AltPost – Free AI Alt Text, No API Keys

AltPost is an AI alt text generator for WordPress that creates SEO-friendly image alt text for new uploads and your existing media library. There is no API key to create and no OpenAI account to manage — AltPost Managed handles the AI for you.

Start free (60 images in your first month, then 15/month), then scale with bulk generation built for WooCommerce stores, publishers, agencies, and image-heavy WordPress sites.

AltPost also includes optional AI image renaming so generic files like image-1.jpg, IMG_1234.png, or DSC0001.jpg become clear, descriptive, SEO-friendly filenames as part of the same workflow.

Built by A63 Digital, a working WordPress agency in Dublin, Ireland.

Included in this free plugin

• Vision-based alt text — the AI actually sees and describes your images
• Optional AI renaming of generic filenames (e.g. image-1.jpg → descriptive-slug.jpg)
• Batch runner with Start / Pause / Stop controls
• Inline editable results table with debounced autosave
• Rollback to previous alt text with one click
• Filename-as-alt detection (treats IMG_1234.jpg as missing)
• Alt Text Health Score — 0–100 site score with issue filters
• Compliance Report export (Print/PDF + CSV) for alt text documentation
• WPML and Polylang compatible — alt text in every language of your site
• Batch history with one-click undo for entire runs
• Optional sync of alt text into post content (Gutenberg, classic, Elementor) — off by default
• WP-CLI: wp altpost scan, generate, and rollback
• Compatibility with major page builders (Gutenberg, Elementor, Beaver Builder, Divi, WPBakery, Bricks, Oxygen)
• Cache plugin support (WP Rocket, W3 Total Cache, LiteSpeed Cache, and others)

Use AltPost as an alt text checker: it scans your media library for images with missing alt text or filename-based placeholders such as IMG_1234.jpg, then lets you generate proper descriptions for those images in bulk.

Meaningful alt text is required under WCAG 2.1 and the European Accessibility Act (in force since June 2025). AltPost helps WordPress sites meet those accessibility requirements by generating accurate, human-readable alt text at scale.

Free tier (service credits)

New free registrations get 60 AI-generated images in their first calendar month, then 15 images per month after that — register your email during setup (no credit card required). Credits are enforced by the AltPost Managed API (api.a63.ai), not by locking PHP features inside this plugin.

AltPost Pro (separate plugin — not in this zip)

Advanced features (context-aware SEO alt text, background processing, Image Manager, Broken Image Scanner, title & description generation, higher monthly limits) ship in a separate AltPost Pro plugin from a63.ai/altpost. This WordPress.org build does not include those modules and does not gate them behind a license key.

External services

This plugin connects to AltPost Managed at https://api.a63.ai.

When you generate alt text, the plugin sends a request to https://api.a63.ai/api/altpost/v1/vision. Each request includes:

• the public URL of the image being described
• the requested quality tier, language, and maximum length
• your site URL and the plugin version (sent as request headers)

The service calls an AI vision provider on your behalf, tracks your monthly credit usage, and returns the generated text plus your remaining credits. Images are not retained after processing.

Free-tier users also submit a registration request to https://api.a63.ai/api/altpost/v1/register-free during setup. This sends your email address, site URL, plugin version, and optional marketing consent preference (opt-in only — not required to use the free tier).

• Terms of Service: https://a63.ai/terms-of-service/
• Privacy Policy: https://a63.ai/privacy-policy/