Image Alt Text for SEO: The Complete Optimization Guide for 2026

Executive Summary: Image alt text is a short HTML attribute that describes what an image shows. In 2026, it is simultaneously the most important image SEO signal, a legal accessibility requirement, and an emerging factor in AI-powered search citations. Despite its importance, 53.1% of the top one million websites still have images with missing alt text — making this one of the highest-impact, lowest-effort SEO wins available to any website. This guide covers exactly what alt text is, how to write it for both SEO and accessibility, real before-and-after examples, common mistakes, and a practical framework you can apply to every image you publish.

1. What Is Image Alt Text?

Alt text — short for "alternative text" — is a written description embedded in the HTML alt attribute of an image tag. It serves as a textual substitute for the image in situations where the image cannot be seen: by a screen reader reading the page aloud to a visually impaired user, by a browser when an image fails to load, or by a search engine crawler that cannot interpret pixels.

Here is what image alt text looks like in HTML:

<img src="seo-audit-checklist.webp" alt="A printed SEO audit checklist with 12 ranking factors checked off in green" width="800" height="450">

Without the alt attribute, this exact same image tag becomes invisible to search engines, screen readers, and users on slow connections who see images before they load. With a well-written alt attribute, the image contributes to the page's topical relevance, ranks in Google Images, supports users with disabilities, and reinforces the keyword signals on the page.

It is worth distinguishing alt text from two things it is often confused with:

• The image title attribute (title="") is a tooltip that appears when a user hovers over an image. It has minimal SEO value and is separate from alt text.
• The image caption is visible text displayed below an image in the page's content. Captions are valuable for both UX and SEO but serve a different purpose than alt text.

Alt text is invisible to typical website visitors — it lives in the code. But it is one of the most powerful signals you can optimize on any page that contains images.

2. Why Alt Text Matters for SEO in 2026

Search engine optimization has dozens of ranking factors, but alt text holds a unique position: it is the single highest-impact image SEO action according to nearly every authoritative source, and it simultaneously serves multiple ranking functions at once.

Google Cannot See Images — It Reads Alt Text

Googlebot crawls your pages as text-based code. When it encounters an <img> tag, it cannot visually interpret what the image shows. It reads the alt attribute. Google has improved at inferring image content through machine learning — but explicit, accurate descriptions in alt text consistently carry more weight than algorithmic guesses. When your alt text matches what the image actually shows and aligns with the surrounding content, Google develops a higher-confidence understanding of your page's topical relevance.

Google Images Is a Major Traffic Channel

Google Images drives approximately 22% of all web searches globally. For blogs, e-commerce, recipes, travel, real estate, and editorial content, this is not a minor side channel — it is a primary discovery pathway that most sites leave almost entirely untapped. Every image with well-written alt text is eligible to appear in Google Images results, in Image Pack carousels on the main search results page, and in Google Lens results. Every image without alt text is invisible to this channel.

Alt Text Reinforces Page Topical Authority

Google's multimodal AI systems in 2026 read images and their surrounding text as a single semantic entity. If your page discusses a specific topic but your image alt text is generic or empty, it creates a mismatch that reduces the page's topical coherence in Google's understanding. Accurate, descriptive alt text that naturally reflects the page's keyword theme reinforces topical authority across the entire document.

Alt Text Contributes to Core Web Vitals Indirectly

Images without defined dimensions — even with alt text — can cause Cumulative Layout Shift (CLS), a Core Web Vitals signal. While CLS is addressed by width/height attributes rather than alt text directly, the habit of writing proper, complete image markup (including alt text, dimensions, and format) correlates with pages that score better overall on Core Web Vitals.

AI Overviews Use Image Context

Google's AI Overviews, which now appear in the majority of informational searches, pull content from pages that demonstrate clear, accurate information. Alt text contributes to the AI system's understanding of what a page covers — pages where images are properly described alongside well-structured text give AI systems the confidence to cite them as authoritative sources.

3. Alt Text and Accessibility: The Legal Dimension

For many website owners, SEO is the primary motivation for writing alt text. But there is an equally important — and increasingly legally significant — reason: accessibility.

Users who are blind or have low vision navigate the web using screen reader software such as JAWS, NVDA, or Apple VoiceOver. Screen readers read aloud the content of web pages in sequence. When they reach an image, they announce the alt text. Without alt text, a screen reader might announce "image" or read the raw filename — "IMG_4782.jpg" — which is completely meaningless and breaks the page's comprehension for that user.

