Free Image Converter with AI SEO Alt Text
The only tool that converts your image and writes its SEO-ready alt text at the same time. No second tool, no copy-paste, no upload — it all happens in your browser.
Drop up to 10 images here
PNG, JPEG, WebP, or AVIF (Max 10MB per file) — 10 slots left
Every major format
Convert freely between PNG, JPEG, WebP, and AVIF. Swap direction anytime.
AI SEO alt text
Each image gets a screen-reader-ready, search-optimized alt tag you can copy in one click.
Batch up to 10
Process ten images in parallel. Great for landing pages, product galleries, and blog posts.
Simple Transparent Pricing
- • 5 conversions per day
- • Standard AI alt text
- • Max 2 images at once
- • 2,000 conversions per month
- • High-precision SEO AI alt text
- • 10 images batch processing
- • All formats (PNG, JPEG, WebP, AVIF)
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Image SEO Guides
Everything we know about ranking images in Google — distilled from real client work.
SEO Alt Text: The 2026 Best-Practices Guide
How to write alt text that ranks in Google Images and helps screen readers. Real examples, length limits, keyword rules, and mistakes to avoid.
WebP vs AVIF: Which Should You Actually Use?
WebP vs AVIF compared on file size, browser support, encoding speed, and Google Core Web Vitals impact. Data-driven verdict for real sites.
Image Optimization for Google: The Complete Checklist
Every image SEO tactic that actually moves rankings: next-gen formats, alt text, lazy loading, image sitemaps, structured data, and Core Web Vitals.
How to Write Alt Text (With Real Examples)
Write alt text that ranks in Google Images and passes WCAG accessibility. 8 rules, 15 real examples across products, blogs, and infographics.
Frequently Asked Questions
Is AltPixel really free?
Image conversion is 100% free and unlimited — no signup, no watermark, no upload to a server. AI alt-text generation is 5/day free; the $19/month Pro plan lifts that to 2,000/month.
Which image formats does AltPixel support?
Input: PNG, JPEG, WebP, AVIF, and GIF. Output: WebP, AVIF, PNG, or JPEG. AVIF encoding requires a modern browser (Chrome, Firefox, Safari 16.4+, Edge).
Do my images get uploaded to a server?
No. Image conversion happens 100% in your browser using the Canvas API. Only the optional AI alt-text step sends the image to our vision model — never the file itself for conversion.
How does converting to WebP or AVIF improve SEO?
Both formats are 30–70% smaller than PNG/JPEG at equal quality. Smaller images mean faster Largest Contentful Paint (LCP), one of Google's three Core Web Vitals ranking factors.
Is the AI alt text good enough for real SEO?
Yes. AltPixel's alt text follows all 8 documented rules for SEO alt text — under 125 chars, descriptive, no keyword stuffing, screen-reader friendly, and unique per image.
Can I batch convert multiple images at once?
Yes — up to 10 images per batch. Drop them all on the tool, pick your output format, and download each converted file with its own AI-generated alt text.