How long should alt text be?

8-15 words, under 125 characters. Long enough to describe the image meaningfully, short enough that screen readers do not truncate it. The AI calibrates to this range automatically — if your output is too long, edit it before pasting into your CMS.

Should I include "image of" or "picture of"?

No. Screen readers already announce the element as an image; "image of a dog" reads as "image, image of a dog" which is redundant. Jump straight to the description: "Golden retriever puppy in a grass field". The AI generated by this tool follows that convention.

Can I use this with the actual image, not just a description?

Yes — Upload Image is the default tab. The AI examines the image directly via vision API and writes alt text from what it sees. The Describe Image tab is for cases where you have a description in mind but no file handy. Both produce comparable quality output.

Should alt text contain my target keywords?

Naturally, yes. The AI weaves keywords from your context into the description without stuffing. Goal: a description that reads naturally to a human first, with relevant keywords woven in. "Sales funnel diagram showing five stages from awareness to conversion" outperforms "best sales funnel diagram software 2026".

Is the output good enough to use without editing?

Often, yes. For routine images (stock photos, screenshots, product photos), the AI gives you copy-paste output. For brand-critical or technical images, edit for voice and add details the AI could not know (specific people's names, internal product features, geographic context).

How does this differ from manual alt text writing?

Speed and consistency. Writing 50 alt texts manually takes 30+ minutes and the quality varies. AI gives you 50 in 5 minutes, with consistent length, tone, and keyword treatment. The AI does not know your brand voice as well as you do, but for 80% of images that is fine.

Will this help my Google Image Search rankings?

Yes, indirectly. Descriptive alt text helps Google understand the image and surface it for relevant queries. Not all images need to rank, but for blog hero images, infographics, and product photos, good alt text contributes to image search traffic. SEO impact is moderate — not as strong as title tag — but missing it is a common quick-win.

Should decorative images have AI-generated alt text?

No. Purely decorative images (background patterns, dividers, spacers) should have empty alt (alt="") so screen readers skip them. Use this generator only for content images that convey meaning. Setting alt text on decorative images creates noise for visually-impaired users.

How does file format affect upload?

JPEG, PNG, WebP, and GIF are supported. AVIF works on most browsers. SVG is supported but may produce less accurate descriptions because the AI parses the rendered raster, not the vector source. For SVG-heavy sites, manually write alt text or convert SVG to PNG before uploading here.

Why does the AI sometimes describe colors incorrectly?

Image compression can shift colors slightly, and the vision API works at moderate resolution. For brand-critical color descriptions ("our signature purple #623ce7"), edit the AI output to specify the exact color or hex value. For "blue dress" vs. "navy dress", the AI is usually accurate.

Can I batch-generate alt text for many images?

Not in this tool — one image at a time. For batch use, upload images to a CMS-managed pipeline, or use a script that calls the OpenAI/Anthropic vision APIs directly for each image. The browser tool is sized for ad-hoc use; a 100-image batch is better handled programmatically.

Is the uploaded image stored anywhere?

Briefly. The image is sent to our backend, which forwards to a vision API for analysis, then immediately discards. We do not retain images, do not train models on them, and do not log the file content. The alt text output is not associated with the image after the request completes.

Free SEO Tool

Free Image Alt Text Generator

Upload an image or describe the subject. Get screen-reader-friendly, SEO-aware alt text in under 5 seconds. Free, unlimited, no signup.

4.6on G2

4.8on Trustpilot

Used by 100,000+ creators and developers

What the Image Alt Text Generator does

Writing good alt text is more time-consuming than most teams admit. Each image needs a 8-15 word description that conveys the visual content, hints at relevant keywords, and reads naturally to a screen reader. Multiplied across a blog with hundreds of images, that is hours of work that often gets skipped or rushed.

This generator gives you the AI-powered version of that work. Upload an image and the vision AI describes what it sees. Or describe the subject in words and the AI crafts the alt text from your description. Both modes produce 8-15 word output in seconds, formatted for screen readers and SEO. Edit lightly for voice, paste into your CMS, move on.

How to write good alt text

Five steps from image to deployed alt text.

Upload or describe

Pick the Upload tab to use a real image, or Describe to type a subject in words.

Click Generate Alt Text

In about 5 seconds, the AI produces a screen-reader-friendly description in 8-15 words.

Review the output

Read aloud. Edit for brand voice or specific details the AI could not know.

Copy and paste

One-click copy. Paste into your CMS Alt text field, or directly into the <img alt="..."> in code.

Repeat for next image

For ad-hoc use, run image-by-image. For bulk, integrate via a script using the same approach.

When creators and developers use it

Six common workflows where the generator earns its keep.

Blog post image alt text

You wrote a blog post with 8 images. Manually labeling each takes 15 minutes. Drop each into the generator, edit briefly, paste into CMS. Saves 10+ minutes per post; scales over a year of weekly publishing.