According to the WebAIM Million 2026 report, which analyzed the top one million home pages, 53.1% still have at least one image missing alt text. That translates to more than ten images per page, on average, that are completely invisible to screen reader users.

Regulatory Requirements

Multiple legal frameworks now mandate web accessibility standards that include alt text requirements:

• WCAG (Web Content Accessibility Guidelines) 2.1 and 2.2: The W3C standard that most regulations reference. Success Criterion 1.1.1 requires text alternatives for all non-decorative images. WCAG 2.2 Level AA is considered the international benchmark.
• ADA (Americans with Disabilities Act): U.S. courts have consistently ruled that commercial websites must be accessible, with WCAG compliance as the standard. Missing alt text on product images or informational graphics has resulted in successful lawsuits.
• European Accessibility Act (EAA): The EAA came into force in 2025, requiring digital products and services offered in EU markets to meet accessibility standards — including alt text for images.
• Section 508 (U.S. Federal): Government and federally funded websites must comply with Section 508, which mandates alt text for all meaningful images.

The legal risk is real and growing. The good news is that writing alt text is simple, free, and takes seconds per image. The same action that improves your SEO also satisfies legal accessibility requirements — making it one of the highest-return practices in web publishing.

4. How to Write Alt Text: The Step-by-Step Framework

Writing effective alt text is a learnable skill. It is not about fitting as many keywords as possible into a short string. It is about describing what the image actually shows in a way that is useful to someone who cannot see it — and that happens to align naturally with the topic of the page.

Step 1: Ask the Right Question First

Before writing a single word, ask yourself: "What information would a visually impaired user miss if they could not see this image?" That answer is the core of your alt text. Start from purpose, not from keywords.

Step 2: Be Specific and Descriptive

Generic alt text is nearly as useless as no alt text. "Image of a man" tells almost nothing. "A web developer reviewing code on a dual-monitor setup" is specific, accurate, and useful. The more specific you are, the more value you deliver — to both users and search engines.

Step 3: Include Context, Not Just Literal Description

Consider why the image exists on the page. An image of a dog on a veterinary clinic website means something different than the same image on a dog food brand's website. The surrounding context should influence how you describe the image.

Step 4: Integrate Keywords Naturally — Not Forcefully

If the image is genuinely related to your page's topic, the relevant keyword will fit naturally. Write the description first, then check whether a keyword fits. If it does, great. If it does not fit naturally, do not force it. Keyword-stuffed alt text is penalized by Google and makes the content worse for screen reader users.

Step 5: Stay Within 80–140 Characters

Most screen readers cut off alt text at around 125 characters. The sweet spot recommended by accessibility experts is 80–140 characters — enough detail to be genuinely useful, concise enough not to overwhelm. You do not need to write a paragraph; you need to write a sentence.

Step 6: Skip "Image of" or "Photo of"

Screen readers already announce that they are reading an image before reading the alt text. Starting your alt text with "Image of..." or "Photo of..." is redundant and wastes your character budget. Start directly with the description.

Step 7: Use Empty Alt Text for Decorative Images

Not every image needs a description. Purely decorative images — background patterns, dividers, icon illustrations that add aesthetic value but no informational content — should have an empty alt attribute: alt="". This tells screen readers to skip the image entirely, rather than reading a meaningless description. Important: the alt="" attribute must be present. Omitting the alt attribute entirely is different and causes screen readers to announce the file name.

5. Good vs. Bad Alt Text: Real Examples

The fastest way to understand effective alt text is to see the contrast between weak and strong versions on the same image type. Here are real-world examples across common content categories.

6. Alt Text for Different Image Types

Different types of images require different alt text approaches. Understanding these distinctions prevents both over-description and under-description.

Informational Images

Images that convey information the user needs — charts, diagrams, screenshots, infographics, product photos, instructional step images — require detailed, descriptive alt text. The alt text should communicate the key information the image contains so that a user who cannot see the image still receives the same content value.

Functional Images

Images that perform a function — a logo that links to the homepage, a search icon button, a social media share button — should have alt text that describes the function, not the image. A logo linking to the homepage should use alt="[Brand Name] homepage", not alt="logo" or the exact logo design description.

