JPG vs PNG — What's the Difference?

JPG (also written JPEG) and PNG are both raster image formats, but they use fundamentally different compression strategies:

• JPG uses lossy compression. It discards fine detail — especially in areas with smooth colour gradients — to achieve very small file sizes. Every time you save a JPG, some quality is permanently lost.
• PNG uses lossless compression. Every pixel is stored precisely. You can save a PNG hundreds of times and it will always look identical to the original.

This core difference determines when you should use each format.

When Should You Convert JPG to PNG?

There are three main scenarios where switching to PNG makes sense:

1. You need to edit and re-save the image

Every time you save a JPG, the lossy compression runs again and introduces new artefacts on top of old ones. If you plan to crop, resize, add text or apply filters — and then save the result — convert to PNG first. Your edits will be preserved perfectly with no quality decay.

2. You need transparency

JPG does not support transparent pixels. If your workflow requires placing an image on a coloured background and removing the white background, you must use a format that supports transparency. PNG supports full alpha-channel transparency, making it the standard for logos, icons and any graphic that needs to "float" over other content.

3. You're working with graphics, text or screenshots

JPG compression causes visible "ringing" artefacts around sharp edges — exactly the kind found in text, line art and diagrams. PNG's lossless compression keeps these edges razor-sharp. Our Image Compressor can often shrink a PNG screenshot to a very manageable size without any visible quality loss.

What Converting JPG to PNG Does NOT Do

A common misconception: converting JPG to PNG does not improve or restore image quality. The compression damage from the original JPG encoding is baked into the pixel data. Converting to PNG simply wraps that existing pixel data in a lossless container — no recovery happens. Think of it as photocopying a blurry image onto better paper; the paper quality improves but the blur remains.

How to Convert JPG to PNG in Your Browser

The fastest method that keeps your images completely private:

1. Go to the JPG to PNG Converter.
2. Drop your JPG or JPEG file into the upload area, or click to browse.
3. Click Convert to PNG.
4. Review the side-by-side preview and check the file size information.
5. Click Download PNG to save the result.

No file is ever uploaded — the conversion uses the HTML5 Canvas API inside your browser. It's instant, free, and works on any device.

The Right Format for Every Use Case

Use case	Best format	Reason
Photograph on a website	WebP (or JPG fallback)	Smallest file, good quality
Logo or icon	SVG or PNG	Transparency, sharp edges
Screenshot with text	PNG	Lossless — no text artefacts
Image you will edit repeatedly	PNG	No quality loss on re-save
Photo for email attachment	JPG	Smaller file size

How PNG Compression Works

PNG uses a two-stage compression process. First, a prediction filter is applied to each row of pixels — instead of storing absolute colour values, it stores the difference from neighbouring pixels. For images with smooth gradients and large flat areas, these differences are small numbers, which compress very well. Then DEFLATE compression (the same algorithm used in ZIP and gzip) reduces the filtered data further.

This is why PNG is especially good for screenshots, diagrams, and logos — these images have many identical or near-identical pixels adjacent to each other. The prediction filter turns these into long runs of zeros, which DEFLATE compresses extremely efficiently.

For photographs, this advantage disappears. Photographic images have significant variation in every pixel, so the prediction filter provides little gain. JPG's DCT-based compression is purpose-built for this kind of continuous-tone content and achieves much smaller files at acceptable quality.

Reducing PNG File Size After Conversion

PNG files converted from JPG are often large. Several techniques reduce them:

• Use our Image Compressor — reduces PNG file size by 30–60% using advanced optimisation without any visible quality change.
• Convert to WebP instead — if you only need the image for the web and not for editing, WebP lossless is 20–30% smaller than PNG and supported by all modern browsers.
• Reduce colour depth — if the image has fewer than 256 colours (e.g. a logo or simple graphic), saving as PNG-8 (indexed colour) produces a much smaller file than PNG-24.
• Remove metadata — PNG files from design tools often carry colour profile and camera metadata that adds size without affecting visual quality. Our EXIF Metadata Remover strips this data.

File Size: JPG vs PNG

Be aware that PNG files are almost always larger than equivalent JPGs. For a typical 12-megapixel photograph:

• JPG at 85% quality: ~2–3 MB
• PNG: ~8–15 MB

If storage or bandwidth is a concern, consider using WebP instead — it offers lossless compression (like PNG) at much smaller file sizes and supports transparency. For photos where you don't need transparency, JPG remains the most efficient choice.

Related Conversion Guides

• How to Convert PNG to JPG Without Losing Quality — the reverse conversion with quality settings explained
• How to Convert JPG to WebP to Reduce Image File Size — shrink JPGs even further with WebP
• WebP vs PNG vs JPG: Which Format Should You Use? — full format comparison

Frequently Asked Questions

Does converting JPG to PNG improve image quality?

No. The conversion cannot restore detail lost during the original JPG compression. However, PNG prevents further quality loss — subsequent saves will be identical to the converted file.

Why is the PNG file so much larger than the JPG?

PNG stores every pixel precisely (lossless), whereas JPG discards fine detail to achieve smaller files. For photographs, PNG files are typically 2–5× larger than equivalent JPGs.

When should I convert JPG to PNG?

Convert when you need to edit and re-save multiple times without quality loss, when you need a transparent background, or when working with graphics, logos or screenshots where sharp edges matter.

Is there a free way to convert JPG to PNG without uploading my file?

Yes. ToolsBox's JPG to PNG Converter runs entirely in your browser — your image never leaves your device. It's free, instant and requires no account.