Generate README badge Markdown with alt text

The generator returns complete Markdown, the underlying image URL, and the human-readable alt text as separate fields. It safely handles spaces, hyphens, underscores, punctuation, and Markdown-sensitive brackets, so the result remains structurally correct when labels describe real build jobs or release channels. Use the browser tool for a quick badge or call the deterministic API when documentation is assembled automatically.

Choose concise badge text that communicates status

A useful badge answers a small, specific question at a glance. Put the category on the left as the label, then put its current value on the right as the message. For example, a label such as build paired with a message such as passing is easier to scan than a long sentence compressed into one image. The generated alt text joins those values with a colon, giving screen-reader users the same basic relationship conveyed visually. Keep both values meaningful when read without color, because color alone should never carry essential status. The generator trims surrounding whitespace but preserves intentional wording and letter case. Empty labels and empty messages are rejected instead of producing a confusing image with a blank half. When a badge represents automation, prefer stable vocabulary across releases so diffs remain readable and people learn where to look. The returned alt_text field also lets a documentation pipeline inspect or reuse the accessible description independently of the finished Markdown string.

Understand how the Shields image URL is formed

Shields static badges encode the label, message, and color in an image path. That path has special separator rules: spaces become underscores, literal underscores are doubled, and literal hyphens are doubled so they cannot be confused with the separators between badge parts. Other punctuation is percent-encoded for a valid URL. This capability applies those transformations deterministically and returns the resulting URL alongside the Markdown. A hexadecimal color may be supplied with a leading hash, which is removed before the color becomes part of the path; named Shields colors such as brightgreen can be supplied directly. The service does not contact Shields or verify how a particular color name is rendered. It only generates the conventional image reference, which keeps execution fast, private, and suitable for offline documentation builds. Because no network request occurs, a successful result means the syntax was produced correctly, not that the remote image was fetched. You can therefore store the output in a template and let the eventual README viewer request the image normally.

Insert and automate the generated Markdown safely

Copy the markdown field into a README, pull request template, package page, or any Markdown document that permits remote images. The result uses the familiar image form with accessible text in square brackets and the Shields URL in parentheses. Brackets and backslashes inside the visible text are escaped so user-provided wording does not prematurely close the alt-text section. For an automated workflow, send the three input fields whenever you render documentation and write the returned markdown value at the intended location. Since the algorithm has no clock, randomness, state, or network dependency, identical inputs always produce identical output; this makes generated files stable in source control. Consider keeping badge placement and ordering in your own template rather than concatenating an entire README in this capability. It deliberately creates one badge item per request and does not edit repositories, inspect build results, or decide what a status should say. Those boundaries make failures explicit: upstream automation supplies the truth, while this generator handles only correct encoding and presentation.