PNG to JPG

What it does

Converting PNG to JPG is the most-common image conversion in everyday workflows because PNG (lossless, larger files) is what comes out of screenshot tools, design software, and many cameras, while JPG (lossy, much smaller files) is what email clients, web platforms, and most casual sharing destinations expect. The conversion is a one-way trip: you cannot recover the lossless PNG quality from a JPG. So the right time to convert is when you're ready to share the file and want the smaller size — keep PNG masters for archive and editing, share JPG for distribution.

The tool reads the PNG via the browser's native decoder, draws it onto a Canvas with your chosen background color filling any transparent pixels (JPG has no alpha channel, so transparent areas become the background — white by default, black or any custom color available), then encodes via Canvas.toBlob('image/jpeg', quality). Quality slider runs 0-1 (or 0-100% in the UI); 0.8 (80%) is the visually- lossless sweet spot for most photos — virtually indistinguishable from the original PNG at typical viewing sizes, with file size 5-10× smaller. 0.9+ produces files barely smaller than the input PNG; 0.6 and below starts showing visible compression artifacts (blocking, halos around sharp edges).

When the conversion is the right move: you're sharing photos via email, uploading to a website with file-size limits, posting to social media (most platforms re-encode anyway, so save the bandwidth), or batch-shrinking a folder of PNG screenshots that don't need transparency. When PNG is better: the image requires transparency (logos, icons, knockouts), the image has flat colors and sharp edges (charts, diagrams, screenshots of UI — JPG produces visible artifacts on these), or you'll edit further (each JPG re-save introduces fresh compression loss). For modern web destinations supporting WebP, WebP at quality 80 typically beats JPG at quality 85 in both quality and file size.

How to use it

1. Drop your PNG file(s) — multiple files supported for batch.
2. Pick the background color (white default; black, transparent area becomes the chosen color).
3. Set quality (50-100; 80 is the visually-lossless sweet spot).
4. Click Convert — outputs as JPG with substantial size reduction.
5. Download — or run multiple PNGs through with consistent settings.

When to use this tool

• Email attachments where bandwidth matters (JPG 5-10× smaller than PNG for photos).
• Web upload destinations with file-size limits.
• Social media (most platforms re-encode regardless; save the upload bandwidth).
• Batch shrinking screenshot folders before archiving.
• Photos from cameras that save PNG but don't benefit from PNG's lossless feature.

When not to use it

• Images requiring transparency (logos, icons) — JPG can't do alpha; backgrounds become solid color.
• Charts, diagrams, screenshots with sharp edges and flat colors — JPG produces visible artifacts on these. Keep PNG.
• Source images you'll edit further — each JPG re-save compounds compression loss; keep lossless PNG masters.
• Modern web destinations supporting WebP — WebP at q80 beats JPG at q85 for both quality and size.

Common use cases

• Pre-decision sanity-check on inputs and outputs
• Educational use — demonstrating the underlying concept
• Onboarding a colleague who needs the same calculation/conversion
• Verifying a number or output before passing it on