Alta
Alta generates screen-reader-ready alt text from uploaded images and includes a checker for alt text problems on a page.
What Alta is
Alta generates screen-reader-ready alt text from uploaded images and includes a checker for alt text problems on a page. Users can add page context so a description reflects an image’s role. For charts and infographics, it can return short alt text, a longer description and an HTML data table. Alta says it flags labels or values it cannot read reliably rather than guessing, and can identify images that appear decorative. Uploads accept PNG, JPEG, WebP and GIF files up to 4 MB each. Alta says its output stays under 125 characters and follows WCAG 2.2 SC 1.1.1, while noting that people still need to review it. Images are processed in memory and are not stored, according to Alta. The free checker scans page HTML for missing, generic, duplicated or overly long alt text; generating fixes uses a daily quota or Pro license. The free plan allows 5 images per day, unlimited page scans, 3 styles and 13 languages without signup. Pro costs $29/yr and adds unlimited generation, bulk upload of 50 images at once, CSV export, commercial use and support.
Good
- Free plan includes unlimited page scans
- Supports four image formats
- Charts can include an HTML data table
- Images are processed in memory and not stored
- Pro includes bulk upload and CSV export
Watch out
- Free plan allows 5 images per day
- Uploads are limited to 4 MB each
- Human review is still needed
Who it suits
Alta suits site owners and content teams creating image descriptions or checking pages for alt text issues. Its context and chart outputs may be useful when images need descriptions tailored to their role or data.
Verdict
Alta combines image-based alt text generation with a page checker, and its free tier includes scanning without signup. Pro adds higher-volume generation and export tools for $29/yr.
Plans and prices
From Alta's own pricing page, checked 9 Oct 2001.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | 5 images/day · unlimited page scans · 3 styles · 13 languages · no signup · $0 |
| Pro | $29 a year | Unlimited generations · bulk upload (50 at once) · CSV export · commercial use · support · $29/year |
The facts
Each one read from Alta's own pages, with the date it was checked.
What it does
- Accessibility output
- Alta says its alt text is kept under 125 characters and follows WCAG 2.2 SC 1.1.1; it also says human review is still needed.checked 9 Oct 2001
- Charts and infographics
- For charts and infographics, Alta can return short alt text, a long description, and an HTML data table.checked 9 Oct 2001
- Context-aware output
- Users can provide page context so Alta can describe an image according to its function on the page.checked 9 Oct 2001
- Image input limits
- The upload accepts PNG, JPEG, WebP, and GIF images up to 4 MB each.checked 9 Oct 2001
- Image privacy
- Alta says images are processed in memory and never stored.checked 9 Oct 2001
- Page checker
- The free checker scans page HTML for missing, generic, duplicated, or overly long alt text, among other issues; generating fixes uses the daily quota or a Pro license.checked 9 Oct 2001
- Shopify workflow
- For Shopify, users generate alt text in Alta and paste it into each product image's ALT field, or bulk-process a catalog with Pro.checked 9 Oct 2001
- Uncertain results
- Alta says it flags labels or values it cannot read reliably instead of guessing, and can identify images that appear decorative.checked 9 Oct 2001
- What it does
- Alta generates screen-reader-ready alt text from uploaded images and offers a checker that scans a page for alt text issues.checked 9 Oct 2001
- WordPress workflow
- For WordPress, users paste generated alt text into an image's Alternative Text field in the media library.checked 9 Oct 2001
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