PNG to JPG converter
Convert PNG images to JPG with adjustable quality and transparency flattened to white, all inside your browser.
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Converted to JPEG on your device - nothing is uploaded.
Ready · runs on your device
Nothing is uploaded. This tool runs entirely inside your browser tab. Your files and figures stay on your device - we never receive them, so we cannot read, store or lose them.
Why this conversion saves so much
PNG stores every pixel exactly. That is ideal for a logo and wasteful for a photograph, where no two adjacent pixels are alike and lossless compression has almost nothing to work with.
JPEG assumes photographic content and discards detail the eye is poor at noticing - chiefly fine colour variation. The result is dramatic on photographs:
| Content | PNG | JPG at quality 85 |
|---|---|---|
| 12 MP photograph | 24 MB | 2.1 MB |
| 1920×1080 screenshot | 1.4 MB | 320 KB (visibly degraded) |
| Flat-colour logo | 45 KB | 90 KB (larger and worse) |
Note the third row. On flat-colour graphics, JPEG can produce a larger file than PNG while also looking worse. The conversion pays off on photographic content and hurts on graphic content.
Transparency becomes white
There is no way for JPEG to store transparency, so this converter composites transparent areas onto a white background before encoding. Without that step, alpha would render as black - a common and ugly failure in tools that skip it.
If you need transparency preserved, WebP is the right target: it keeps the alpha channel and is typically smaller than both the PNG and the JPEG. The image converter handles that.
When to use this
- A photograph that was saved as PNG - screenshots of photos, exports from design tools, images pulled from a site that served PNG.
- Email attachments and uploads with a size limit.
- Legacy systems that accept JPEG only.
- Print submission where the printer specifies JPEG.
When not to
- Screenshots, UI captures and anything with text. JPEG’s block-based compression produces visible ringing around every hard edge. Text turns fuzzy in a way that is immediately obvious at 100% zoom.
- Logos and line art. Flat colours and sharp boundaries are PNG’s strength and JPEG’s weakness.
- Images needing transparency.
- Anything you will edit repeatedly. Every JPEG save degrades the image further.
Quality and generation loss
JPEG quality is not a percentage of anything meaningful - it is an encoder-specific scale. Quality 85 in one encoder does not exactly match 85 in another. What holds generally is the shape of the curve: gains are steep up to about 70, gentle from 70 to 90, and negligible above 95 while file size climbs sharply.
Convert once, from the best original you have. Repeatedly converting between formats compounds loss at every step, and the damage is not recoverable.
Common questions
What happens to the transparent parts?
They become white. JPEG has no alpha channel, so transparency has to be replaced with something and white is the sensible default for almost every use. If the transparency matters - a logo destined for a coloured background - convert to WebP instead, which keeps the alpha channel and still compresses well.
How much smaller will the file be?
For photographs saved as PNG, expect 80–95% smaller. For screenshots and flat-colour graphics the saving is much smaller and the result often looks worse, because JPEG handles hard edges and text poorly.
What quality should I pick?
90 for anything where quality matters, 80 for general web use, 70 when size is the priority. Below 60 the artefacts around edges become obvious, particularly on any image containing text.
Should I convert screenshots to JPG?
Generally no. Screenshots are full of sharp edges and text - exactly what JPEG compresses worst. You will get visible fringing around every letter. Keep screenshots as PNG, or use WebP for a smaller lossless file.
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