How to Convert Images Online Free — JPG, PNG, WebP & More
Updated October 2026 · 4 min read
Quick start: Open the free Image Converter — upload any image and convert to JPG, PNG, WebP or BMP in one click. No signup, nothing sent to servers.
Choosing the wrong image format can double your file size, cause transparency to break, or slow down your website. Here is a practical guide to when to use each format — and how to convert between them in seconds.
Which Image Format Should You Use?
| Format | Best for | Transparency | Typical size |
|---|---|---|---|
| JPG/JPEG | Photos, complex images | No | Smallest (lossy) |
| PNG | Logos, screenshots, graphics | Yes | Larger (lossless) |
| WebP | Web images (modern browsers) | Yes | 25–35% smaller than JPG |
| GIF | Simple animations | 1-bit only | Large for animations |
| BMP | Windows system/legacy | Yes | Very large (uncompressed) |
WebP — The Web Standard Worth Switching To
WebP delivers 25–35% smaller file sizes than JPG at equivalent visual quality, and supports transparency like PNG. All major browsers (Chrome, Firefox, Safari 14+, Edge) support it. For new web projects, serving WebP as the primary format and JPG/PNG as fallback is now best practice. Google's Core Web Vitals reward faster page loads — smaller images directly improve your LCP (Largest Contentful Paint) score.
PNG to JPG — What You Lose
Converting PNG to JPG is irreversible (lossy compression) and removes transparency — any transparent areas become white or a solid colour. Only convert if you do not need transparency and want a smaller file. For logos and design assets, keep the original PNG.
Why Browser-Based Conversion Matters for Privacy
Many image converters upload your files to a cloud server for processing. For sensitive screenshots, internal documents or client work, this is a privacy risk. MetricPane's converter runs entirely in your browser using the Canvas API — your images never leave your device.
Convert Images Free — No Upload Required
JPG, PNG, WebP, GIF and BMP. Runs 100% in your browser. No file size limits, no account needed.
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