EmEditor v26.1.0 Released — Updated Certificate, Faster Performance and Enhanced AI Features

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We are pleased to announce the release of EmEditor v26.1.0.

In EmEditor v26.0, we introduced support for quickly opening extremely large files that consist of a single line with no newline characters. However, opening such files quickly is only useful if horizontal scrolling and editing remain responsive afterward. In v26.1, we have made additional performance improvements through algorithm changes, SIMD-based optimizations, and other enhancements, making horizontal scrolling and editing much smoother after these files are opened. We have also optimized many operations for large files that contain newline characters. The benchmark results shown in our documentation represent only part of our testing, but they demonstrate performance improvements of 1.34 to 6.06 times compared with the previous version. Many other operations have also been improved for better overall performance.

This release also includes improvements based on customer feedback. For example, when a file opened in EmEditor was modified by another application, reloading the file could fail if the external application had temporarily locked it. In v26.1, EmEditor now waits a few milliseconds before reloading, and if reloading still fails, the message box now includes a Retry button.

When saving multiple unsaved documents, there is an Apply to All option to the “Save changes?” message box. EmEditor now also remembers the initial state of this option.

In EmEditor v25.2 and earlier, sorting a file did not cause the document to scroll if you were viewing the beginning of the file. Starting in v25.3, we changed this behavior so that, after sorting, EmEditor would scroll to the new location of the line where the cursor had been before sorting. Although this was intended to be the correct behavior, we received feedback that it made EmEditor less convenient to use. Therefore, in v26.1, we added the The cursor moves to the correct position when sorting option and restored the original behavior by default. However, when using the Sort by Similarity command, the document may still scroll so that the cursor can move to the correct location.

EmEditor v26.1 includes several improvements to the ChatAI plug-in. In earlier versions, the AI Prompt feature allowed only one provider, such as OpenAI or Google, and one model, such as GPT-4 or Gemini 2.5 Flash, to be used for all prompts. This meant that if you wanted to use different providers or models for different prompts, you had to change the settings each time. In this version, the AI Prompts page in the Customize dialog box lets you choose a provider and model for each individual AI prompt. For example, you can ask the same question in quick succession using different providers or models and compare the responses. You can also set different Reasoning Effort, Text Verbosity, and Web Search options for each prompt.

Makoto Emura added support for the Anthropic provider in the Chat with AI plug-in, in addition to the previously supported DeepSeek, Google, OpenAI, and LMStudio/OpenAI-compatible providers.

The file upload feature, previously only supported with OpenAI, is now also available with the Google provider. Similarly, Tool Calling, previously only supported with OpenAI and DeepSeek, is now available with the Anthropic and Google providers.

We have also added a PowerShell tool to the Tool Calling feature. For example, if you ask, “Show me a list of files with the .md extension in the D:\Test folder,” EmEditor can display a list of Markdown files in that folder. Because PowerShell commands can affect important files, EmEditor displays a Confirm button before executing the command. The command runs only after you click Confirm, helping you use this feature safely.

When you run EmEditor’s Reset All Settings command, all previous Chat with AI history is also deleted. In this version, we have added Chat Import and Export feature. Before running Reset All Settings, you can export your chats to a file, then import them afterward to restore your previous conversations.

Please note that to use AI features, including Chat with AI, you must install the ChatAI plug-in in addition to EmEditor.

We also fixed issues found during the preview build.

We hope both the Pro and Free editions continue to meet your expectations. If you have any questions, feature requests, or suggestions, please contact us.

Thank you for your continued support of EmEditor.
— Yutaka Emura

For details, including major changes and screenshots, please see “What’s New in Version 26.1.”

If you use the Desktop Installer edition, you can update EmEditor by selecting Help > Check for Updates. If that does not work, please download the latest version and run the installer. We expect the Microsoft Store version to be available in the next few days. If you download the MSI installer directly, please confirm that the digital signature is signed by Emurasoft, Inc.