PNG to AVIF Converter
Convert PNG images to AVIF instantly in your browser — with SEO-ready alt text auto-generated by AI. Free, no upload required, and works on any device. The most efficient web format today. ~50% smaller than JPEG with HDR support.
Why convert PNG to AVIF?
The most efficient web format today. ~50% smaller than JPEG with HDR support. Converting from PNG to AVIF is one of the fastest wins for Core Web Vitals — smaller files mean faster Largest Contentful Paint and better Google rankings.
100% in-browser conversion
Your PNG files never leave your device. Conversion happens entirely in the browser using the Canvas API, so it's private, instant, and free — no queue, no watermark, no signup for conversion.
SEO alt text included
Every converted image gets an AI-generated alt tag optimized for screen readers and search engines. Copy it straight into your CMS, no rewriting needed.
How to convert PNG to AVIF
- Open the AltPixel converter.
- Drag and drop your PNG files, or click to browse.
- Set the output format to AVIF.
- Wait ~1 second for conversion (runs in your browser).
- Copy the AI-generated alt text and download the AVIF.
Frequently asked questions
Is this PNG to AVIF converter really free?
Yes. Image conversion is 100% free and unlimited — no signup required. Only the optional AI alt-text generation uses credits (5/day free, 2,000/month on Pro).
Will converting PNG to AVIF lose quality?
AVIF is a lossy format. AltPixel uses quality 0.9, which is visually indistinguishable from the original for almost all photos.
Does AVIF help with SEO?
Yes. Google's PageSpeed Insights and Core Web Vitals reward smaller image payloads. Serving AVIF instead of PNG typically drops image weight by 30–70%, directly improving LCP scores and Google rankings.
Can I batch convert multiple PNG files?
Yes — up to 10 files at once. Drop them all on the tool, pick AVIF as the output format, and download each result with its AI alt text.
Is AVIF supported in all browsers?
AVIF is supported in Chrome, Firefox, Safari 16.4+, and Edge — around 93% of browsers. Use a <picture> tag with a JPEG fallback for older Safari.