diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index b1e86ff2643..90657b2e764 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -1469,7 +1469,7 @@ class Binary(http.Controller):
 
     @http.route('/web/binary/upload', type='http', auth="user")
     @serialize_exception
-    def upload(self, callback, ufile):
+    def upload(self, ufile, callback=None):
         # TODO: might be useful to have a configuration flag for max-length file uploads
         out = """<script language="javascript" type="text/javascript">
                     var win = window.top.window;
@@ -1481,11 +1481,11 @@ class Binary(http.Controller):
                     ufile.content_type, base64.b64encode(data)]
         except Exception as e:
             args = [False, str(e)]
-        return out % (json.dumps(callback), json.dumps(args))
+        return out % (json.dumps(callback), json.dumps(args)) if callback else json.dumps(args)
 
     @http.route('/web/binary/upload_attachment', type='http', auth="user")
     @serialize_exception
-    def upload_attachment(self, callback, model, id, ufile):
+    def upload_attachment(self, model, id, ufile, callback=None):
         files = request.httprequest.files.getlist('ufile')
         Model = request.env['ir.attachment']
         out = """<script language="javascript" type="text/javascript">
@@ -1519,7 +1519,7 @@ class Binary(http.Controller):
                     'id': attachment.id,
                     'size': attachment.file_size
                 })
-        return out % (json.dumps(callback), json.dumps(args))
+        return out % (json.dumps(callback), json.dumps(args)) if callback else json.dumps(args)
 
     @http.route([
         '/web/binary/company_logo',
diff --git a/addons/web/static/src/js/components/custom_file_input.js b/addons/web/static/src/js/components/custom_file_input.js
new file mode 100644
index 00000000000..eb9c4267cfc
--- /dev/null
+++ b/addons/web/static/src/js/components/custom_file_input.js
@@ -0,0 +1,88 @@
+odoo.define('web.CustomFileInput', function (require) {
+    "use strict";
+
+    const { Component, hooks } = owl;
+    const { useRef } = hooks;
+
+    /**
+     * Custom file input
+     *
+     * Component representing a customized input of type file. It takes a sub-template
+     * in its default t-slot and uses it as the trigger to open the file upload
+     * prompt.
+     * @extends Component
+     */
+    class CustomFileInput extends Component {
+        /**
+         * @param {Object} [props]
+         * @param {string} [props.accepted_file_extensions='*'] Comma-separated
+         *      list of authorized file extensions (default to all).
+         * @param {string} [props.action='/web/binary/upload'] Route called when
+         *      a file is uploaded in the input.
+         * @param {string} [props.id]
+         * @param {string} [props.model]
+         * @param {string} [props.multi_upload=false] Whether the input should allow
+         *      to upload multiple files at once.
+         */
+        constructor() {
+            super(...arguments);
+
+            this.fileInputRef = useRef('file-input');
+        }
+
+        //--------------------------------------------------------------------------
+        // Handlers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Upload an attachment to the given action with the given parameters:
+         * - ufile: list of files contained in the file input
+         * - csrf_token: CSRF token provided by the odoo global object
+         * - model: a specific model which will be given when creating the attachment
+         * - id: the id of the model target instance
+         * @private
+         */
+        async _onFileInputChange() {
+            const { action, model, id } = this.props;
+            const params = {
+                csrf_token: odoo.csrf_token,
+                ufile: [...this.fileInputRef.el.files],
+            };
+            if (model) {
+                params.model = model;
+            }
+            if (id) {
+                params.id = id;
+            }
+            const fileData = await this.env.services.httpRequest(action, params, 'text');
+            const parsedFileData = JSON.parse(fileData);
+            if (parsedFileData.error) {
+                throw new Error(parsedFileData.error);
+            }
+            this.trigger('uploaded', { files: parsedFileData });
+        }
+
+        /**
+         * Redirect clicks from the trigger element to the input.
+         * @private
+         */
+        _onTriggerClicked() {
+            this.fileInputRef.el.click();
+        }
+    }
+    CustomFileInput.defaultProps = {
+        accepted_file_extensions: '*',
+        action: '/web/binary/upload',
+        multi_upload: false,
+    };
+    CustomFileInput.props = {
+        accepted_file_extensions: { type: String, optional: 1 },
+        action: { type: String, optional: 1 },
+        id: { type: Number, optional: 1 },
+        model: { type: String, optional: 1 },
+        multi_upload: { type: Boolean, optional: 1 },
+    };
+    CustomFileInput.template = 'CustomFileInput';
+
+    return CustomFileInput;
+});
diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index 961c11cdc90..5470a721805 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -3,6 +3,21 @@
 
