EmEditor v25.4.3 Released

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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.

EmEditor v25.4.2 Released

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We’ve just released EmEditor v25.4.2. This update delivers several important fixes and optimizations to keep your experience smooth and stable, so we recommend updating as soon as possible.

  • Added support for GPT-5.1 (the ChatAI plug-in is required).
  • Fixed occasional malfunctions in AI prompts (the ChatAI plug-in is required).
  • Fixed an issue that sometimes caused the status bar’s line/column display to be cut off.
  • Fixed a problem in the Large File Controller when using case-insensitive regular-expression filters.
  • Fixed an issue where the Keyboard page in settings could show an asterisk—as if it had been modified—even when the defaults were unchanged.
  • Fixed unexpected behavior triggered by double-clicking [+] in tree views like the Snippets and CommitList plug-ins.
  • Fixed a crash that could occur in the CommitList plug-in when double-clicking a directory in the Commit List pane after comparing commits.
  • Fixed a bug where undo could stop working after making a few box selections under low-memory conditions.
  • Adjusted the position of the balloon notification when opening EmEditor with a very large file.
  • Fixed an issue that made Find in Files extremely slow when symbolic links or junctions were involved.
  • Improved performance across multiple areas, including file opening, Find in Files, and horizontal scrolling on very long lines.

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.

EmEditor v25.4.1 Released

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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.

EmEditor v25.4.0 Released – Faster, More Robust, Snippets, and Chat with AI

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We’ve released EmEditor v25.4.0.

This update focuses first and foremost on speed. We optimized numerous parts of the code so that many actions now run faster, especially on CPUs that support AVX‑512. I used the Chat with AI feature to help write the new optimizations; it felt like having another excellent engineer at my side.

We also made classic, non‑AI optimizations. Find, Replace, Find in Files, and Replace in Files have been reworked to process UTF‑8 directly whenever possible, avoiding round trips to UTF‑16. Previously, Replace in Files on UTF‑8 converted to UTF‑16 and back; now replacements can happen directly on UTF‑8, eliminating conversion overhead. We also added a new Find in Files option: “Display File Names, Lines, and Matched Lines (truncate long lines),” enabled by default. Even when targets include very long lines (such as binaries), EmEditor now truncates output instead of printing entire lines for stable, responsive results. In our tests, Find, Replace, Find in Files, and Replace in Files were between about 2x and 6.5x faster.

Stability has also improved. Find in Files runs multithreaded, but searching many huge files at once could use a lot of memory. We now limit the number of threads that open very large files to reduce memory usage. If memory allocation fails, EmEditor automatically falls back to a lower‑memory, single‑threaded mode and retries the operation, lowering the chance of a crash.

After discontinuing the HTMLBar plug‑in in v25.3, some users missed the quick tag‑insertion buttons. In this release, you can define snippets directly in EmEditor and invoke them from menus, toolbars, or keyboard shortcuts. Execution is still handled by the Snippets plug‑in. To show the Snippets toolbar, go to View > Toolbars > Snippets. Create a snippet by dragging any text onto the Snippets toolbar, or define snippets via Customize > Snippets. For syntax details, see “To Use the Snippets Plug‑in” in the Help, or ask an AI for “EmEditor snippet syntax”.

Chat with AI (by Makoto Emura) has also received upgrades:

  • New Web Search option for certain models (such as GPT‑5) to retrieve current information (for example, train timetables).
  • New Text Verbosity control to adjust response length.
  • Option to use environment variables (for example, OPENAI_API_KEY).
  • Backend optimizations for better performance.

Note: To use AI features, including Chat with AI, install the ChatAI plug‑in separately.

We also fixed issues found during the preview build.

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 25.4.”

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.