What is the SEAM file format?
.seam is a URL suffix associated with the JBoss Seam Framework for developing interactive web pages and applications. Rather than a file stored on disk, .seam is a servlet mapping - entries in web.xml route every *.seam URL to the Seam/JSF front-controller, which renders the underlying .xhtml Facelet or .jsp page and returns standard HTML to the browser. The actual source files on the server are Java-backed templates using JSF components and EJB3 beans. A Java application server such as JBoss/WildFly, Tomcat, or GlassFish is required to serve .seam requests - the client needs only a web browser. If you save a .seam page from a browser, what you receive is rendered HTML that opens in any browser like a regular .html file.
Seam technology was commonly used for creating dynamic web applications following the concept of RIA (Rich Internet Application). RIA applications allow users to interact with the app via a defined interface without reloading the whole page each time a user interacts with any page element. Such apps are typically single-page applications with one active rendering window used to deliver content. RIA apps load into the browser's memory and retrieve data from databases or APIs referenced by server-side Seam components; Seam paired with libraries like RichFaces to deliver AJAX-driven partial page updates within the JSF lifecycle.
Active development was halted when Red Hat discontinued Seam 3 around 2012; the ecosystem has since moved to CDI and Jakarta Faces, where .xhtml Facelets remain the standard view technology.
Security & safety
RISK: LOWVisiting a .seam URL is as safe (or unsafe) as visiting any web page - it returns HTML from a server, with no special file type to download. Normal web caution applies: only enter credentials or sensitive data on .seam pages served over HTTPS by a site you trust, since Seam apps are often internal business systems (the data shown, like a sales report, may be confidential). A saved .seam page is plain HTML and cannot run on its own; the usual risk is phishing pages dressed up as a familiar Seam application, not the .seam suffix itself.
Format details
in a nutshellPrograms that open SEAM files
Windows1 app
Web browser (Chrome, Edge, Firefox)
Free Open the .seam URL in any browser - the server returns a normal web page. If you saved a .seam to disk, double-click it; it opens as HTML. 
macOS1 app
Web browser (Safari / Chrome / Firefox)
Built-in Open the .seam link in a browser, or open a saved .seam page (it's HTML) in Safari/Chrome/Firefox. 
Linux1 app
Web browser (Firefox / Chrome)
Open-source Open the .seam URL in any browser; a saved .seam page opens as HTML.
Any web browser
Free A .seam address is meant to be visited in a browser - there is no special viewer or download. Technical details
deep spec| Format type | URL pattern / servlet mapping - not a file stored on disk |
| Underlying view technology | JSF Facelets (.xhtml) or JavaServer Pages (.jsp) rendered server-side |
| Framework stack | JBoss Seam - integrates JSF (view layer), EJB3 (business logic), and JPA (persistence) |
| URL routing mechanism | *.seam pattern declared in web.xml dispatches requests to the Seam/JSF FacesServlet |
| Required server runtime | Java EE application server: JBoss/WildFly, Apache Tomcat + Seam, or GlassFish |
| Client requirement | Any web browser; no Java plugin or JVM needed on the client machine |
| HTTP response MIME type | text/html (default); application/xhtml+xml for strict XHTML output |
| Response character encoding | UTF-8 HTML/XHTML generated dynamically by the server |
| On-disk file signature | None - .seam is not a stored file; no binary structure or magic bytes exist |
| Framework status | Discontinued; Red Hat halted Seam 3 development circa 2012; Seam 2.x was the last active release line |
| Successor technologies | CDI (JSR-299/JSR-346), Jakarta Faces, Quarkus - all from the Red Hat/JBoss lineage |
| Conversation scope | @Conversation scope - stateful context spanning multiple HTTP requests within one browser session |
| Component model | Seam POJOs annotated with @Name, @In/@Out, or CDI annotations; minimal XML configuration |
| AJAX / RIA support | Partial page rendering via RichFaces or ICEfaces integration within the JSF component lifecycle |
| Released | 2005-2006 (JBoss Seam framework; built on JSF + EJB3) |
| Latest version | Seam 2.x (last active line); Seam 3 development was halted by Red Hat (~2012) |
| Specification | en.wikipedia.org |
SEAM conversions
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