Are my images uploaded anywhere during conversion?

No, conversion runs entirely in your browser via the canvas API. Your PNG file is decoded and re-encoded locally with no network requests.

What happens to the transparent areas in my PNG?

JPEG cannot store transparency, so the tool fills the background with white before encoding. If you need to preserve transparency, convert to WebP instead.

What quality level should I pick?

For photographs, 80-90 is the sweet spot for invisible quality loss with strong file-size savings. For UI screenshots or logos, JPEG may show artifacts at any quality — WebP is a better choice.

How much smaller will the JPG be than the PNG?

For photographs the JPG is typically 5-20x smaller than the PNG at quality 85. For graphics with sharp edges the savings are smaller and the artifacts more visible.

Will repeated PNG-to-JPG conversions degrade the image?

Yes, because JPEG is lossy. Always convert from the original PNG, not from a previously-converted JPG, to avoid stacking compression artifacts.

PNG to JPG Converter

Convert PNG to JPG with adjustable quality — entirely local in your browser.

Written by Golam Rabbani, Founder & Lead Engineer

This interactive tool requires JavaScript. Read the formula and worked example below; you can compute the result by hand.

How to use this png to jpg converter

Choose a PNG file from your device.
Drag the quality slider to balance JPEG file size against visual fidelity (90 is a safe default).
Press "Convert to JPG" — the tool flattens transparency against white and encodes the result.
Preview the JPG output and check the file size in the result box.
Click "Download JPG" to save the converted file locally.

About this png to jpg converter

A PNG-to-JPG converter re-encodes a lossless PNG into the smaller, lossy JPEG format. PNG is great for screenshots and graphics with sharp edges; JPEG is much better for photographs because its DCT-based compression discards detail the eye barely sees and shrinks files dramatically — often by 10x or more for the same visual quality.

This tool decodes the PNG with the browser's createImageBitmap, draws it onto a canvas, and uses canvas.toBlob with mimeType 'image/jpeg' at your chosen quality. Because JPEG has no alpha channel, the canvas is first filled white so transparent pixels do not become black. Everything happens locally in your browser — no upload, no server, your file is never transmitted.

As a worked example, a 4.2 MB PNG photograph re-encoded as JPEG at quality 85 typically lands around 280 KB — a 15x reduction with no visible quality loss on a typical screen. Drop the slider to quality 70 and the same photo can fall under 180 KB, still acceptable for blog uploads and product galleries.

The trade-off is sharpness on text and crisp edges. If your PNG is a screenshot of a UI or a logo with hard edges, JPEG will introduce visible ringing artifacts; for those, prefer WebP (which keeps both efficient compression and crisp edges) or stay with PNG.

FAQ

Are my images uploaded anywhere during conversion?: No, conversion runs entirely in your browser via the canvas API. Your PNG file is decoded and re-encoded locally with no network requests.
What happens to the transparent areas in my PNG?: JPEG cannot store transparency, so the tool fills the background with white before encoding. If you need to preserve transparency, convert to WebP instead.
What quality level should I pick?: For photographs, 80-90 is the sweet spot for invisible quality loss with strong file-size savings. For UI screenshots or logos, JPEG may show artifacts at any quality — WebP is a better choice.
How much smaller will the JPG be than the PNG?: For photographs the JPG is typically 5-20x smaller than the PNG at quality 85. For graphics with sharp edges the savings are smaller and the artifacts more visible.
Will repeated PNG-to-JPG conversions degrade the image?: Yes, because JPEG is lossy. Always convert from the original PNG, not from a previously-converted JPG, to avoid stacking compression artifacts.