We released EmEditor v26.0.0 today.

To improve web page loading times, developers often “minify” JavaScript, CSS, and HTML by stripping out line breaks and spaces. Similarly, data formats like XML and JSON may be compressed into a single line to make them easier to process as a continuous stream, even if that hurts readability. Some types of scientific data are even more extreme—for example, genome sequences (A, T, G, C) can be stored as one uninterrupted string billions of characters long. Files like these are becoming more common, and we’ve frequently heard from users that they can slow EmEditor down. Because these files contain extraordinarily long single lines, they can significantly impact performance. In v26.0, we reviewed and optimized our internal code using multithreading and SIMD, and our tests show open/search/replace performance improvements of 2.2× to 666× compared to the previous version.

EmEditor has supported Unicode since its early days, but entering characters that are hard to type—such as uncommon kanji, foreign-language characters, or emoji—used to be awkward. You had to open Insert > Special Characters (Ctrl+Shift+I), enter a code value, insert the character, and repeat the process each time. In v26.0, we redesigned this dialog as a custom bar that can stay open while you work. It now also supports searching by Unicode name and Unicode block, displays results in a large, easy-to-read font, and can render color-capable characters (such as emoji) in color. For example, searching for “smiling” will return many smiling-face emoji.

The Character Code Value dialog (Ctrl+I) has also been updated to display characters in a large, color font, making complex characters and emoji easier to recognize.

Based on customer feedback, we expanded the Favorites feature. In addition to files, you can now register folders as favorites. Selecting a folder opens the Open File dialog so you can choose the file you want. We also improved drag-and-drop behavior: when you drag multiple files in from Explorer, EmEditor won’t add duplicates if the same file name (with no line/column specified) is already in the list.

Markdown commands for bold, italic, and code now work even when no text is selected. For example, if you run the Markdown Bold command with nothing selected and then start typing, the text you enter will be inserted as bold.

The Undo/Redo History dialog, which has long been available as a modeless window, has been converted into a custom bar. This makes it easier to keep the history visible in a convenient spot while you continue editing.

Makoto Emura enhanced his Chat with AI and Commit List plug-ins. In Chat with AI, we added a “+ File” button on the left side of the input box so you can upload a selected file to your prompt if you are using an OpenAI model. This not only makes it easier to send more content than you could by typing or pasting, but also lets you attach supported files such as HTML, PDF, and Word. This feature uses OpenAI’s file search feature. Uploading a file typically uses less tokens than pasting the entire file text to the chat. We also added the ability to search within chat history (past conversations). Note that AI features—including Chat with AI—require installing the separate ChatAI plug-in in addition to EmEditor.

In Commit List, we improved performance across multiple operations, including displaying the changes list and commit history.

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.

We appreciate your continued support of EmEditor.
— Yutaka Emura

For details, including major changes and screenshots, see “What’s New in Version 26.0.”

If you use the Desktop Installer edition, update from Help > Check for Updates. If that doesn’t work, download the latest version and run the installer. We expect the Microsoft Store release in the next few days. If you download the MSI directly, please confirm that the digital signature is signed by Emurasoft, Inc.

EmEditor v25.4.4 is now available. This release focuses on stability and includes the fixes listed below. We recommend updating to the latest version for the best experience.

• Updated certain status bar items so they activate only on double-click, helping prevent accidental actions.
• Fixed an issue where status bar tooltips (Read-Only Mode and other indicators) didn’t always appear when the related switch was turned off.
• Fixed cases where Highlight Matching Tag could be unreliable in large HTML files.
• Corrected behavior when opening a file that contains a NUL (NULL) character as a text file.
• Fixed a potential crash in Replace in Files under certain conditions.
• Fixed an issue affecting a Sync feature.
• Allowed the Outline Bar to appear even when filtering is enabled.
• Fixed a potential crash when filtering with an invalid number-range syntax.
• Fixed incorrect information that could appear in the Registration Information/About dialog under certain conditions.
• Fixed behavior when selecting Copy on the AI Prompts page in the Customize dialog.
• Fixed an issue where the UI could switch to Chinese (instead of English) when the Windows display language was set to an unsupported language.

If you’re using the Desktop Installer version, go to Help → Check for Updates to download the latest version. If that doesn’t work, please download the installer (emed64_25.4.4.msi) and run it.

If you download the MSI file directly, please verify that the digital signature is signed by “Emurasoft, Inc.”:

1. Right-click the downloaded file and select Properties.
2. Open the Digital Signatures tab.
3. Confirm the signer is Emurasoft, Inc.
4. Do not install the file under any circumstances unless the signer is Emurasoft, Inc.

EmEditor’s Update Checker automatically verifies the MSI signer and cancels the update if the signer is not Emurasoft, Inc.

Alternatively, you can verify the SHA-256 hash values using the following:

• emed64_25.4.4.msi: 09e884896467b8fa574b2adf22d792e039774b8fb1300ec26a59c951937eaa3c
• chatai64_25.4.4.msi: f4db8fe290d3d5d44bd08461da24f168a73b085c6d589687f41b0a9a820556e8

If you use the Desktop portable version, please visit the Download page to get the latest version. The Store App version can be updated through the Microsoft Store after a few days.

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.

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.