New Features - Introduce the filter feature in the file browser. - Introduce the “Insert comment delimiters after indent” option to the Edit settings pane. - Revert the “Append a space to comment delimiter” option to the Edit settings pane. - Add Russian localization. Improvements - Improve the algorithm to comment out block comments. - Ignore .git folders in the file browser. - Prevent moving focus to the editor when selecting a document in the file browser. - Update the Verilog syntax to support SystemVerilog. - Update the Swift syntax. Fixes - Fix an issue where the counts in the status bar are occasionally unavailable when the document is opened. - Fix an issue where the text fields in sheet dialogs don’t get focus when they appear.

Improvements - Improve the user interface details on macOS 26. - Enable the enhanced runtime security protections. - Ensure that the sidebar is always displayed when opening a folder document. - Improve the “Open with External Editor” button in file preview views to allow specifying the application to open. Fixes - Workaround an issue on macOS 26 where the editor’s scroller tracks have a different style compared to standard scrollers. - Fix an issue where the counts in the status bar are occasionally unavailable when the document is opened. - Fix an issue in the vertical text orientation where the line number view is tucked beneath the titlebar when the navigation bar is hidden. - Fix an issue in the multiple replacement window where the text selection is unexpectedly canceled. - Fix an issue where the editor in a document opened by replacing with a blank document doesn’t initially have focus. - Fix an issue in the Find All command where the result view doesn’t display the correct document title when the target document was created by replacing with a blank document. - Fix an issue where the line endings pop-up button doesn’t work when the document was opened in a blank document. - Fix an issue in the multiple replacement window where the sidebar can be collapsed. - Fix an issue where the syntax mapping conflict view cannot be closed.

Improvements - Change the default editor font size to 13 pt. Fixes - Fix an issue on macOS 15 where the horizontal scroller appears in editors even when setting lines to wrap. - Address a potential crash on macOS 26 that can occur when opening a document. What’s New in Version 6.0.2 Fixes - Fix an issue on macOS 26 where the application crashes by opening the Donation settings pane while a system theme color other than Multicolor is selected in the System Settings > Appearance. - Fix an issue where the theme setting changes unexpectedly when opening the Appearance settings pane after switching the system appearance mode. - Fix an issue where the indentation style detection doesn’t work.

Fixes - Fix an issue on macOS 26 where the application crashes by opening the Donation settings pane while a system theme color other than Multicolor is selected in the System Settings > Appearance. - Fix an issue where the theme setting changes unexpectedly when opening the Appearance settings pane after switching the system appearance mode. - Fix an issue where the indentation style detection doesn’t work.

Improvements - Avoid assigning the Shift+Return shortcut key for a snippet. Fixes - Fix an issue where the file browser doesn't show the entire filenames when the scroller slot is shown. - Fix an issue where the “Convert Indentation” commands don’t convert if no characters are selected. - Fix an issue where the input fields in the Find window accept rich text. - Fix an issue where folder documents can open multiple windows for the same folder. - Address a potential crash on macOS 26 that occurs when performing a keyboard shortcut. - Address a potential crash on macOS 26 that can occur when opening a document on an Intel-based Mac.

New Features - Support macOS Tahoe 26. Improvements - Change the system requirement to macOS Sequoia 15 and later. - Update the user interface on macOS 26 to the Liquid Glass style. - Update the application icon to the Liquid Glass style. - The options to highlight matching braces have been removed and they are now always highlighted. - Apply the text find highlighting to all split editors. - Move selected items to the Trash by the Delete action in the file browser. - Show also the file size of the previewed document in the status bar. - Display the numbers of registered items below the lists in the syntax editor. - Deprecate the feature to change the editor opacity per window. - Deprecate the feature of installing a custom theme by simply opening the file in CotEditor. - Deprecate the “Make Snake Case,” “Make Camel Case,” “Make Pascal Case,” “Hiragana to Katakana,” and “Katakana to Hiragana” commands in the Text > Transformations menu. - Deprecate the “Draw separator” option for the line number view on macOS 26. Fixes - Fix an issue where the “Convert Indentation” commands don’t convert indentation to the indent style that’s not the default. - Fix an issue where the Syntax toolbar menu is disabled when the toolbar is shown afterward. - Fix an issue where the size of the Multiple Replace window is not stored. - Fix an issue in the Dutch localization where the number of found items isn’t displayed in the Find window.

Improvements - Update the CSS and Go syntaxes to highlight more keywords.