E-commerce product photo descriptions

Hundreds of product photos need alt text. Run each through the generator with the product name in context. Get descriptive, keyword-aware alt text that helps Image Search and accessibility at the same time.

Stock photo library labeling

Your team uses Unsplash and Pexels but downloads bare files. Run each through the generator before uploading to CMS so every image has alt text from day one.

Accessibility remediation sprint

You ran the Alt Text Checker, got a list of 200 missing-alt images. Generate alt text for each (or batch via API), paste into CMS. Compliance gap closed in a day instead of a week.

Social media image captions

Twitter, LinkedIn, and Instagram all surface alt text to screen readers. Generate alt for every social post image. Better accessibility, better engagement, more reach.

Documentation screenshots

Technical docs are heavy on screenshots. Generic alt ("screenshot") fails screen readers. Use this generator with explicit context ("dashboard with revenue chart") to get descriptive alt for every doc image.

Platform-specific setup guides

How to deploy AI-generated alt text on the CMSes most teams use.

WordPress

For new uploads: drop image in Media Library, generate alt with this tool, paste into the Alternative Text field, save.
For existing images, edit each in Media Library and add alt text.
For bulk operations, install Bulk Image Title Attribute or similar plugin to update via spreadsheet.

Webflow

In Designer, click any image element. Right panel has Alt text field.
For CMS-driven images, set alt as a Collection field and generate via this tool for each item.
Publish and verify with the Alt Text Checker.

Shopify

Product images: in admin, click product, click image, fill in Alt text using output from this generator.
Theme images: editor has alt fields per image; some are hardcoded in theme.liquid.
For bulk product imports, include alt text in the CSV upload (Image Alt Text column).

Ghost

In post editor, click any image. Modal has an Alt text field.
Generate via this tool, paste, save.
Featured images: post settings (gear icon) include alt text fields.

Next.js / React

Use <img alt="..." /> or next/image with the alt prop. Generate alt text via this tool while writing JSX.
For CMS-fetched images, store generated alt text as a required field on each asset.
Lint rules (eslint-plugin-jsx-a11y) catch missing alt at build.

Grigora vs. other alt text generators

A side-by-side of the alternatives.

Capability	Grigora	Copy.ai	Jasper	Free generators	Manual
Free + unlimited generations	Yes	Limited free	Free trial	Free, ad-supported	Manual only
Image upload + vision AI	Yes	Yes	Yes	Description only	Manual
Description-based fallback	Yes	No	Yes	Yes	Manual
Targets 8-15 word range	Yes	No	Yes	No	Manual
Screen-reader-friendly phrasing	Yes	Partial	Yes	No	Manual
Skip "image of" prefix	Yes	No	Yes	No	Manual
No signup	Yes	Account required	Account required	Yes	Yes
Multi-language	Yes	English only	Yes	English only	Yes

Common errors and how to fix them

Eight issues users hit with AI-generated alt text, and the exact fix.

Output describes the wrong subject

Cause: AI focused on a background element instead of the main subject.

Fix: Switch to Describe Image tab and explicitly say "main subject is X". Or edit the AI output to lead with the right subject.

Output is too long (200+ chars)

Cause: AI tried to capture every detail.

Fix: Cut to 8-15 words. Keep the most important detail; drop the rest. Or re-prompt with "in 10 words or fewer".

Output is too generic ("a photo")

Cause: Image was low-resolution or had unusual composition.

Fix: Use a higher-resolution version of the same image. Or switch to Describe Image and provide the context yourself.

Upload fails with "invalid file type"

Cause: File is HEIC, AVIF on an unsupported browser, or has a renamed extension.

Fix: Convert to JPEG or PNG using any free converter. Confirm the extension matches the actual file format.

Output contains my brand name in a wrong context

Cause: AI hallucinated a brand name from visual cues.

Fix: Remove the incorrect brand mention. AI sometimes pattern-matches logos to similar brands; always verify brand mentions in output.

Output uses awkward phrasing

Cause: AI translation or phrase patterns differ from your brand voice.

Fix: Edit for voice. AI gives you a draft; you finish it. Spend 30 seconds rewriting; the time saved vs. manual is still meaningful.

Same image gives different output across runs

Cause: Vision AI is non-deterministic; small variation per call is normal.

Fix: Pick the variant you like best. Or describe the image yourself for full control.

Output uses keywords that do not match my context

Cause: AI inferred a topic from visual cues that is wrong for your page.

Fix: Switch to Describe Image and provide the page context. The AI uses the context you provide to weave appropriate keywords.

Original data from our 2026 alt text generator usage

What we observed across 18,000 generations through the tool.

11.4

Average alt text length we generate (words)

Upload Image (68%)

Most-used input mode

34%

User edit rate before paste (does the user edit the AI output?)

90 sec

Median time saved per image vs. manual labeling

Frequently asked questions

Twelve answers covering what users ask us about AI alt text generation.

Related free tools

Other utilities that pair well with the Image Alt Text Generator.

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