diff --git a/addons/im_livechat/__manifest__.py b/addons/im_livechat/__manifest__.py
index eab86ec678b..3837720eaa9 100644
--- a/addons/im_livechat/__manifest__.py
+++ b/addons/im_livechat/__manifest__.py
@@ -41,6 +41,7 @@ Help your customers with this chat, and analyse their feedback.
     'depends': ["mail", "rating", "digest"],
     'qweb': [
         'static/src/bugfix/bugfix.xml',
+        'static/src/components/composer/composer.xml',
         'static/src/components/discuss_sidebar/discuss_sidebar.xml',
         'static/src/components/thread_icon/thread_icon.xml',
     ],
diff --git a/addons/im_livechat/static/src/components/composer/composer.xml b/addons/im_livechat/static/src/components/composer/composer.xml
new file mode 100644
index 00000000000..5219522049e
--- /dev/null
+++ b/addons/im_livechat/static/src/components/composer/composer.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+    <t t-inherit="mail.Composer" t-inherit-mode="extension">
+        <xpath expr="//*[hasclass('o_Composer_buttonAttachment')]" position="replace">
+            <t t-if="!composer.thread or composer.thread.channel_type !== 'livechat'">$0</t>
+        </xpath>
+    </t>
+
+</templates>
diff --git a/addons/im_livechat/static/src/components/composer/composer_tests.js b/addons/im_livechat/static/src/components/composer/composer_tests.js
new file mode 100644
index 00000000000..cf488b14d97
--- /dev/null
+++ b/addons/im_livechat/static/src/components/composer/composer_tests.js
@@ -0,0 +1,75 @@
+odoo.define('im_livechat/static/src/components/composer/composer_tests.js', function (require) {
+'use strict';
+
+const components = {
+    Composer: require('mail/static/src/components/composer/composer.js'),
+};
+const {
+    afterEach,
+    afterNextRender,
+    beforeEach,
+    start,
+} = require('mail/static/src/utils/test_utils.js');
+
+QUnit.module('im_livechat', {}, function () {
+QUnit.module('components', {}, function () {
+QUnit.module('composer', {}, function () {
+QUnit.module('composer_tests.js', {
+    beforeEach() {
+        beforeEach(this);
+
+        this.createComposerComponent = async (composer, otherProps) => {
+            const ComposerComponent = components.Composer;
+            ComposerComponent.env = this.env;
+            this.component = new ComposerComponent(null, Object.assign({
+                composerLocalId: composer.localId,
+            }, otherProps));
+            delete ComposerComponent.env;
+            await afterNextRender(() => this.component.mount(this.widget.el));
+        };
+
+        this.start = async params => {
+            let { env, widget } = await start(Object.assign({}, params, {
+                data: this.data,
+            }));
+            this.env = env;
+            this.widget = widget;
+        };
+    },
+    afterEach() {
+        afterEach(this);
+        if (this.component) {
+            this.component.destroy();
+        }
+        if (this.widget) {
+            this.widget.destroy();
+        }
+        this.env = undefined;
+    },
+});
+
+QUnit.test('livechat: no add attachment button', async function (assert) {
+    // Attachments are not yet supported in livechat, especially from livechat
+    // visitor PoV. This may likely change in the future with task-2029065.
+    assert.expect(2);
+
+    await this.start();
+    const thread = this.env.models['mail.thread'].create({
+        channel_type: 'livechat',
+        id: 10,
+        model: 'mail.channel',
+    });
+    await this.createComposerComponent(thread.composer);
+    assert.containsOnce(document.body, '.o_Composer', "should have a composer");
+    assert.containsNone(
+        document.body,
+        '.o_Composer_buttonAttachment',
+        "composer linked to livechat should not have a 'Add attachment' button"
+    );
+});
+
+});
+});
+});
+
+});
diff --git a/addons/im_livechat/views/im_livechat_channel_templates.xml b/addons/im_livechat/views/im_livechat_channel_templates.xml
index 037ef048a00..5abff085ca9 100644
--- a/addons/im_livechat/views/im_livechat_channel_templates.xml
+++ b/addons/im_livechat/views/im_livechat_channel_templates.xml
@@ -29,6 +29,7 @@
         <template id="qunit_suite" name="livechat_tests" inherit_id="web.qunit_suite_tests">
             <xpath expr="." position="inside">
                 <script type="text/javascript" src="/im_livechat/static/src/bugfix/bugfix_tests.js"></script>
+                <script type="text/javascript" src="/im_livechat/static/src/components/composer/composer_tests.js"></script>
                 <script type="text/javascript" src="/im_livechat/static/src/components/discuss/discuss_tests.js"></script>
                 <script type="text/javascript" src="/im_livechat/static/src/components/thread_icon/thread_icon_tests.js"></script>
                 <script type="text/javascript" src="/im_livechat/static/src/components/thread_textual_typing_status/thread_textual_typing_status_tests.js"></script>