We released EmEditor v25.4.3 today. This update focuses on stability and includes the following fixes—please keep your software current for the best experience:

• Resolved an issue where the Use OPENAI_API_KEY environment variable option in Chat with AI, as well as the Copy to New Document command, might fail to work (ChatAI plug-in required).
• Fixed a bug that could truncate part of the status bar.
• Corrected how NUL character codes are displayed in ASCII (binary) view on the Character Code Value command.
• Improved performance in several areas, including smoother horizontal scrolling in documents with very long lines.
• Prevented the Find/Replace search history from being cleared when Use editor font was enabled.
• Addressed user-reported issues (1).

If you use the Desktop Installer version, you can select Check for Updates from the Help menu to download the latest version. If this method fails, please download the latest version, and run the downloaded installer. If you use the Desktop portable version, you can go to the Download page to get the latest version. The Store App version can be updated through the (Microsoft Store after a few days.

Today, we are releasing EmEditor v25.4.1.

v25.4.1 includes the following bug fixes. Please make sure to always update to the latest version for stable operations.

• Added a Color Picker snippet to the default snippets.
• Added support for the Windows system code page being set to UTF-8.
• Fixed an issue that could cause unexpected behavior when specifying the Folder on the Options page of the Customize Macros dialog.
• Fixed an issue where, on the Advanced page of the Customize dialog, Find in Files might not work correctly when the Number of Threads was set to 1 and very large files were included in the search.
• Fixed an issue where, on the Advanced page of the Customize dialog, enabling the Use temporary files while editing option could cause problems when performing replacements in very large files.
• Fixed an issue where case-insensitive search/replace and Find/Replace in Files might not work correctly if the search string contained characters whose uppercase and lowercase forms have different byte lengths in UTF-8.
• Improved performance for some operations, including case conversion, case-insensitive sorting, and Find in Files.
• Fixed customer reported issues (1).

If you use the Desktop Installer version, you can select Check for Updates from the Help menu to download the latest version. If this method fails, please download the latest version, and run the downloaded installer. If you use the Desktop portable version, you can go to the Download page to get the latest version. The Store App version can be updated through the (Microsoft Store after a few days.

Today, we are releasing EmEditor v25.3.2.

v25.3.2 includes the following bug fixes. Please make sure to always update to the latest version for stable operations.

• The Markdown/HTML toolbar no longer appears automatically when an XML document is detected.
• Fixed a performance slowdown that occurred under certain comparison conditions.
• Fixed a slowdown when editing HTML or XML files that contain very long lines.
• Fixed a potential crash or freeze during Find in Files or Replace in Files.
• Fixed a potential regex issue with repeated lookahead/lookbehind searches.
• Fixed an incorrect prompt when closing only one side of a split window.
• Fixed an issue where line wrapping might fail when the Tab width was set to 1 space.
• Fixed an issue where changes on the CSV Formats page of the Customize dialog were not always saved.
• Fixed an issue that could prevent the ChatAI installer from launching.
• Fixed a potential crash when viewing a comparison.
• Fixed customer reported issues (https://www.emeditor.com/forums/topic/cell-toolbar-automatic-show-hide-inconsistent/).

If you use the Desktop Installer version, you can select Check for Updates from the Help menu to download the latest version. If this method fails, please download the latest version, and run the downloaded installer. If you use the Desktop portable version, you can go to the Download page to get the latest version. The Store App version can be updated through the (Microsoft Store after a few days.

We released EmEditor v25.3.0 today.

Generative AI Enhancements (ChatAI plugin required)

One of the biggest additions in v25.3 is enhanced generative AI support, developed by Makoto Emura. This release adds Google as a provider and supports OpenAI’s GPT‑5. EmEditor now also supports Tool Calling, which lets the AI invoke a limited set of built-in EmEditor tools. It’s similar to an AI agent, but restricted to tools that EmEditor exposes—hence the name “Tool Calling.” With this, you can run natural-language commands on the currently open document via the Chat with AI interface. For example, if you open a file with email addresses and type “Extract email addresses from this document” into the Chat with AI bar, EmEditor will extract them and create a new document.

