diff --git a/core-server/server/routes/put-file.js b/core-server/server/routes/put-file.js
new file mode 100644
index 000000000..3f351ec62
--- /dev/null
+++ b/core-server/server/routes/put-file.js
@@ -0,0 +1,51 @@
+/*\
+title: $:/core/modules/server/routes/put-file.js
+type: application/javascript
+module-type: route
+
+PUT /files/:filepath
+
+\*/
+"use strict";
+
+exports.method = "PUT";
+
+exports.path = /^\/files\/(.+)$/;
+
+exports.bodyFormat = "stream";
+
+exports.handler = function(request,response,state) {
+	var path = require("path"),
+		fs = require("fs"),
+		filename = $tw.utils.decodeURIComponentSafe(state.params[0]), 
+		basePath = path.resolve(state.boot.wikiPath,"files"),
+		fullPath = path.resolve(basePath,filename);
+	// Check that the filename is inside the wiki files folder
+	if(path.relative(basePath,fullPath).indexOf("..") === 0) {
+		return state.sendResponse(404,{"Content-Type": "text/plain"},"File '" + filename + "' not found");
+	}
+	// Create directory if needed
+	fs.mkdir(path.dirname(fullPath),{recursive: true},function(err) {
+		if(err && err.code !== "EEXIST") {
+			$tw.utils.error("Error creating directory for file " + fullPath + ": " + err.toString());
+			return state.sendResponse(500,{"Content-Type": "text/plain"},"Directory error");  
+		}
+		var stream = fs.createWriteStream(fullPath);
+		stream.on("error", function(err) {
+			$tw.utils.error("Error writing file " + fullPath + ": " + err.toString());
+			if(!response.headersSent) {
+				state.sendResponse(500,{"Content-Type": "text/plain"},"Write error");
+			}
+		});
+		stream.on("finish", function() {
+			if(!response.headersSent) {
+				state.sendResponse(204,{"Content-Type": "text/plain"},"");
+			}
+		});
+		request.on("error", function(err) {
+			$tw.utils.error("Error reading request for " + fullPath + ": " + err.toString());
+			stream.destroy();
+		});
+		request.pipe(stream);
+	});
+};
diff --git a/editions/tw5.com/tiddlers/releasenotes/5.4.0/#9075.tid b/editions/tw5.com/tiddlers/releasenotes/5.4.0/#9075.tid
new file mode 100644
index 000000000..068d4bd03
--- /dev/null
+++ b/editions/tw5.com/tiddlers/releasenotes/5.4.0/#9075.tid
@@ -0,0 +1,10 @@
+title: $:/changenotes/5.4.0/#9075
+description: Add PUT endpoint for file uploads
+release: 5.4.0
+tags: $:/tags/ChangeNote
+change-type: enhancement
+change-category: nodejs
+github-links: https://github.com/TiddlyWiki/TiddlyWiki5/pull/9075
+github-contributors: linonetwo
+
+A new WebServer API endpoint PUT `/files/<pathname>` that supports streaming uploads for large files.
diff --git a/editions/tw5.com/tiddlers/webserver/WebServer API_ Put File.tid b/editions/tw5.com/tiddlers/webserver/WebServer API_ Put File.tid
new file mode 100644
index 000000000..6cdd6434f
--- /dev/null
+++ b/editions/tw5.com/tiddlers/webserver/WebServer API_ Put File.tid	
@@ -0,0 +1,35 @@
+created: 20250603144839000
+modified: 20250603144839000
+tags: [[WebServer API]]
+title: WebServer API: Put File
+type: text/vnd.tiddlywiki
+
+<<.from-version "5.4.0">> Upload or update a [[static file|Using the integrated static file server]].
+
+```
+PUT /files/<pathname>
+```
+
+The body should contain the raw file content (binary or text).
+
+Parameters:
+
+* ''pathname'' - URI encoded path to the file
+
+Headers:
+
+* ''x-requested-with'' - must be set to `TiddlyWiki` in order for the request to succeed, unless [[WebServer Parameter: csrf-disable]] is set to `yes`
+* ''content-type'' - should be set to the appropriate MIME type for the file being uploaded
+
+Response:
+
+* 204 No Content
+*> `Content-Type: text/plain`
+* 403 Forbidden - if the file path attempts to access directories outside the files folder
+* 500 Internal Server Error - if there was an error creating directories or writing the file
+
+Notes:
+
+* The file will be created in the wiki's `files` directory
+* Parent directories will be created automatically if path is like `files/subdir/file.png`
+* Files are stored exactly as uploaded without any processing or validation, no tiddler will be created automatically