Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Suggest a starting-point alt text from an image's filename.
Suggests a readable starting point from the filename -- always review and refine it to actually describe the image.
Your suggested alt text will appear here.
This tool suggests a readable starting-point alt text by cleaning up an image's filename -- removing the extension, replacing hyphens/underscores with spaces, and capitalizing words. It is a filename-based heuristic, not an AI image-description tool -- it has no ability to see or describe what's actually in the picture, so always review and refine the suggestion to accurately describe the image's actual visual content.
Enter an image filename (e.g. blue-running-shoes-side-view.jpg). A cleaned-up alt text suggestion appears instantly -- edit it to accurately describe the actual image before using it.
The generator applies a short, predictable sequence of text edits. It removes the final file extension (the last dot and everything after it), replaces runs of hyphens and underscores with single spaces, and inserts a space wherever a lowercase letter is directly followed by an uppercase one, which splits camelCase names like redMountainBike. It then splits the result into words, drops empty pieces, capitalizes the first letter of every word, and lowercases the rest. The words are joined with single spaces.
Because every word is capitalized, the suggestion reads like a title, for example "Red Mountain Bike 2026" from red-mountain-bike-2026.jpg. Numbers stay as they are. Anything that is not a hyphen, underscore, or camelCase boundary is left alone, so a name with dots in the middle keeps them, and only the last extension is removed.
Take a hypothetical file named IMG_2041_kitchen-remodel_before.jpg. The tool strips the extension, turns the separators into spaces, and produces "Img 2041 Kitchen Remodel Before". Two things stand out. First, "Img 2041" is a camera-generated prefix that says nothing useful to a person who cannot see the photo. Second, "Before" only makes sense in context. A better final alt text might be "Kitchen with old oak cabinets before remodeling". The generator gave you a fast start by cleaning the words, and you supplied the parts only a person looking at the image could know.
The suggestion can only be as good as the name. Descriptive, hyphen-separated names such as blue-running-shoes-side-view.jpg produce a usable phrase immediately. Generic names such as photo1.png, screenshot.png, or IMG_0093.jpg produce generic suggestions that need to be rewritten from scratch. If you control the file naming, renaming images to describe their content before upload is a good habit: it improves the suggestion here, and clear filenames are easier to manage in a media library.
Alt text is read aloud by screen readers, shown when an image cannot load, and available to search engines as a text description of the image. For images that carry meaning, such as charts, product photos, diagrams, and screenshots that support a tutorial, accurate alt text is an accessibility requirement in the practical sense. For a chart, describe the main takeaway rather than every data point, and put detailed numbers in nearby text.
No -- it only works from the filename text you provide. It cannot see or analyze the image itself, so the suggestion is only as good as how descriptive the original filename was.
Treat it as a starting point only -- good alt text should accurately describe what's actually visible in the image for accessibility, which a filename alone often can't fully capture.
The tool lowercases the rest of every word after capitalizing its first letter, so an all-caps acronym like NASA becomes Nasa. Correct it manually in your final alt text.
No. It only cleans up the text of the filename and never analyzes the picture. If the filename is a camera code, write the description yourself or rename the file first.
No. Aim for a clear, brief description of what matters in the image. Long strings of keywords reduce usefulness for screen-reader users and can look like keyword stuffing.
Purely decorative images are commonly given an empty alt attribute so assistive technology skips them. Do not paste a generated suggestion into those.
Reference: Google Search Central