Decorative Images

Background textures, aesthetic dividers, purely ornamental illustrations, and stock photos used only for visual padding are decorative. They add no informational content. These should receive empty alt text: alt="". This is not laziness — it is correct accessibility practice. Describing decorative images creates noise for screen reader users navigating the page.

Complex Images: Charts, Graphs, and Infographics

When an image contains a lot of data — a bar chart, a multi-part infographic, a process flow diagram — alt text alone may be insufficient. The best practice is a two-part approach:

1. Write a concise alt text that summarizes the image's purpose: alt="Bar chart comparing average monthly organic traffic before and after implementing schema markup"
2. Include a full text alternative in the visible page content — either a data table below the chart, or a text paragraph summarizing the key data points the chart conveys.

Images of Text

Images that contain text — promotional banners with text, screenshots with readable content, logos with text — should have alt text that includes the exact text visible in the image. If a promotional banner says "50% Off All Premium Tools — This Week Only," the alt text should reproduce that text.

7. How to Use Keywords in Alt Text Without Stuffing

Keyword optimization in alt text is one of the most misunderstood aspects of image SEO. The spectrum runs from two equally wrong extremes: ignoring keywords entirely, and forcing as many keywords as possible into every alt attribute. The correct approach sits in the middle.

What Keyword Stuffing in Alt Text Looks Like

Keyword stuffing is when alt text becomes a string of keyword phrases rather than a genuine description:

❌ Stuffed: alt="best SEO tools free online SEO analyzer keyword research SEO audit tool 2026"

Google explicitly penalizes this. The image may be deindexed, and the page's overall ranking can suffer. For screen reader users, this is jarring and meaningless.

What Natural Keyword Integration Looks Like

Natural keyword integration means writing a genuine description first, then noticing whether the target keyword fits authentically:

✅ Natural: alt="SEO Analyzer Pro showing a complete site audit score and technical SEO recommendations"

The keyword "SEO Analyzer" appears because it accurately describes what the image shows — not because it was forced in. The description is useful, accurate, and readable.

The One-Keyword Rule

Aim for zero or one keyword mention per alt text. One naturally fitting keyword is plenty. Two is sometimes acceptable if the image genuinely involves two distinct concepts. Three or more is almost always stuffing. Every image on a page does not need to target the same keyword — distribute naturally across the variety of images on the page.

Prioritize Description, Let Keywords Follow

The most reliable approach: write the most accurate, useful description of the image you can. Then read it back. If your target keyword fits naturally within that description, it will likely already be there. If it is not, and forcing it would make the description sound unnatural, leave it out. The description is correct. The keyword will find other homes on the page — in headings, body text, and captions.

8. Alt Text vs. Image Title vs. Caption: What Is the Difference?

These three image attributes are frequently confused. Understanding the distinct role of each lets you optimize all three correctly.

How to Use Each Effectively

Alt text is non-negotiable. Write it for every meaningful image. Image title is optional and has minimal impact — use it only if you want to provide hover-tooltip context on desktop for functional reasons, not for SEO. Captions are highly underused and genuinely valuable: Google reads captions and uses them to confirm and extend its understanding of an image's context. If an image conveys important information, a caption that elaborates on it improves both UX and SEO. File names should be descriptive and hyphenated — seo-audit-checklist-2026.webp not IMG_4782.webp.

9. Alt Text in AI Search and Google Lens (2026)

The emergence of AI-powered search fundamentally raises the stakes for image alt text. Understanding how AI search engines use alt text — and how to optimize for them — is the most forward-looking part of image SEO in 2026.

Google's Multimodal AI and Image Understanding

Google's search systems in 2026 use multimodal AI — systems that can process text, images, audio, and video as connected signals rather than independent channels. When Google's AI crawls a page, it does not evaluate the image and the text separately. It reads them as a single entity. The alt text, the surrounding paragraph, the page heading, the image caption, and the image's visual content all feed into a unified understanding of what the page is about.

This has a direct implication: a mismatch between your alt text and the surrounding content damages topical coherence. If your page is about website speed optimization but an image of a loading spinner has alt text like "circle animation," Google's multimodal system sees an inconsistency. If the same image has alt text like "Animated loading spinner representing slow page load times and poor Core Web Vitals scores," the consistency reinforces the page's topical authority.

