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About this tool
Convert HTML to JSP templates and convert JSP back to clean HTML with directives, EL placeholders, and asset path handling.
The HTML JSP Converter takes plain HTML and produces a JSP page — turning {{ placeholders }} into ${...} Expression Language, rewriting root-relative src, href and action attributes to ${pageContext.request.contextPath}/…, and prepending the page and JSTL core taglib directives when they are missing. Reversed, it strips the <%@ %> directives, rewrites <%= %> expressions and EL into {{ }} tokens, and demotes scriptlets, jsp:include and c:if / c:forEach blocks into HTML comments so the markup opens in a browser. It is aimed at Java web developers moving a static template into a Servlet/JSP app, or pulling a JSP back out for design work.
Open HTML JSP Converter on AltFTool — it loads instantly in your browser.
Paste your code or data sample into the workspace.
Pick the format, conversion, or analysis you need.
Copy the polished result straight back into your project.
Only genuinely root-relative paths are rewritten — http(s):, //, mailto:, tel:, data:, javascript: and # anchors are left exactly as written.
Scriptlets, jsp:include and JSTL tags become labelled HTML comments on the way back, so the logic that was there is still visible in the output.
The page and taglib directives are inserted only if the source has no <%@ page %> or c-prefixed taglib already, so re-running the conversion does not duplicate them.
Paste the HTML and run HTML to JSP. Placeholders such as {{user.name}} become ${user.name}, root-relative asset paths gain the ${pageContext.request.contextPath} prefix, and two directives are added at the top: the page directive with contentType text/html; charset=UTF-8 and the JSTL core taglib bound to prefix c.
Because a JSP deployed to a named context serves under /myapp, so a link written as /assets/css/app.css resolves to the wrong place. Prefixing with ${pageContext.request.contextPath} makes it correct whether the app runs at the root or under a context. Absolute URLs and mailto:, tel:, data: and # links are skipped.
They are not executed or translated — each <% ... %> block becomes an HTML comment reading 'JSP scriptlet removed:' followed by the collapsed code, and the count is reported as a warning. The same applies to jsp:include and to c:if, c:forEach and c:choose blocks, which become paired comments so you can see where each region began and ended.
It is a starting point, not a finished page. The tool rewrites markup and directives, but it cannot know which beans your EL expressions resolve against, whether JSTL is actually on the classpath, or that inline <script> blocks are safe — a warning is raised when script tags are present. Compile and run it in your container before shipping.
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