Image Format Conversion for the Modern Web
Choosing the wrong image format adds unnecessary file weight, slows page load, and reduces image search visibility. MeloTools converts between all major web image formats entirely in your browser, with no file upload and no account required.
Format Reference: When to Use Each
AVIF — Best compression efficiency of any widely supported format in 2026. Typically 40–60% smaller than JPEG at equivalent visual quality. Use for all static web delivery where browser support allows (~94% global coverage).
WebP — 25–35% smaller than JPEG at equivalent quality. Near-universal browser support (~97%). Use as the primary format when AVIF is not an option, or as a fallback behind AVIF in <picture> elements.
JPEG — Best for photographs requiring universal compatibility: email, legacy systems, external sharing. Not suitable for transparency. Lossy compression accumulates with each re-save.
PNG — Lossless format. Use for transparency, UI elements, diagrams, screenshots, and any image that will be edited further. Larger than JPEG and WebP for photographic content.
HEIC — Apple's format for iPhone photos. Convert to JPEG or WebP before using on the web. Not natively supported in most browsers.
How MeloTools Conversion Works
All conversions run in your browser using the Canvas API and browser-native codecs. No image is uploaded to any server at any point. You can verify this by watching the Network tab in browser DevTools — zero outbound file transfers occur during conversion.
Frequently Asked Questions
Which format should I convert to for a website?
For most web use, convert to AVIF first, with a WebP fallback for older browsers. Use a <picture> element to serve AVIF to supported browsers and WebP to the rest. Both formats significantly outperform JPEG and PNG for web delivery.
Does converting between formats reduce quality?
Lossy conversions — to JPEG, WebP lossy, or AVIF lossy — apply compression. Lossless conversions — to PNG, WebP lossless, or AVIF lossless — do not. MeloTools defaults to balanced quality settings that preserve visual fidelity for typical web use.
Can I convert multiple images at once?
Yes. Drop multiple files into any converter simultaneously. The free plan processes up to 10 images per batch. Premium supports up to 50 images per batch.
Are my files safe?
Yes. Conversion runs entirely in your browser. Your files never leave your device and are not accessible to MeloTools or any third party.
