What happens to transparency when converting PNG to JPG?

JPEG cannot represent transparent pixels. When converting a PNG with transparency, any alpha less than 1 pixels are composited against a solid background (white). If your image relies on transparency, convert to WebP instead or keep it as PNG.

When should I use JPG instead of PNG?

Use JPG for photographs, web hero/banner images, email attachments, social media uploads, and print at typical resolutions. JPG produces 60–85% smaller files than PNG for photographs.

What JPEG quality setting is best?

Quality 0.85–0.92 is the sweet spot for web JPGs. Past 0.92 file size grows rapidly with little visible gain. Below 0.75 compression artefacts become visible. 0.90 is a sensible default.

PNG to JPG Converter — Free Online Image Converter

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What Is PNG to JPG Conversion?

PNG to JPG conversion re-encodes an image from the lossless PNG format into the lossy JPEG (JPG) format. The result is a much smaller file — typically 60–90% smaller for photographs — at the cost of slight, usually invisible compression artefacts. JPEG does not support transparency, so any transparent pixels in the source PNG are flattened against a solid background (white by default). Use PNG to JPG conversion when you need smaller file sizes for the web, email, or social media, and you don't need transparency.

PNG to JPG Converter Online — What This Tool Does

This free PNG to JPG converter takes any PNG image and re-encodes it as a JPEG file entirely in your browser. Set a quality level from 1–100, see the original and converted file sizes side by side, and download the result. No upload, no watermark, no account needed.

How to Convert PNG to JPG

Drag a PNG file onto the upload zone, or click to pick one from your computer.
Adjust the Quality slider — 0.9 (90%) is a sensible default.
The tool re-encodes the image via the HTML <canvas> API.
Compare the original PNG size vs the converted JPG size. Typical savings: 60–85%.
Click Download to save the converted .jpg file.

When to Use JPG Instead of PNG

Photographs — JPG was designed for natural images with smooth colour gradients.
Web hero / banner images — smaller file size helps Core Web Vitals.
Email attachments — fits within mail-server size limits more easily.
Social media uploads — most platforms convert to JPG anyway; doing it yourself first gives you control.
Print at typical resolutions — JPG at quality 90+ is indistinguishable from PNG for photographic output.

What About Transparency?

JPEG cannot represent transparent pixels. When this tool converts a PNG with transparency, any alpha < 1 pixels are composited against a solid background (white). If your image relies on transparency — for example a logo on a coloured background — convert it to WebP instead, or keep it as PNG and compress with our Image Compressor.

JPG vs PNG — Which Should I Use?

Use JPG for photographs and any image with many colours and no transparency. Use PNG for logos, icons, screenshots, line art, and anything that needs sharp edges or transparency. PNG is lossless — repeated saves do not degrade quality — making it the right choice for source files you'll edit again. JPG re-saves lose quality each generation.

Tips & Tricks

Quality 0.85–0.92 is the sweet spot for web JPGs — past 0.92 file size grows rapidly with little visible gain.
Resize before converting — a 4K image scaled to 1920px first will compress dramatically better. Use the Image Resizer.
Check transparency first — if your PNG has a transparent background, decide what colour you want behind it before converting.
WebP is even smaller — for modern browsers, WebP beats JPG at the same quality. Use WebP Converter.

Related Tools

JPG to PNG Converter — convert in the opposite direction
Image Compressor — reduce file size further at the same format
Image Resizer — change dimensions before or after converting
WebP Converter — convert to Google's modern WebP format
SVG to PNG Converter — rasterise SVGs to PNG first, then convert if needed

Is My Image Sent to a Server?

No. PNG to JPG conversion runs entirely in your browser using the HTML <canvas> API. Your image is loaded as a local object URL, drawn to a canvas, and re-encoded as JPEG — all without ever touching our servers. The converted file appears as a download from your own browser.