Alt Text Checker
Paste your HTML and every image is checked for missing, empty, too short, file-name-based or duplicate alt texts. It runs entirely in your browser — no signup, no installation, and nothing you paste or drop leaves your device.
How to Check Image Alt Texts
This alt text checker analyzes every image in your HTML directly in the browser — your code never leaves your device. Paste the source of your page into the box, click Check Alt Texts, and the tool goes through each img tag in document order. It flags the alt text issues that hurt accessibility and SEO the most: a completely missing alt attribute, empty alt texts on images that are not decorative, descriptions that are too short to be useful or so long they get cut off, alt texts that just repeat the file name like image1.jpg, and the same alt text reused on several images. Descriptive, unique alt texts help screen reader users understand your images and give search engines the context they need to rank your page. No signup, no upload, no file limits — just paste, check, and fix.
Alt-Texte von Bildern online prüfen
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What is Alt Text Checker?
Alt Text Checker is a free online SEO tool built for SEO consultants, content teams and site owners. Paste your HTML and every image is checked for missing, empty, too short, file-name-based or duplicate alt texts In practice you paste your page HTML, run the check on every image, and then review the images flagged for missing, empty, short, file-name-based or duplicate alt text.
Because the analysis runs locally you can check unpublished pages, staging URLs and client sites without handing the markup to a third party.
How to use Alt Text Checker
- Paste your page HTML.
- Run the check on every image.
- Review the images flagged for missing, empty, short, file-name-based or duplicate alt text.
Alt Text Checker FAQ
Is Alt Text Checker free to use?
Yes. Alt Text Checker is completely free and needs no account, no trial and no payment details. Every feature on the page is available without limits.
Is my data uploaded anywhere?
No. Alt Text Checker runs entirely in your browser, so the text, file or number you enter never leaves your device.
Does Alt Text Checker work on a phone or tablet?
Yes. It works in any modern browser on desktop, tablet and phone. There is no app to install and no account to create.
How do I use Alt Text Checker?
Paste your page HTML. Run the check on every image. Review the images flagged for missing, empty, short, file-name-based or duplicate alt text.