To use Tool Calling, click the “Tools” button and ensure it’s highlighted in blue. You can also choose which tools are enabled on the Tool Calling page in Chat with AI settings.

The Chat with AI Settings and the AI Options page in the Customization dialog let you set Max tokens and Temperature (randomness). Previously, the default Max tokens was 4096, which could cause truncated output for reasoning-heavy models like GPT‑5. In this version, you can toggle Max tokens on or off. When it’s off, the provider’s default is used.

In Chat with AI Settings, you can also adjust Reasoning effort where supported. When Reasoning effort is off, the model’s default is used. Higher effort yields more reliable responses but can be slower. If you want the fastest replies, turn Reasoning effort on and select Minimal.

Sort by Similarity

EmEditor includes many sorting commands, and this version adds the ability to sort by similarity to the text on the current line or in the current cell. Similarity is calculated using the Levenshtein distance (edit distance) introduced in v22.0.0, with an option to ignore case. For example, if you have a CSV roster and search for Michael, placing the cursor on Michael and running Sort by Similarity will sort the list so close matches like Micheal and Mike appear first—making similar names easier to spot.

Markdown/HTML Toolbar

We’ve added HTML features to the Markdown toolbar introduced in v24.4 and combined them into a single Markdown/HTML toolbar. Markdown and HTML modes switch automatically. Opening a Markdown file and choosing Markdown settings or turning on Markdown Design Mode enables Markdown mode; opening an HTML file and choosing HTML settings enables HTML mode. Accordingly, the old HTMLBar plugin has been discontinued. The new HTML mode is more capable than HTMLBar. For example, the drop-down for Paragraph, Heading 1, Heading 2, and more automatically detects and shows the current style, and buttons like Bold, Italic, and Code reflect the current font state. If no text is selected and you click Bold, the word at the cursor becomes bold. Selecting the Bold command (Ctrl+B by default) while selecting text produces **text** in Markdown mode and <strong>text</strong> in HTML mode.

Performance and More

We continued optimizing startup performance in this release. The Extract Frequent Strings command is also significantly faster. In our tests, startup is 1.90× faster than v25.0, and Extract Frequent Strings is 1.42–4.44× faster than v25.2.

Other improvements include:

• Responding to a customer request, you can now add conditions to regex highlight strings with special keywords like (?#_text_c!=17) for more flexible highlighting.
• Extract Frequent Strings now respects filters and works on filtered content.
• Previously, the cursor position didn’t change after sorting. Now it moves to the corresponding item, making it easier to run the new Sort by Similarity followed by additional sorts within Advanced Sort.
• In addition to the Customize dialog, the Customize Macros dialog and Configuration Properties now show an asterisk (*) next to page titles that differ from default settings.

We also fixed issues found during the preview build. Starting with this version, the trial period before registration changes from 30 days to 7 days.

We hope both the Pro and Free editions meet your expectations. If you have questions, feature requests, or ideas, please contact us or post on the forum.

We appreciate your continued support of EmEditor.
— Yutaka Emura

For details, including major changes and screenshots, see “What’s New in Version 25.3.” (https://www.emeditor.com/text-editor-features/history/new-in-version-25-3/)

If you use the Desktop Installer edition, update from Help > Check for Updates. If that doesn’t work, download the latest version (https://support.emeditor.com/en/downloads/suggested) and run the installer. The Desktop Portable edition can be downloaded and updated here. The Store App edition will be available for download or update from the Microsoft Store in a few days.

Today, we are releasing EmEditor v25.2.2.

v25.2.2 includes the following bug fixes. Please make sure to always update to the latest version for stable operations.

• Fixed issues related to the Toolbar Buttons and Menus pages in the Customize dialog.

If you use the Desktop Installer version, you can select Check for Updates from the Help menu to download the latest version. If this method fails, please download the latest version, and run the downloaded installer. If you use the Desktop portable version, you can go to the Download page to get the latest version. The Store App version can be updated through the (Microsoft Store after a few days.