---
title: "Changelog - October, 2025"
description: "Developer documentation for Topol's embeddable white-label email editor and landing page editor (beta). Get practical insights and guidance for integration and optimized user experiences."
url: https://docs.topol.io/changelog/2025-10.html
---

# Changelog - October, 2025

## New Features

Email API

### Convert JSON Template to HTML API

**A new API converts JSON templates directly into production-ready HTML** using the MJML rendering engine, so editor output drops into your own sending pipelines, automation workflows, or applications.

The API generates responsive HTML from saved JSON templates outside the editor. The MJML rendering engine keeps the output consistent with what users see inside the editor, and every conversion is authenticated through the **X-Secret-Key header**.

Three steps set it up:

1.  Read the full details in the **API documentation**: [Convert JSON to HTML API](https://docs.topol.io/email-editor/guide/operations/convertJson2Html.html)
2.  Get an **X-Secret-Key** to authenticate requests, following [How to Get Secret Key](https://docs.topol.io/email-editor/guide/how-to-get-secret-key.html)
3.  Send the JSON template data with the secret key in the request header; the response returns the rendered HTML.

## Improvements

Email UI/UX

### Automatic Image Format Selection in Image Editor

The Image Editor now detects transparency automatically. Transparent images save as PNG, non-transparent ones default to JPG, and the format can still be changed manually before saving.

Email Config

### Default Format for Merge Tags

Merge Tags now take default values, loaded automatically in the Preview and used in the template. They remain adjustable directly in the Preview. For configuration details, see [this documentation](https://docs.topol.io/email-editor/guide/merge-tags.html#default-merge-tag-values).

Email Block

### Automatic Product Feed Selection in Product Block

With a single Product Feed connected, inserting a Product Block now selects that feed automatically in the Feed dropdown. With multiple feeds, the selection stays manual.

Email Events

### New options to toggle editor features from custom UI buttons

New callable functions toggle editor panels from a custom UI: AI Chat (`TopolPlugin.toggleChatAI()`), Autosaves (`TopolPlugin.toggleAutosaves()`), and Comments (`TopolPlugin.toggleComments()`), fully replacing the default buttons. For specifics, see [this documentation](https://docs.topol.io/email-editor/reference/topol-plugin.html).

Email Config

### Option to position the Text Editor Toolbar at the bottom

The new `textEditorToolbarBottomPosition` option locks the Text Editor toolbar to the bottom of the editor window, resolving the case where the toolbar overlapped and blocked the template above the edited block. The toolbar can also sit left, right, or center of the bottom section. For details, see [this documentation](https://docs.topol.io/email-editor/guide/text-editor-configuration.html#positioning-the-toolbar-at-the-bottom-of-the-editor-window).

## Bugfixes

-   Email Resolved an issue where Merge Tag values defined only with the word "code" were automatically translated into the editor language.