PNG to JPG

What is PNG?

PNG (Portable Network Graphics) is a raster image format introduced in 1996 as a modern, patent-free replacement for GIF. PNG uses lossless compression, which means no image data is ever discarded when the file is saved — the decoded image is pixel-perfect and identical to the original. PNG also supports a full alpha channel for transparency, making it the preferred format for icons, logos, UI elements, screenshots, and any graphic that needs a transparent background. PNG is supported by every modern browser and virtually all image software, making it one of the most reliable image formats in existence.

The main drawback of PNG is file size: because it always uses lossless compression, PNG files tend to be significantly larger than other web image formats such as JPG or WebP. This makes PNG less suitable for photographs and large web images where smaller file size matters more than pixel-perfect quality. Converting PNG to JPG is one of the most effective ways to reduce image file size for photographs, web pages, email attachments and other bandwidth-sensitive use cases.

What is JPG?

JPG (also written JPEG, from Joint Photographic Experts Group) is a universally supported image format standard published in 1992. It uses lossy compression based on the discrete cosine transform (DCT) to dramatically reduce file size for photographs and continuous-tone imagery. JPG is the most widely used image format in the world: every modern web browser, operating system, image viewer, office application, social network, and email client can open and display JPG files without any additional software or plugins.

JPG does not support transparency or animation, and its lossy compression introduces generation loss when an image is repeatedly re-encoded. Despite these limitations, JPG remains the default interchange format for photographs and web images because of its near-100% compatibility across devices, applications, and platforms. When you convert PNG to JPG, transparent areas are filled with a solid background colour (white by default) and the resulting file is typically much smaller than the original PNG.

PNG vs JPG comparison

PNG and JPG are the two most widely used image formats on the web, but they were designed for very different purposes. PNG favours perfect quality and transparency through lossless compression, while JPG favours small file size through lossy compression. The table below summarises the key differences between PNG and JPG to help you choose the right format when you convert PNG to JPG.

Feature	PNG	JPG
Year introduced	1996	1992
Compression	Lossless only	Lossy (DCT-based)
Image quality	Always pixel-perfect	Degrades on each re-save
Transparency	Yes (alpha channel)	No
Animation	No (APNG is separate)	No
Typical file size	Large	Significantly smaller
Best for	Logos, icons, screenshots, graphics	Photos, natural images, web
Browser support	Universal	Universal
Software compatibility	Near-universal	Near-universal

In short, PNG wins on lossless quality and transparency, while JPG wins on file size for photographs. Converting from PNG to JPG trades transparency and pixel-perfect quality for a much smaller file that is ideal for photographs, web images, email attachments and bandwidth-sensitive scenarios.

When to use PNG to JPG conversion

Converting PNG to JPG is the right choice in many situations where the smaller file size of JPG outweighs the lossless quality and transparency of PNG. Here are the most common reasons to convert a PNG image to JPG:

• Photographs stored as PNG. Photos saved as PNG are needlessly large. Converting them to JPG can shrink file size by 5–10x with virtually no visible quality loss at high quality settings.
• Website performance. Smaller JPG files load faster, improve Core Web Vitals such as LCP, and reduce bandwidth costs for both servers and visitors.
• Email attachments. Email providers often limit attachment size. JPG's smaller footprint lets you attach more photos without hitting size limits.
• Social media uploads. Most social networks re-encode images as JPG anyway. Uploading a JPG directly avoids an extra lossy conversion and keeps quality under your control.
• Document and office workflows. Word, PowerPoint, Excel and PDF files embed JPG more efficiently than PNG, keeping document sizes manageable.
• Mobile and slow connections. Smaller JPG files are friendlier to metered and cellular data plans, loading quickly on phones and tablets.

Keep your original PNG whenever transparency, sharp text or lossless quality matters — for example logos, icons, UI graphics and screenshots. Use the JPG export for photographs and bandwidth-sensitive scenarios where smaller file size is more important than transparency.

How to convert PNG to JPG

Converting a PNG image to JPG with this tool takes only a few seconds and happens entirely in your browser — no uploads, no sign-up, no watermark. The tool decodes your PNG with the browser's image engine and re-encodes it as JPG through the Canvas API, painting a white background behind any transparent pixels since JPG does not support transparency. Follow these four steps to convert your PNG to JPG:

1. Upload your PNG. Click the upload area or drag and drop a .png file from your computer. The image is decoded locally and shown as a preview.
2. Adjust the JPG quality. Use the quality slider from 10% to 100% to balance file size and visual quality. 90% is a good default for photographs; lower values produce smaller files.
3. Convert to JPG. Click the "Convert to JPG" button. The tool re-encodes the decoded image to JPG via the Canvas API and shows the original and converted file sizes side by side.
4. Download the JPG. Click "Download JPG" to save the converted file to your device. The original PNG remains untouched on your computer.

Because every step runs locally in your browser using JavaScript, your PNG image is never uploaded to a server. This makes the conversion completely private, fast, and suitable for sensitive or confidential images.