diff --git a/bundles/org.openhab.binding.pushover/README.md b/bundles/org.openhab.binding.pushover/README.md
index cda14becd3a43..312f9de43d6be 100644
--- a/bundles/org.openhab.binding.pushover/README.md
+++ b/bundles/org.openhab.binding.pushover/README.md
@@ -46,7 +46,7 @@ One has to pass a `null` value if it should be skipped or the default value for
 
 - `sendMonospaceMessage(String message, @Nullable String title)` - This method is used to send a monospace message.
 
-- `sendAttachmentMessage(String message, @Nullable String title, String attachment, @Nullable String contentType)` - This method is used to send a message with an attachment. It takes a local path or URL to the attachment (parameter `attachment` **mandatory**) and an optional `contentType` to define the content-type of the attachment (default: `image/jpeg`).
+- `sendAttachmentMessage(String message, @Nullable String title, String attachment, @Nullable String contentType)` - This method is used to send a message with an attachment. It takes a local path or URL to the attachment (parameter `attachment` **mandatory**). Additionally you can pass a data URI scheme to this parameter. Optionally pass a `contentType` to define the content-type of the attachment (default: `image/jpeg` or guessed from image data).
 
 - `sendURLMessage(String message, @Nullable String title, String url, @Nullable String urlTitle)` - This method is used to send a message with an URL. A supplementary `url` to show with the message and a `urlTitle` for the URL, otherwise just the URL is shown.
 
@@ -76,6 +76,16 @@ val actions = getActions("pushover", "pushover:pushover-account:account")
 actions.sendHtmlMessage("Hello <font color='green'>World</font>!", "openHAB")
 ```
 
+```java
+val actions = getActions("pushover", "pushover:pushover-account:account")
+// send message with attachment
+actions.sendAttachmentMessage("Hello World!", "openHAB", "/path/to/my-local-image.png", "image/png")
+actions.sendAttachmentMessage("Hello World!", "openHAB", "https://www.openhab.org/openhab-logo-square.png", null)
+actions.sendAttachmentMessage("Hello World!", "openHAB", "data:[<media type>][;base64],<data>", null)
+// in case you want to send the content of an Image Item (RawType)
+actions.sendAttachmentMessage("Hello World!", "openHAB", myImageItem.state.toFullString, null)
+```
+
 ```java
 val actions = getActions("pushover", "pushover:pushover-account:account")
 // send priority message
diff --git a/bundles/org.openhab.binding.pushover/src/main/java/org/openhab/binding/pushover/internal/connection/PushoverMessageBuilder.java b/bundles/org.openhab.binding.pushover/src/main/java/org/openhab/binding/pushover/internal/connection/PushoverMessageBuilder.java
index 5c77316e31273..5fa296ddab520 100644
--- a/bundles/org.openhab.binding.pushover/src/main/java/org/openhab/binding/pushover/internal/connection/PushoverMessageBuilder.java
+++ b/bundles/org.openhab.binding.pushover/src/main/java/org/openhab/binding/pushover/internal/connection/PushoverMessageBuilder.java
@@ -79,7 +79,7 @@ public class PushoverMessageBuilder {
     private @Nullable String urlTitle;
     private @Nullable String sound;
     private @Nullable String attachment;
-    private String contentType = DEFAULT_CONTENT_TYPE;
+    private @Nullable String contentType;
     private boolean html = false;
     private boolean monospace = false;
 
@@ -242,36 +242,26 @@ public ContentProvider build() throws PushoverCommunicationException {
         }
 
         if (attachment != null) {
-            if (attachment.startsWith("http")) {
-                RawType content = HttpUtil.downloadImage(attachment, 10000);
-                if (content == null) {
+            String localAttachment = attachment;
+            if (localAttachment.startsWith("http")) { // support data HTTP(S) scheme
+                RawType rawImage = HttpUtil.downloadImage(attachment, 10000);
+                if (rawImage == null) {
                     throw new IllegalArgumentException(
                             String.format("Skip sending the message as content '%s' does not exist.", attachment));
                 }
-                try {
-                    Path tmpFile = Files.createTempFile("pushover-", ".tmp");
-                    Files.write(tmpFile, content.getBytes());
-                    body.addFilePart(MESSAGE_KEY_ATTACHMENT, tmpFile.toFile().getName(),
-                            new PathContentProvider(contentType, tmpFile), null);
-                } catch (IOException e) {
-                    logger.debug("IOException occurred - skip sending message: {}", e.getLocalizedMessage(), e);
-                    throw new PushoverCommunicationException(
-                            String.format("Skip sending the message: %s", e.getLocalizedMessage()), e);
-                }
+                addFilePart(createTempFile(rawImage.getBytes()),
+                        contentType == null ? rawImage.getMimeType() : contentType);
+            } else if (localAttachment.startsWith("data:")) { // support data URI scheme
+                RawType rawImage = RawType.valueOf(localAttachment);
+                addFilePart(createTempFile(rawImage.getBytes()),
+                        contentType == null ? rawImage.getMimeType() : contentType);
             } else {
                 File file = new File(attachment);
                 if (!file.exists()) {
                     throw new IllegalArgumentException(
                             String.format("Skip sending the message as file '%s' does not exist.", attachment));
                 }
-                try {
-                    body.addFilePart(MESSAGE_KEY_ATTACHMENT, file.getName(),
-                            new PathContentProvider(contentType, file.toPath()), null);
-                } catch (IOException e) {
-                    logger.debug("IOException occurred - skip sending message: {}", e.getLocalizedMessage(), e);
-                    throw new PushoverCommunicationException(
-                            String.format("Skip sending the message: %s", e.getLocalizedMessage()), e);
-                }
+                addFilePart(file.toPath(), contentType);
             }
         }
 
@@ -283,4 +273,28 @@ public ContentProvider build() throws PushoverCommunicationException {
 
         return body;
     }
+
+    private Path createTempFile(byte[] data) {
+        try {
+            Path tmpFile = Files.createTempFile("pushover-", ".tmp");
+            return Files.write(tmpFile, data);
+        } catch (IOException e) {
+            logger.debug("IOException occurred while creating temp file - skip sending message: {}",
+                    e.getLocalizedMessage(), e);
+            throw new PushoverCommunicationException(
+                    String.format("Skip sending the message: %s", e.getLocalizedMessage()), e);
+        }
+    }
+
+    private void addFilePart(Path path, @Nullable String contentType) throws PushoverCommunicationException {
+        try {
+            body.addFilePart(MESSAGE_KEY_ATTACHMENT, path.toFile().getName(),
+                    new PathContentProvider(contentType == null ? DEFAULT_CONTENT_TYPE : contentType, path), null);
+        } catch (IOException e) {
+            logger.debug("IOException occurred while adding content - skip sending message: {}",
+                    e.getLocalizedMessage(), e);
+            throw new PushoverCommunicationException(
+                    String.format("Skip sending the message: %s", e.getLocalizedMessage()), e);
+        }
+    }
 }