Fixes - Fix an issue in CotEditor 5.2.1 where the text color in the text fields within the Find window appears black in the dark mode.

Improvements - Update the CSS syntax to highlight more keywords. - Update the JavaScript syntax to highlight placeholders in template literals. Fixes - Fix an issue where the state of the Text Replacement option in modes is not saved. - Fix an issue where shortcuts could be assigned in the Key Bindings settings to menu commands that perform multiple replacements, even though these shortcuts didn’t actually work. - Fix an issue where the font in the input fields of the Find window would occasionally be replaced by a fallback font. - Fix an issue where the options button in the advanced character count doesn’t work.

New Features - Allow adding and removing text encodings from the text encoding list, and enabling the handling of a wider range of encodings. - Add the Xcode Project syntax (.pbxproj). - Add the Metal syntax Improvements - Improve differentiation without color. - Update the CSS syntax to highlight more keywords. - Update the HTML syntax to highlight more keywords. Fixes - Fix an issue where opening a document with mixed line endings incorrectly unifies them to the dominant line ending when it is not LF. - Fix an issue where a document containing incompatible characters cannot be closed without lossy saving. - Fix an issue where the text encoding of restored documents could be incorrectly set to Unicode (UTF-8). - Fix an issue where the Option-Delete Forward shortcut deletes the previous word instead of the next word by the multi-cursor editing mode. - Fix an issue in the file browser where the order of renamed items remains unchanged. - Fix an issue where the cached settings remain unchanged after executing the “Reload All Theme,” “Reload All Syntax,” or “Reload All Definitions” commands.

Improvements - Update the HTML syntax to highlight ARIA attributes.

New Features - Enhance the content of the file preview view for the file browser. - Add the “Copy File Path” command to the File menu as an alternative to the “Show in Finder” command, which can be shown while pressing the Option key. Improvements - Update the CSS syntax to add new keywords (thanks to Karam!). - Improve the VoiceOver support in folder documents. - Improve the Spanish localization.

Fixes - Fix an issue where an existing document may unintentionally shift when a new document is opened.

Improvements - Keep syntax highlights by text selection in the Dark mode as well. Fixes - Fix an issue on CotEditor 5.1.4 where the insertion point rarely jumps to the nearest outline item when the outline inspector is shown.

Improvements - Enable the “text replacement” option by default in custom modes. Fixes - Fix an issue on CotEditor 5.1.3 where the app rarely becomes unresponsive when a save is performed. - Fix an issue where the document position doesn’t cascade from the previous document when opening a document while the app is inactive.

Improvements - Automatically insert a closing symbol also for single and back quotation marks when the “Automatically insert closing brackets and quotes” option is enabled. - Update the naming convention for duplicated files and folders in the file browser. - Discontinue appending the “copy” suffix to user settings, such as syntax definitions, when duplicating them. - Improve the syntax highlighting algorithm. - Update the Markdown syntax to improve the highlighting of code blocks. - Update the Go syntax to fix some highlighting keywords (thanks to Karam!). - Improve the stability. Fixes - Fix an issue in the Portuguese localization where the app crashes when attempting to duplicate an item in the file browser. - Fix an issue in CotEditor 5.1.2 where the line number view fails to update correctly under certain conditions.

Improvements - Switch the localized block name and the block name defined in Unicode by clicking the block name in the character inspector. - Revert the steppers to the font setting controls in the Appearance settings pane. - Remove the Script menu from the context menu. - Add a help tag for “Show Sidebar” menu item when the command is unavailable. - Update the CSS syntax to add new keywords (thanks to Karam!). - Update the Swift syntax to support highlighting regex literals. - Update the JSON syntax to include the .xcstrings file extension. Fixes - Fix an issue where multiple text insertion points persist as visible even when the document is made not editable.

Improvements - Just move the insertion point instead of inserting a new one when typing a quotation mark just before a quotation mark automatically inserted by the “Automatically insert closing brackets and quotes” option. - Update the Unicode block name list. Fixes - Fix an issue in the What’s New window where an unwanted beta label would appear even in stable versions.