 <!-- Owl Templates -->
 
+<t t-name="CustomFileInput" owl="1">
+    <span class="o_file_input" aria-atomic="true">
+        <span class="o_file_input_trigger" t-on-click.prevent="_onTriggerClicked">
+            <t t-slot="default">
+                <button class="btn btn-primary">Choose File</button>
+            </t>
+        </span>
+        <input type="file" name="ufile" class="o_input_file d-none"
+            t-att="{multiple: props.multi_upload, accept: props.accepted_file_extensions}"
+            t-ref="file-input"
+            t-on-change="_onFileInputChange"
+        />
+    </span>
+</t>
+
 <t t-name="DialogButton.tooltip" owl="1">
     <div class="oe_tooltip_string" role="tooltip">
         <div class="tooltip-inner">
diff --git a/addons/web/static/tests/components/custom_file_input_tests.js b/addons/web/static/tests/components/custom_file_input_tests.js
new file mode 100644
index 00000000000..0131213f6e9
--- /dev/null
+++ b/addons/web/static/tests/components/custom_file_input_tests.js
@@ -0,0 +1,103 @@
+odoo.define('web.custom_file_input_tests', function (require) {
+    "use strict";
+
+    const CustomFileInput = require('web.CustomFileInput');
+    const makeTestEnvironment = require('web.test_env');
+    const testUtils = require('web.test_utils');
+
+    const { Component, tags, useState } = owl;
+    const { xml } = tags;
+
+    QUnit.module('Components', {}, function () {
+
+        // This module cannot be tested as thoroughly as we want it to be:
+        // browsers do not let scripts programmatically assign values to inputs
+        // of type file
+        QUnit.module('CustomFileInput', {}, function () {
+            QUnit.test("Rendering of all props", async function (assert) {
+                assert.expect(12);
+
+                class Parent extends Component {
+                    constructor() {
+                        super(...arguments);
+                        this.state = useState({ innerContent: '<a href="#">Trigger</a>' });
+                    }
+                    // Handlers
+                    _onFileUploaded(ev) {
+                        assert.strictEqual(ev.detail.files.length, 0,
+                            "'files' property should be an empty array");
+                    }
+                }
+                Parent.components = { CustomFileInput };
+                Parent.env = makeTestEnvironment({
+                    services: {
+                        httpRequest: (route, params) => {
+                            if (route === '/web/binary/upload') {
+                                assert.deepEqual(params, {
+                                    csrf_token: odoo.csrf_token,
+                                    ufile: [],
+                                });
+                                assert.step(route);
+                                return Promise.resolve('[]');
+                            } else if (route === '/web/binary/upload_attachment') {
+                                assert.deepEqual(params, {
+                                    id: 5,
+                                    model: 'res.model',
+                                    csrf_token: odoo.csrf_token,
+                                    ufile: [],
+                                });
+                                assert.step(route);
+                                return Promise.resolve('[]');
+                            }
+                        },
+                    },
+                });
+                Parent.template = xml`
+                    <CustomFileInput
+                        accepted_file_extensions="state.accepted_file_extensions"
+                        action="state.action"
+                        id="state.id"
+                        model="state.model"
+                        multi_upload="state.multi_upload"
+                        t-on-uploaded="_onFileUploaded"
+                        >
+                        <t t-raw="state.innerContent"/>
+                    </CustomFileInput>`;
+
+                const parent = new Parent();
+                await parent.mount(testUtils.prepareTarget());
+                const fileInput = parent.el;
+                const input = fileInput.querySelector('input');
+
+                // Default props
+                assert.strictEqual(fileInput.innerText.trim(), "Trigger",
+                    "File input total text should match its given inner element's text");
+                assert.strictEqual(input.accept, '*',
+                    "Input should accept all files by default");
+                await testUtils.dom.triggerEvent(input, 'change');
+                assert.notOk(input.multiple,
+                    "'multiple' attribute should not be set");
+
+                // Change props
+                Object.assign(parent.state, {
+                    accepted_file_extensions: '.png',
+                    action: '/web/binary/upload_attachment',
+                    id: 5,
+                    model: 'res.model',
+                    multi_upload: true,
+                });
+                await testUtils.nextTick();
+
+                assert.strictEqual(input.accept, '.png',
+                    "Input should now only accept pngs");
+                await testUtils.dom.triggerEvent(input, 'change');
+                assert.ok(input.multiple,
+                    "'multiple' attribute should be set");
+
+                assert.verifySteps(['/web/binary/upload', '/web/binary/upload_attachment']);
+
+                parent.destroy();
+            });
+        });
+    });
+});
diff --git a/addons/web/views/webclient_templates.xml b/addons/web/views/webclient_templates.xml
index 5cff8683427..bd297e6b616 100644
--- a/addons/web/views/webclient_templates.xml
+++ b/addons/web/views/webclient_templates.xml
@@ -288,6 +288,7 @@
         <script type="text/javascript" src="/web/static/src/js/widgets/pie_chart.js"></script>
         <script type="text/javascript" src="/web/static/src/js/widgets/ribbon.js"></script>
         <script type="text/javascript" src="/web/static/src/js/widgets/signature.js"></script>
+        <script type="text/javascript" src="/web/static/src/js/components/custom_file_input.js"></script>
         <script type="text/javascript" src="/web/static/src/js/apps.js"></script>
 
         <script type="text/javascript" src="/web/static/src/js/fields/abstract_field.js"></script>
@@ -715,6 +716,8 @@
                 <script type="text/javascript" src="/web/static/tests/chrome/user_menu_tests.js"></script>
                 <script type="text/javascript" src="/web/static/tests/chrome/systray_tests.js"></script>
 
+                <script type="text/javascript" src="/web/static/tests/components/custom_file_input_tests.js"></script>
+
                 <script type="text/javascript" src="/web/static/tests/widgets/company_switcher_tests.js"/>
                 <script type="text/javascript" src="/web/static/tests/widgets/data_export_tests.js"/>
                 <script type="text/javascript" src="/web/static/tests/widgets/domain_selector_tests.js"/>