Google Lens and Visual Search

Google Lens processes billions of visual queries monthly and is growing at approximately 30% annually. Users point their phone cameras at products, menus, plants, buildings, and text to perform search queries. When Lens identifies an image that matches something on your website, the alt text and surrounding content influence where and how your page appears in the results.

For e-commerce especially, well-optimized alt text on product images can drive Lens-originating traffic — users who photograph a product they like in a physical store and discover your page in the results. This is an emerging traffic channel that most competitors are not yet optimizing for.

AI Overviews and Image Citations

Google AI Overviews — which appear in search results for the majority of informational queries — sometimes include images pulled from cited pages. Pages where images have accurate, descriptive alt text that matches the page's content are more likely to have their visuals selected for inclusion in AI Overview panels. Alt text contributes to the confidence an AI system has in citing your page as an authoritative source on a topic.

Perplexity, Bing Copilot, and ChatGPT Search

Other AI search platforms use similar signals. Perplexity AI surfaces well-structured pages with clear semantic signals. Bing's Copilot integration reads both text and image metadata when assembling answers. ChatGPT Search prioritizes pages where content — including image descriptions — is consistent, accurate, and well-organized. Writing good alt text in 2026 is not just about Google; it is about being legible to the entire AI search ecosystem.

10. How to Audit and Fix Missing Alt Text on Your Website

Before you can improve your alt text, you need to know where the gaps are. Here is how to audit your site for missing or weak alt text efficiently.

Method 1: Use an SEO Analyzer Tool

The fastest way to identify missing alt text across your site is to run a technical SEO audit. An audit tool crawls your pages and flags every image missing an alt attribute. The SEO Analyzer Pro on SEO Tool Kit Pro checks for missing alt text as part of its on-page audit, alongside 50+ other technical SEO checkpoints. Paste your URL and run the audit to get a prioritized list of image alt text issues.

Method 2: Browser DevTools Inspection

On any page, right-click and select "Inspect" (Chrome or Firefox) to open DevTools. Press Ctrl+F to search within the HTML and search for img. Scan through the image tags and check whether each has a meaningful alt="" attribute. This is effective for page-by-page manual checking but does not scale to large sites.

Method 3: Google Search Console Coverage Check

Google Search Console does not directly report missing alt text, but pages with image-related issues sometimes surface in the "Enhancements" or "Experience" reports. Pair GSC data with a dedicated audit tool for comprehensive coverage.

Method 4: Accessibility Audit Tools

Browser extensions like WAVE (Web Accessibility Evaluation Tool) or axe DevTools highlight missing alt text and other accessibility issues visually on the page itself. These are excellent for page-level audits and show the issues in context, making them faster to understand and fix.

Prioritizing Fixes

Not all missing alt text is equally urgent. Prioritize in this order:

1. High-traffic pages — pages already receiving visitors lose the most by having images unindexed.
2. Product pages and conversion pages — missing alt text on product images is both an SEO and an accessibility issue with direct revenue impact.
3. Featured images and hero images — the primary visual of any page should always have a well-written alt text.
4. Infographics and charts — complex images with data require the most detailed alt text and are often the most neglected.
5. Decorative images — confirm they have alt="" (empty, not missing).

11. The Complete Alt Text SEO Checklist

12. Image SEO Beyond Alt Text: File Names, Formats, and Schema

Alt text is the single highest-impact image SEO action — but it does not exist in isolation. A complete image SEO strategy integrates alt text with several supporting elements that together determine how well your images rank and perform.

Descriptive File Names

Your image file name is the first signal Google processes before it even reads the alt text. A file named IMG_4782.jpg tells Google nothing. A file named seo-audit-checklist-google-2026.webp tells Google immediately what the image is about. Use lowercase letters, hyphens (not underscores) to separate words, and keep names specific but concise. Rename images before uploading — renaming after the fact requires updating any links to the old URL.

Image Format: WebP and AVIF

Image format directly affects page speed, which affects Core Web Vitals scores, which affect rankings. WebP delivers 25–35% smaller file sizes than JPEG at equivalent visual quality and is universally supported in 2026. AVIF offers 50–70% size reduction over JPEG but requires a fallback for older browsers. Serving images in WebP by default is now the baseline standard. The free WebP Converter on SEO Tool Kit Pro converts PNG and JPG files to WebP format in seconds, with no quality loss — giving you a fast, Google-friendly image format for every page.

