diff --git a/src/client/index.js b/src/client/index.js
index 4ba708e2..b63dc7e3 100644
--- a/src/client/index.js
+++ b/src/client/index.js
@@ -199,6 +199,13 @@ function createSimpleClient(serverUrl) {
         let image = isFilePath ? imageBuffer : imageBuffer.toString('base64');
         let type = isFilePath ? 'file-path' : 'base64';
 
+        let {
+          fullPage,
+          threshold,
+          properties: userProperties,
+          ...rest
+        } = options;
+
         let httpStart = Date.now();
         const { status, json } = await httpPost(
           `${serverUrl}/screenshot`,
@@ -207,8 +214,8 @@ function createSimpleClient(serverUrl) {
             name,
             image,
             type,
-            properties: options,
-            fullPage: options.fullPage || false,
+            properties: { ...rest, ...userProperties },
+            fullPage: fullPage || false,
           },
           DEFAULT_TIMEOUT_MS
         );
diff --git a/tests/sdk/client.test.js b/tests/sdk/client.test.js
index 6b53cbde..d7a8b1ba 100644
--- a/tests/sdk/client.test.js
+++ b/tests/sdk/client.test.js
@@ -377,6 +377,36 @@ describe('client/index httpPost integration tests', () => {
     assert.deepStrictEqual(req.body.properties, { browser: 'chrome' });
   });
 
+  it('flattens nested properties into top-level properties', async () => {
+    await vizzlyScreenshot('test', Buffer.from('data'), {
+      properties: { url: 'http://localhost:3000/page' },
+    });
+
+    assert.strictEqual(requests.length, 1);
+    assert.deepStrictEqual(requests[0].body.properties, {
+      url: 'http://localhost:3000/page',
+    });
+  });
+
+  it('excludes SDK options from properties', async () => {
+    await vizzlyScreenshot('test', Buffer.from('data'), {
+      fullPage: true,
+      threshold: 0.1,
+      properties: { url: 'http://localhost:3000' },
+      browser: 'firefox',
+    });
+
+    assert.strictEqual(requests.length, 1);
+    let { properties, fullPage } = requests[0].body;
+    assert.strictEqual(fullPage, true);
+    assert.deepStrictEqual(properties, {
+      browser: 'firefox',
+      url: 'http://localhost:3000',
+    });
+    assert.strictEqual(properties.fullPage, undefined);
+    assert.strictEqual(properties.threshold, undefined);
+  });
+
   it('sends Connection: close header to disable keep-alive', async () => {
     await vizzlyScreenshot('test', Buffer.from('data'));