Writing good alt text is part science, part craft. The science is understanding the rules. The craft is writing descriptions that feel natural, not mechanical. This guide gives you 15 real examples across different industries, plus a repeatable formula you can use for any image.
For most images, this structure works well:
[Subject] + [Action or State] + [Context/Setting] + [Relevant Detail]
Example: Woman (subject) reading (action) a book (object) in a coffee shop (context) with a latte on the table (detail)
Result: Woman reading a book in a coffee shop with a latte on the table
| Image | Weak Alt Text | Strong Alt Text |
|---|---|---|
| Blue trainers | shoes | Navy blue running trainers with white sole and mesh upper |
| Ceramic mug | mug product | Handmade terracotta ceramic mug with speckled glaze, 350ml |
| Laptop bag | bag | Black leather 15-inch laptop bag with padded shoulder strap |
| Image | Weak Alt Text | Strong Alt Text |
|---|---|---|
| Pasta dish | pasta | Creamy mushroom tagliatelle with parsley and parmesan |
| Cake slice | cake image | Slice of three-layer chocolate fudge cake on a white plate |
| Smoothie | drink | Green smoothie with spinach, banana and chia seeds in a glass jar |
| Image | Weak Alt Text | Strong Alt Text |
|---|---|---|
| Business meeting | people working | Diverse team of four professionals discussing project plans around a conference table |
| Sunrise landscape | nature photo | Golden sunrise over misty mountain valley with pine forest in foreground |
| Medical concept | doctor | Female doctor in white coat reviewing patient chart on digital tablet |
| Image | Weak Alt Text | Strong Alt Text |
|---|---|---|
| Living room | room | Bright open-plan living room with grey sofa, wooden floors and large bay window |
| Kitchen | kitchen photo | Modern white shaker kitchen with marble worktops and integrated appliances |
| Image | Weak Alt Text | Strong Alt Text |
|---|---|---|
| Person at laptop | computer | Young woman working on laptop at a minimalist home office desk |
| Infographic | chart | Infographic showing five steps to improve website loading speed |
| Data chart | graph | Bar chart comparing average conversion rates across five e-commerce platforms in 2024 |
For a logo: AltTagsForImages.com logo — just the brand name plus "logo". No need for elaborate descriptions.
For a magnifying glass search icon: Search — describe the function, not the appearance.
If the image contains important text (like a promotional banner), include that text in the alt text: Banner text: 50% off all products this weekend only
| Character Count | Assessment |
|---|---|
| Under 50 | Often too brief — may miss important context |
| 50–100 | ✅ Sweet spot for most images |
| 100–125 | ✅ Fine for complex images like charts or detailed scenes |
| Over 125 | Screen readers may cut off — use a caption instead for longer descriptions |
Google's John Mueller has confirmed that alt text is one of the most important signals for ranking in Google Images. Pages with relevant, descriptive alt text consistently outrank pages with missing or generic alt text for competitive image search queries.
The practical impact: if you sell handmade jewellery and someone searches "handmade silver ring with turquoise stone" in Google Images, only images with alt text containing those specific terms will appear.
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