AI alt-text & captions for any image
Drop an image and get ready-to-use alt-text, an SEO caption, three wording variations and a tidy filename — on your device, free.
jpg · png · webp · gif
⚡ Batch describe Pro
Doing alt-text for a whole site, blog or product catalog? Batch mode describes many images at once and gives you an editable table plus one-click export — all still 100% in your browser, nothing uploaded.
- Drop a folder of images and describe them in sequence
- Edit every description inline, with the same length guidance
- Export CSV or JSON (filename → alt-text) for your CMS or spreadsheet
- Copy all as
<img>HTML in one click
Image Describer Pro one-time key
The single-image describer stays free and unlimited forever. Pro unlocks batch describing with CSV/JSON export for people who caption images in bulk — still entirely on your device.
Try it now with demo code AV-IMAGE-DESCRIBER-DEMO (or AV-ALL-DEMO for every AppVitamins app). A real key unlocks locally; your images still never leave this device.
Get the free Alt-Text & Image SEO checklist
A short pre-publish checklist — alt-text length, decorative vs informative images, filenames, captions and lazy-loading — used by indie site builders to keep images accessible and search-friendly.
Send me the checklistBetter accessibility and SEO, automatically
Good alt text makes images readable by screen readers and helps search engines understand your pages — but writing a description for every image is tedious, and that is exactly why so many sites ship images with empty alt attributes. Image Describer uses an AI vision-language model running inside your browser to describe any picture in a natural sentence you can use as alt-text or a caption. Your images never leave your device, there is no sign-up, and there is no per-image cost.
One image, four ready-to-paste outputs
Every description comes in four shapes so you can grab the one you need: a concise Alt text tuned for screen readers, a fuller Caption sentence, an SEO caption that folds in your focus keyword, and a clean, descriptive filename (search engines read filenames too). The text is always editable, a built-in length meter keeps you in the screen-reader-friendly range of about 125 characters, and three alternative wordings let you pick the phrasing that fits your page. One click copies the text, or a full <img src alt> HTML snippet.
Built for accessibility standards
Descriptive alt text is a core requirement of WCAG 2.1 and is referenced by ADA and Section 508 guidance for the web. Image Describer helps you draft compliant alt text fast, but AI is a first draft, not a rubber stamp: read each description, add context the model cannot see (a person's name, the point the image makes on the page), and remember that purely decorative images should use empty alt="" rather than a description.
Describe a whole catalog in one pass
If you maintain a blog, documentation site or online store, batch mode (a Pro extra) lets you drop a folder of images, describe them all, edit each line in a table and export the lot as CSV or JSON — ready to paste into WordPress, Shopify, a spreadsheet or your own CMS. Because everything runs locally, even a few hundred private product photos stay on your machine.
Part of a privacy-first toolkit
Image Describer is one of a family of on-device image tools: cut out backgrounds with BG Remover, shrink and convert pictures with SqueezeIMG, and merge, split or compress documents with PDFLocal. One AppVitamins pass unlocks the Pro extras across all of them.
Frequently asked questions
- What is image alt text and why does it matter?
- Alt text is a short written description of an image. Screen readers read it aloud so blind and low-vision users know what the image shows, and search engines use it to understand and rank your images — so it improves both accessibility and SEO.
- Are my images uploaded to a server?
- No. The vision model runs entirely inside your browser, so your images never leave your device. There is no account and no per-image cost.
- How long should alt text be?
- Aim for roughly 125 characters or fewer so screen readers can announce it without cutting off. The length meter turns green when you are in the recommended range.
- Can I describe many images at once?
- Yes — batch mode (a Pro extra) describes a whole folder, lets you edit every line, and exports CSV or JSON for your CMS or spreadsheet.
- Is the AI description always accurate?
- It is a strong first draft but can miss context, so read and edit each one before publishing. Every description is editable and offers three wording variations.