New Features - Append the nearest unique ancestor folder name to the document title if multiple documents with the same name are opened. - The new “prevent editing” option that prevents documents from being unintentionally edited. - Introduce the new AppleScript parameter editable to document objects. - Introduce the --readonly (-r) option to the cot command-line tool to open documents as read-only. - Read input from the standard input when the cot command-line tool is used with the - option. - Display Finder tags in the document inspector and the file browser. - Add the “text replacement” option to the Mode settings to disable the future in the editor. - Add the PowerShell syntax. Improvements - Show an alert and abort the import of setting files if they are not in a valid format. - Declare CotEditor can handle folders. - Update the JSON syntax to include the .jsonl file extension. - Update the Fortran syntax to include the .cuf file extension. - Update the PHP syntax - Improve the VoiceOver support. - Improve the stability. - experimental: Improve the syntax highlighting algorithm for inline comments. Fixes - Fix an issue in the AppleScript support where the `print` command is ignored. - Fixed an issue in CotEditor 5.0.8 where the file path argument passed to CotEditor scripts is percent-encoded. - Fix an issue in the Appearance settings pane where the alert about potential non-monospace fonts keeps appearing even after changing only the font size. - Fix an issue where the Settings window is not accessible from the Window menu. - Fix an issue on macOS 15 where newly created documents are mispositioned when the frontmost document is tiled.

Improvements - Add missing localization of Unicode block names. Fixes - Fix an issue where the text fields in the syntax editor could restore the contents after the input under certain conditions. - Fix a potential crash that rarely occurs when interacting with the Quick Action bar.

New Features - Add `title` and `timestamp` options to the AppleScript’s `write to console` command. Improvements - Provide more Unicode information about the selected character in the document inspector. - Prevent the console from hiding when the app goes into the background. - Optimize the file browser’s performance when expanding a folder containing a large number of items. - Improve the trimming of whitespaces in the extracted outline labels. - Modify the syntax highlighting rule to extract strings in the form of “begin-end” string pairs, even if one of those is escaped. - Adjust the editor’s initial scroll position. Fixes - Fix an issue that the shortcut key for cycling through windows was not functioning correctly for certain input modes. - Fix an issue that the end point of a selection shifted after a hanging indent on a wrapped line when the line endings are CRLF and the selection is expanded using the Shift-↑ or Shift-↓ shortcuts. - Fix an issue that the insertion point rarely jumped to the nearest outline item when the outline inspector is shown.

New Features - Display information about the selected image in the preview view for the file browser. - Add the “Add period with double-space” option to the Mode setting options (deselected by default). - Add the toolbar item for Writing Tools to the toolbar customization options (only for macOS 15.2 and later and when the Writing Tools feature is available). Improvements - Allow insertion points only at the same number of wrapped lines by rectangular selection. - Allow selections only at the same number of wrapped lines by selecting the column up/down. - Update the document’s syntax based on the filename when renaming it in the file browser. - Always open a file as a plain-text document if its file extension or filename is determined by syntaxes. - Enhance the “Move Focus to Next/Previous Editor” commands to move the focus to the main editor if it’s outside the editors. - Update the default keyboard shortcuts for split editor-related commands. - Replace the “Open with External Editor” button with the “Show in Finder” button when the file selected in the file browser is alias. - Display the icon preview for a symbolic link selected in the file browser instead of showing a dialog. - Expand the draggable area in the Quick Action bar. - Update the JavaScript syntax to include the .mjs file extension. Fixes - Fix an issue that the application no longer automatically terminated when the app went to the background without open documents. - Fix an issue that the file browser showed nothing for folders containing broken links. - Fix an issue that the application became unresponsive when renaming a filename in the file browser that contained newline characters. - Fix an issue that the printing area in the print preview was trimmed when line numbers were drawn. - Fix an issue that the window height unexpectedly shrunk when opening a document with the vertical layout orientation from the file browser. - Fix an issue in the cot command that the --wait option relaunched CotEditor when the app was quit instead of closing the document. - Fix an issue in the cot command that the --wait option did not wait for the window to close if the application was not yet launched when running the command. - Fix an issue that undetermined text conversions were ignored when submitting in some dialogs.

Fixes - Fix crashing when opening the Print dialog.

Improvements - Update the Swift syntax to add @Bindable, @ViewLoading, and @WindowLoading attributes. Fixes - Fix an issue in the file browser that the actions in the Add button were disabled when the focus is out of the browser. - Fix an issue that the document window position was not saved in some cases. - Fix insertion format editors’ behavior in the Snippet settings.

Improvements - Expand folder items by double-clicking a folder row in the file browser. - Directly open .plist files from the file browser instead of previewing. - Improve alias file handling in the file browser. Fixes - Fix an issue that the application crashes when an editor is opened while the Font window appears. - Fix an issue that the document window size was not properly saved.