HOW TO CONVERT IMAGES TO WEBP

What Is WebP?

WebP is a modern image format developed by Google and released in 2010. It uses advanced compression algorithms — derived from the VP8 video codec — to achieve significantly smaller file sizes than JPEG, PNG, and GIF while maintaining comparable visual quality. As of 2024, WebP is supported by all major browsers: Chrome, Firefox, Safari (since 14), Edge, and Opera.

WebP supports lossy compression (like JPEG), lossless compression (like PNG), transparency (like PNG), and animation (like GIF) — all in a single format. This versatility, combined with its compression efficiency, makes it the best default choice for web images today.

Real-World Size Comparisons

The compression gains are substantial and consistent:

• Photographs: WebP lossy is typically 25–35% smaller than JPEG at equivalent visual quality
• Graphics with transparency: WebP lossless is typically 26% smaller than PNG
• Animations: WebP animated is typically 64% smaller than animated GIF

In practical terms: a 500KB hero image becomes 150–300KB as WebP. Multiply that across a page with 10–20 images and you're saving 2–5MB per page load — which translates directly to faster load times and better Core Web Vitals scores.

How to Convert Images to WebP

Using Armytool's Image Converter takes three steps:

1. Open armytool.site and select Image Converter
2. Drop your JPG, PNG, GIF, or BMP file into the drop zone
3. Select WebP as the output format, adjust quality (80–90 is usually ideal), and click Convert

The conversion runs entirely in your browser using the HTML5 Canvas API and the browser's built-in WebP encoder. Your image never leaves your device.

Choosing the Right Quality Setting

WebP's quality slider (0–100) controls the lossy compression level. Here's a practical guide:

• 90–100: Near-lossless. Indistinguishable from the original at 1:1 zoom. Use for product photography where fine detail matters.
• 75–90: High quality. The sweet spot for most web images — significant size reduction with no visible degradation at normal viewing sizes.
• 50–75: Medium quality. Good for thumbnails, social media previews, and images that will be displayed small.
• Below 50: Noticeable artifacts. Only useful for extremely bandwidth-constrained situations.

For most website images, quality 82 is the practical optimum — it's where the size-to-quality ratio peaks. Going from 82 to 90 adds about 20% to the file size for a quality improvement most users can't perceive.

When Not to Use WebP

WebP is almost always the right choice for web delivery, but there are exceptions:

• Print production: Send TIFF or high-quality JPEG to printers. WebP is a web format.
• Email clients: Some older email clients (particularly Outlook on Windows) don't render WebP. Use JPEG for email imagery.
• Original source files: Keep originals as RAW, TIFF, or high-quality PNG/JPEG. Only export to WebP for delivery.
• Very small images: For icons under 1KB, the overhead of format negotiation may outweigh the savings. Consider SVG instead.

Using WebP in HTML Correctly

The safest way to use WebP with a JPEG/PNG fallback:

<picture>
  <source srcset="hero.webp" type="image/webp">
  <img src="hero.jpg" alt="Hero image" loading="lazy">
</picture>

Browsers that support WebP use the <source>; browsers that don't fall back to the <img>. In 2026, all browsers in active use support WebP, so fallbacks are only needed if you're supporting IE11 or very old Safari — which you probably aren't.

Impact on SEO and Core Web Vitals

Google directly rewards image optimisation in its Core Web Vitals metrics, specifically Largest Contentful Paint (LCP). LCP measures how long it takes for the largest visible element — often a hero image — to load. Switching from JPEG to WebP typically reduces LCP by 0.5–1.5 seconds on mobile, which can move a site from "Needs Improvement" to "Good" on PageSpeed Insights.

Google's own PageSpeed Insights will flag unoptimised images and specifically suggest converting to WebP or AVIF. Converting your images is one of the highest-ROI performance improvements you can make.