Image Compression

Even in the right format, oversized images slow down page load times. Compression removes unnecessary data without visible degradation to image quality. The Image Compressor on SEO Tool Kit Pro compresses images without visible quality loss — ideal for preparing images before uploading to your CMS. Smaller images load faster, which directly improves Largest Contentful Paint (LCP), a Core Web Vitals signal that affects rankings.

Image Dimensions

Use the Image Resizer to resize images to the exact dimensions they will be displayed on the page before uploading. Serving a 3000×2000 pixel image in a 600×400 display area wastes bandwidth and slows loading. Resizing to the display dimensions eliminates this waste and speeds up LCP.

Image Sitemaps

An image sitemap (or image tags within your existing XML sitemap) tells Google explicitly which images you want indexed and provides additional metadata. Google's image sitemap extension supports the <image:title> and <image:caption> tags, which supplement alt text. Large image-heavy sites — e-commerce, photography, real estate — benefit significantly from maintaining a comprehensive image sitemap.

ImageObject Schema Markup

Adding ImageObject schema markup using JSON-LD tells Google structured, machine-readable information about your images — including the name, description, caption, URL, and the author or creator. This is particularly valuable for original photography, infographics, and product images. Schema markup has been confirmed by Google Search Central as carrying ranking weight in visual and multimodal search. The Schema Generator on SEO Tool Kit Pro can generate ImageObject JSON-LD markup ready to paste into your page's <head> section.

Background Removal for Professional Images

Clean product images — photographed against a white or transparent background — perform better in Google Shopping, Google Lens results, and e-commerce contexts. The Background Remover on SEO Tool Kit Pro removes image backgrounds with AI in seconds, giving you clean, professional product visuals ready for any platform.

13. Conclusion

Image alt text is one of those rare SEO elements where doing the right thing for search engines and doing the right thing for users are exactly the same action. Writing accurate, descriptive alt text makes your images accessible to people who rely on screen readers, makes your content legible to Googlebot, makes your pages eligible for Google Images and Google Lens traffic, and contributes to the topical authority signals that AI search engines use when deciding what to cite.

The barrier to implementing it correctly is extremely low. The opportunity is significant — 53.1% of major websites still have images with missing alt text, which means writing good alt text puts you ahead of more than half your competitors on a fundamental technical dimension.

The framework is straightforward: describe what the image shows, be specific, integrate keywords only where they fit naturally, keep it under 140 characters, and use empty alt text for decorative images. Apply the checklist from Section 11 to every page you publish going forward, then audit and fix your existing pages starting with the highest-traffic ones.

Pair strong alt text with properly formatted images — WebP format, compressed to the right size, resized to display dimensions — and you have a complete image SEO pipeline that serves both Google and your visitors. The tools to do all of this are available for free at SEO Tool Kit Pro's full tool suite, from the WebP Converter and Image Compressor to the SEO Analyzer Pro that checks your alt text coverage automatically.

Frequently Asked Questions

1. What is image alt text and why does it matter for SEO?

Alt text (alternative text) is an HTML attribute added to an image tag that provides a written description of the image. It matters for SEO because Googlebot cannot visually interpret images — it reads alt text to understand what an image shows. Well-written alt text helps images rank in Google Images, reinforces the topical relevance of your page, contributes to AI Overview eligibility, and satisfies accessibility requirements. It is consistently ranked as the single highest-impact action in image SEO.

2. How long should image alt text be?

The optimal length for alt text is 80–140 characters. Screen readers typically cut off alt text at around 125 characters, so staying under 140 ensures the full description is read. The goal is enough detail to be genuinely useful — not so much that it overwhelms. A single clear sentence describing what the image shows usually hits the right length naturally. Do not pad to a minimum length; do not over-describe to be thorough.

3. Should I put keywords in my image alt text?

Yes — but naturally, and sparingly. Include your target keyword in an image's alt text only when the image genuinely depicts something related to that keyword. Write the description first as if keywords did not exist, then check whether the keyword fits. If it does, great. If forcing the keyword in would make the description unnatural or misleading, leave it out. Keyword stuffing alt text — packing multiple keyword phrases into a single alt attribute — is a Google guideline violation and can hurt your rankings.

