Convert PNG to JPG Online — Optimize File Size with Custom Matte
PNGs with photographs can be bloated and slow down websites. Converting to JPG cuts size by up to 70% while allowing you to choose the exact background matte color for transparent areas.
When converting PNG to JPG on llmscope.link, your files are decoded and re-encoded entirely within your computer’s browser sandbox via the HTML5 Canvas API and WebAssembly. No image files or telemetry packets are ever uploaded, logged, or retained on any remote server.
| Specification | PNG (Source) | JPG (Target) |
|---|---|---|
| Compression Mechanism | Lossless DEFLATE | Lossy DCT (Adjustable 1-100% quality) |
| Alpha Transparency | Supported | Not supported (Filled with configurable matte color) |
| Animation Support | Static only | Static only |
| Browser Support | 100% universal | 100% universal |
| Typical Data Delta | 50% to 75% size reduction for complex photos | |
- High-resolution photography
- Email newsletters & attachments
- Social media uploads requiring JPEG
- E-commerce product photo galleries
Upload PNG
Drop your PNG file onto the converter workspace.
Choose matte color
Select background color (white, black, or custom hex) to fill transparent pixels.
Set JPEG quality
Adjust the quality slider (80-90% is ideal for the best balance of fidelity and size).
Download JPG
Save your optimized JPEG file instantly.
Q:What happens to transparent pixels when converting to JPG?
Since JPG does not support alpha transparency, transparent areas are blended with the matte color you choose (white by default).
Q:Is converting PNG to JPG good for screenshots?
For text-heavy screenshots, PNG or WebP is usually sharper. For photographic screenshots, JPG produces much smaller file sizes.
Q:Are my photos stored on your servers?
No. llmscope.link has zero backend storage. Processing executes exclusively on your device.