Which format should you pick?
| ★ RecommendedWebP | JPG | PNG | BMP | |
|---|---|---|---|---|
| Best for | Web (the modern default) | Photos, email, legacy apps | Logos, screenshots, transparency | Almost never — legacy only |
| Size | Smallest | Medium | Larger | Huge |
| Quality | Excellent | Good (lossy) | Perfect (lossless) | Perfect |
| Transparency | Yes | No | Yes | No |
The 30-second rule
If your image has transparency → PNG. If it's a photo for the web → WebP. If you need maximum compatibility → JPG. That covers 99% of decisions.
Common conversions and when they make sense
- PNG → WebP — Cuts file size 50–80% for photographic content with minimal visible change. Best web optimization win.
- JPG → WebP — Same file becomes 25–35% smaller at the same quality. Easy SEO improvement.
- WebP → JPG — When sharing somewhere that doesn't support WebP (some older apps, email clients, print shops).
- PNG → JPG — Photos accidentally saved as PNG (often 3–5× larger than they should be).
- HEIC / iPhone → JPG — Make iPhone photos shareable everywhere.
Transparency caveat
Converting a transparent PNG to JPG will replace the transparent areas with a white background — JPG doesn't support transparency. If transparency matters, stick with PNG or WebP.
FAQ
Does the conversion lose quality?
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PNG and BMP outputs are lossless — identical pixels. JPG and WebP are lossy: at 90%+ quality the difference is invisible, below 75% you'll start to notice artifacts in detailed areas.
Can I convert multiple images at once?
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Yes. Drop a batch into the upload zone — they convert in parallel. There's a "Download All" button once they're done.
Are my images uploaded anywhere?
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No. All conversion happens in your browser using the Canvas API. Your files stay on your device — useful for sensitive screenshots or work-confidential images.