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alt-text-generator

An alt text generator helps you write descriptive alt attributes for images — short, content-aware text that screen readers announce and search engines use to understand the image. The ZTools Alt Text Generator lets you draft, review, and bulk-export alt text per image, with character-limit guidance (125 chars max for screen-reader friendliness), keyword-stuffing warnings, decorative-image detection (when alt should be empty), and CSV export of the image-URL → alt-text mapping for templates and CMS imports.

Use cases​

Adding alt text to existing images on a website​

Crawl your site, list images missing alt attributes, draft descriptive text for each, export the mapping. Improves SEO and meets WCAG AA accessibility standards in one pass.

Drafting alt text for blog post images during writing​

For each image you embed, draft alt text alongside the caption. The tool warns when you write past 125 characters or include obvious keyword-stuffing patterns.

Auditing alt text quality on a high-traffic page​

Existing alts often say "image1.png" or "hero" — useless for SEO and accessibility. The generator helps rewrite each into a proper description.

Generating CSV maps for bulk-import into a CMS​

When migrating a site, bulk-import alt text via CSV (image URL → alt text) into the new CMS. The tool exports in the standard column format most CMSes expect.

How it works​

  1. Add image URLs (one at a time, or bulk paste) — Each URL becomes a row in the editor.
  2. Draft alt text per image — Write a description focused on what's in the image and its function on the page (not "image of"). Live character count and quality flags.
  3. Quality flags surface in real time — Too long (>125 chars), too short (<10 chars), keyword stuffing detected, starts with "image of" or "picture of" (redundant for screen readers), uses filename as alt (e.g., "IMG_4523.jpg").
  4. Mark decorative images — Decorative images (visual flourishes, ornaments) should have empty alt (alt=""). The tool exports these correctly so screen readers skip them.
  5. Export the mapping — CSV (image URL, alt text), JSON, or copy as &lt;img&gt; tag snippets ready to paste into HTML.

Examples​

Input: Photo of a woman teaching a class on her laptop

Output: Alt: "Woman teaching an online programming class via laptop" — 51 chars, descriptive, no stuffing

Input: Decorative ornamental flourish at section divider

Output: Alt: "" (empty) — correctly marked as decorative; screen readers skip

Frequently asked questions​

How long should alt text be?

Aim for 80-125 characters. Screen readers cut off after ~125 chars; very short alt (<10 chars) usually lacks descriptive value. Be specific without becoming a paragraph.

Should I include the target keyword in alt text?

When natural, yes — alt text is a ranking signal for Google Images. But never stuff. "Red running shoes for marathon training" is fine; "running shoes running shoes red running shoes" hurts.

When should alt text be empty?

For purely decorative images (ornamental dividers, background flourishes, visual padding) — alt="" tells screen readers to skip. Empty alt is correct and required for decorative content; missing alt attribute is wrong (screen readers may announce the filename).

How is alt text different from a caption?

Alt is announced by screen readers and read by search engines; caption is visible to all users. They serve different audiences and should usually contain different (complementary) text — not duplicates.

Will the tool generate alt text automatically from the image content?

No — automatic image-recognition alt text is often generic ("a person standing"). The tool helps you write better alt text faster but does not replace human judgment about what matters in context.

Does the tool handle SVG images?

Yes — SVG &lt;img&gt; tags need alt just like raster images. Inline SVGs use &lt;title&gt; for accessibility instead.

Tips​

  • Describe what's in the image AND its function on the page — context beats pure description.
  • Avoid "image of" or "picture of" — screen readers already announce that it's an image.
  • Mark decorative images with empty alt (alt="") — required for accessibility.
  • Include keywords only when they're genuinely descriptive — never stuff.

Try it now​

The full alt-text-generator runs in your browser at https://ztools.zaions.com/alt-text-generator — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-05 · Author: Ahsan Mahmood · Edit this page on GitHub