What People Are Really Asking About Alt Text and Character Codes

The phrase “alt 124” refers to the ASCII code for the pipe character — the vertical bar produced on Windows by holding Alt and typing 124. It comes up in SEO discussions for two reasons. First, people use pipes as separators inside alt attributes and titles, then wonder whether Google understands them. Second, people worry that special characters, entity codes or unusual symbols inside an alt attribute might break parsing or damage indexing.

The reassuring answer is that Google reads alt attributes as plain text and handles standard characters, including pipes, dashes, commas and most punctuation, without difficulty. A pipe in your alt text will not break anything. But that is also the wrong thing to optimize. Google’s image understanding has moved far beyond literal string matching, and the real question is whether your alt text describes the image usefully to a human who cannot see it. Get that right and character trivia stops mattering.

How AAMAX.CO Can Help With Image SEO and Accessibility

Image optimization is one of the most consistently neglected areas we find during audits, and it is also one of the fastest to fix. At AAMAX.CO, our SEO services cover complete image SEO: descriptive filenames, human-quality alt text, modern formats and compression, responsive srcsets, lazy-loading configured so it does not block indexing, image sitemaps and structured data for products and recipes. We also review accessibility compliance at the same time, because alt text serves screen reader users first and search engines second. Since we increasingly optimize for AI-driven answer engines too, we apply the same discipline through our GEO services, making sure your visual content is described in ways machines can genuinely interpret. AAMAX.CO is a full-service digital marketing company working with clients worldwide across web development, digital marketing and SEO.

How Google Actually Processes Alt Attributes

Alt text serves several functions simultaneously, and understanding each clarifies how to write it.

Accessibility. Its original purpose. Screen readers announce alt text so blind and low-vision users understand what the image conveys. This is the primary audience and the correct mental model.

Fallback content. When an image fails to load, alt text displays in its place, preserving meaning.

Image search context. Google Images uses alt text, filename, surrounding page content, page title and structured data together to determine what an image depicts and which queries it should surface for.

Anchor text for image links. When an image is wrapped in a link, its alt text functions as the anchor text for that link. This is an underappreciated detail with real ranking implications for the destination page.

Topical reinforcement. Alt text contributes modestly to the page’s overall topical signals. Modestly is the operative word — it is a supporting element, not a lever.

Do Special Characters Cause Problems?

Practically speaking, no. Google parses HTML attributes and reads their string value. Pipes, hyphens, ampersands, quotes and accented characters are all handled. There are only a few genuine mechanical concerns.

Unescaped quotes break the attribute. If you place a raw double quote inside a double-quoted alt attribute, you terminate the attribute early and corrupt your markup. Escape it as " or use the opposite quote style.

Unescaped ampersands should be entities. Use & for reliability, even though most parsers recover gracefully.

Separator characters add no value. Writing alt text as a keyword list divided by pipes reads as spam to a human listener and adds nothing for a crawler. A screen reader announcing “SEO services, pipe, digital marketing, pipe, agency” is a terrible user experience.

Emoji and decorative symbols are noise. They are technically readable but almost never improve comprehension in an alt attribute.

Google’s Image Understanding Does Not Depend on Your Text Alone

This is the shift most people have not internalized. Google applies computer vision to images, recognizing objects, scenes, text within images via OCR, product attributes and more. It cross-references that visual interpretation with your alt text, caption, filename and surrounding copy.

Two consequences follow. First, misleading alt text is unlikely to fool anything — if the image is a chair and your alt text says “best running shoes,” the mismatch is detectable. Second, accurate alt text amplifies what the model already sees, adding the context vision cannot supply: brand, model, purpose, relationship to the page topic.

How to Write Alt Text That Actually Performs

Describe the image, not your keyword strategy. Close your eyes and ask what a person would need to know. Write that.

Aim for roughly 8 to 16 words. Long enough to be specific, short enough to be listened to comfortably.

Include the keyword only when it belongs naturally. If the image genuinely depicts the subject, the keyword appears without forcing.

Skip “image of” and “picture of.” Screen readers already announce that it is an image.

Use empty alt for purely decorative images. alt="" tells assistive technology to skip it. This is correct practice, not laziness — announcing every decorative divider is actively hostile to users.

Describe function for functional images. An icon button’s alt text should state what it does, such as “submit search,” not what it looks like.

Describe the data for charts. Summarize the takeaway in alt text, and provide the underlying figures in nearby body copy or a table.

Keep filenames descriptive too. Hyphenated, lowercase, meaningful. A filename like a random string wastes a free signal.

The Broader Image SEO Checklist

1. Serve modern formats. WebP or AVIF with appropriate fallbacks reduces file size dramatically.

2. Size images to their display dimensions and use responsive srcset attributes so mobile users are not downloading desktop assets.

3. Always set width and height to prevent layout shift, which protects your Core Web Vitals.

4. Do not lazy-load above-the-fold images. Your largest contentful paint element should load eagerly with high fetch priority.

5. Provide an image sitemap if visual discovery matters to your business.

6. Add structured data for products, recipes and articles so images qualify for rich results.

7. Keep images crawlable. Do not block your image directories in robots.txt, and confirm CDN URLs are accessible.

8. Use captions where they help. Captions are read by users and provide additional context that alt text alone cannot carry.

Final Verdict

Google understands alt text including standard special characters, so a pipe or any other ordinary symbol will not harm you. What harms you is treating alt attributes as keyword storage instead of descriptions. Write alt text for the person who cannot see the image, keep your markup valid, optimize the technical delivery of your images, and image search visibility follows as a byproduct of doing the job properly. If you want a systematic review of every image on your site, we can handle it.