4. What should decorative images have as alt text?

Decorative images — background patterns, aesthetic dividers, purely ornamental illustrations — should have an empty alt attribute: alt="". This tells screen readers to skip the image, which is the correct behavior for content that has no informational value. The alt="" attribute must be present and explicitly empty. Omitting the alt attribute entirely is different — without any alt attribute, screen readers may announce the image file name, which is confusing and unhelpful.

5. Does alt text help with Google Images rankings?

Yes. Alt text is the primary signal Google uses to understand and index images for Google Images. An image without alt text is essentially invisible to image search. With accurate, descriptive alt text, your images become eligible to appear in Google Images results, in Image Pack carousels on the main search results page, and in Google Lens results. Google Images drives approximately 22% of all web searches — a significant traffic channel most sites leave untapped by neglecting alt text.

6. What is the difference between alt text and the image title attribute?

Alt text (alt="") is read by screen readers and search engines. It is the primary image accessibility and SEO attribute. The image title attribute (title="") creates a tooltip that appears when a sighted user hovers over an image on a desktop browser. It has minimal SEO value and is not a substitute for alt text. From an accessibility perspective, some screen readers read both attributes, which can cause redundancy — this is one reason to keep image title attributes simple or omit them if alt text already covers the description.

7. How do I check if my website has missing alt text?

The most efficient method is to run a technical SEO audit using a tool like the SEO Analyzer Pro, which crawls your pages and flags images with missing alt attributes as part of its on-page audit. For manual checking, open any page in Chrome, right-click, select "Inspect," and search the HTML for img tags — review each for the presence and content of the alt attribute. Browser accessibility extensions like WAVE also visually highlight missing alt text directly on the rendered page.

8. Does alt text affect Core Web Vitals?

Alt text itself does not directly affect Core Web Vitals scores. However, the complete set of good image practices — which includes alt text as well as proper width/height attributes, compression, WebP format, lazy loading (except for LCP images), and correct sizing — collectively affects Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS). Undefined image dimensions cause CLS. Oversized or uncompressed images cause slow LCP. Building the habit of complete, correct image markup covers both alt text and the technical attributes that directly drive Core Web Vitals performance.

9. How does alt text affect AI-powered search like Google AI Overviews?

Google's AI Overviews use multimodal AI systems that read images and surrounding text as a single semantic entity rather than separate signals. Alt text contributes to the AI system's understanding of your page's topic and authority. Pages where images are accurately described in alt text — consistent with the surrounding content and page topic — give AI systems higher confidence in the page's topical relevance. This increases the probability of being cited in AI Overviews. Additionally, AI search platforms like Perplexity, Bing Copilot, and ChatGPT Search read similar semantic signals, making alt text relevant across the entire AI search ecosystem.

10. Is it a legal requirement to add alt text to images?

In many jurisdictions and contexts, yes. WCAG 2.1 and 2.2 — the international web accessibility standard referenced by most regulations — requires text alternatives for all non-decorative images (Success Criterion 1.1.1). In the United States, courts have applied the ADA to commercial websites, and missing alt text on key images has been the basis for successful accessibility lawsuits. The European Accessibility Act, which came into force in 2025, mandates accessibility compliance including alt text for digital products and services serving EU markets. Government and federally funded U.S. websites must comply with Section 508, which also requires alt text.

11. Should I write alt text for images in my PDF documents?

Yes — if you are creating accessible PDFs. Images embedded in PDF files can also have alt text descriptions applied through PDF creation tools like Adobe Acrobat Pro or InDesign. Accessible PDFs with described images perform better in document search and are required for regulatory compliance in contexts like WCAG-compliant PDF documents. If you are working with PDFs frequently, consider the full range of PDF management tools available, from merging PDFs and converting them to Word for editing, to ensuring your final documents meet accessibility standards.

12. What image format should I use alongside alt text for the best SEO results?

WebP is the recommended image format for SEO in 2026. It delivers 25–35% smaller file sizes than JPEG at equivalent visual quality, improving page load speed and Core Web Vitals scores — both ranking factors. AVIF offers even greater compression (50–70% smaller than JPEG) but requires a <picture> element with a JPEG fallback for older browsers. The free WebP Converter on SEO Tool Kit Pro converts any PNG or JPG image to WebP instantly, making it easy to prepare every image for optimal performance before uploading.