you reach technical maximums.

PNG stands for Portable Network Graphics. It was developed in 1995 as an improved, patent-free alternative to the GIF format.

No. PNG uses lossless compression — image data is compressed without any permanent loss. Open a PNG, save it a hundred times, and it looks identical to the original every time. This makes PNG ideal for images that go through multiple rounds of editing.

PNG retains all image data through lossless compression. For photographs with millions of subtle color variations, this produces large files because every pixel's exact color is preserved. JPG discards subtle visual data the eye doesn't notice to achieve much smaller sizes. For photos, JPG is almost always more efficient. PNG's advantage is quality preservation and transparency support.

Yes. PNG supports full alpha channel transparency — each pixel can be anywhere from fully transparent to fully opaque, with smooth gradients in between. This makes PNG the standard format for logos, icons, and graphics that need to sit on different backgrounds.

Yes, for logos, icons, screenshots, and graphics with transparency. For photographs, JPG or WebP produce much smaller files with similar visual quality. Large PNG photos slow down page loading — use JPG or WebP for photographic content.

There is a format called APNG (Animated PNG) that supports animation, but it's not universally supported across all browsers and platforms. For web animation, GIF or WebP animated are more practical choices.

A PNG exported at 1× resolution appears soft on 2× (Retina) displays because there aren't enough pixels. Export at 2× (double the display size) for sharp Retina display rendering. For logos and icons, SVG is a better choice as it scales perfectly at any resolution automatically.

Use PNG when: the image needs a transparent background, the image contains text or sharp graphics, you need to preserve perfect quality through multiple editing rounds, or the image is a logo, icon, or screenshot. Use JPG when: the image is a photograph, you need a small file size for web delivery, or you're sharing photos where transparency isn't needed.

Neither is universally better — they serve different purposes. JPG is better for photographs and small file sizes. PNG is better for graphics, transparency, and lossless quality. The right choice depends on the image content and how you plan to use it.

No. Converting a compressed JPG to PNG stores the existing image data losslessly but cannot recover quality lost in the original compression. You get a larger file with the same quality. The benefit of converting JPG to PNG is stopping further quality loss during subsequent edits.

Google recommends WebP for web images as it's smaller than both JPG and PNG at equivalent quality. For maximum compatibility, JPG for photos and PNG for graphics remain the safe standards. Google fully indexes both formats.

Yes, and most websites do. JPG for photographic content, PNG for logos and graphics, SVG for icons. Using the right format for each image type optimizes both quality and performance.