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Kate (text editor)
Kate (text editor)
from Wikipedia
Kate
DeveloperKDE
Initial release2001; 24 years ago (2001)
Stable release
25.08.0[1] Edit this on Wikidata / 14 August 2025
Repositoryinvent.kde.org/utilities/kate
Written inC++, Qt
Operating system
TypeSource code editor
LicenseLGPL-2.0-or-later, MIT[6]
Websitekate-editor.org Edit this at Wikidata

The KDE Advanced Text Editor, or Kate, is a source code editor developed by the KDE free software community. It has been a part of KDE Software Compilation since version 2.2, which was first released in 2001. Intended for software developers, it features syntax highlighting, code folding, customizable layouts, multiple cursors and selections, regular expression support, and extensibility via plugins. The text editor's mascot is Kate the Cyber Woodpecker.

History

[edit]
"Kate the Cyber Woodpecker" is the current mascot of Kate editor, designed by Tyson Tan in 2021[7] and replacing the earlier version designed in 2014.[8]

Kate has been part of the KDE Software Compilation since release 2.2 in 2001.[9] Because of KParts technology, it is possible to embed Kate as an editing component in other KDE applications. Major KDE applications which use Kate as an editing component include the integrated development environment KDevelop, the web development environment Quanta Plus, and the LaTeX front-end Kile.[citation needed]

Kate has won the advanced text editor comparison in Linux Voice magazine.[10]

As of July 2014, development had started to port Kate, along with Dolphin, Konsole, KDE Telepathy, and Yakuake, to KDE Frameworks 5.[11]

In 2022, the KDE text-editor KWrite was modified to use the same code base as Kate with deactivated features.[12]

Features

[edit]

Kate is a source code editor that features syntax highlighting for over 300 file formats with code folding rules.[13][14] The syntax highlighting is extensible via XML files.[15] It supports UTF-8, UTF-16, ISO-8859-1 and ASCII encoding schemes and can detect a file's character encoding automatically.[citation needed] Kate offers code completion and reference finding for various programming languages through its Language Server Protocol Client plugin. The default configuration supports C, C++, D, Fortran, Go, Latex, Python, Rust, and OCaml.[16]

Kate's main text editor widget is called KatePart, which is reusable under the terms of the LGPL version 2 license.[17] It must not be confused with the KParts, a KDE plugin framework for user interface components that Kate also uses.[18]

Kate can be used as a modal text editor through its vi input mode.[19]

Kate features multiple document interface, window splitting, project editing[20] and sessions to facilitate editing multiple documents. Using sessions, one can customize Kate for different projects by saving the list of open files, the list of enabled plug-ins and the window configuration.[21]

Kate includes the KDE terminal emulator Konsole through its Terminal Tool View plugin.[22] Since version 23.04, the terminal is also available on windows.[23]

The "quick open" feature allows searching opened files by name for quick recalling.[24] Line modification indicators highlight lines with unsaved changes and lines added in the current session.[25][26]

Being a KDE application, Kate transparently opens and saves files over all protocols supported by KIO libraries. This includes HTTP, FTP, SSH, SMB and WebDAV, among others.[citation needed]

As of September 2021, unlike Xed, Kate is equipped with a session manager which allows naming, saving, and restoring sessions, meaning a list of momentarily open file tabs. Saved sessions are stored as key-value-formatted *.katesession files into ~/.local/share/kate/sessions/.

Other features are a clipboard history with up to ten items, the ability to jump to a line number,[27] and source control integration using Git[28][29]

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia
from Grokipedia
Kate is a powerful, open-source multi-document developed by the KDE community, primarily targeted at programmers and advanced users for efficient code and text editing across platforms including , Windows, macOS, and BSD. It features for over 400 languages, , multi-cursor editing, and support for the (LSP) and Debug Adapter Protocol (DAP) to enable intelligent autocompletion, error detection, and debugging. Additional capabilities include a built-in terminal, vi input mode, integration, with folder-wide search, and extensibility through plugins and scripting, making it suitable for both lightweight editing and complex development workflows. Development of Kate began in fall 2001 under the leadership of Christoph Cullmann, with its first release included in 2.2, marking the start of over two decades of evolution as a core application. Since then, it has undergone significant enhancements, such as porting to in the early and ongoing updates for modern protocols like LSP integration introduced in later versions, reflecting the project's commitment to cross-platform compatibility and user extensibility. As of 2025, Kate remains actively maintained with regular releases, including version 25.08.3, and is available via official repositories, the , and community builds, positioning it as a versatile alternative to editors like Vim or VS Code within the ecosystem.

Overview

Description and Purpose

Kate is a multi-document, multi-view developed by the project, primarily designed for efficient general text editing and programming tasks. It supports handling multiple files simultaneously, making it suitable for managing complex workflows in and system configuration. The editor's primary purposes include code editing, configuration file management, and serving as a lightweight alternative to full integrated development environments (IDEs) for developers. It strikes a balance between simplicity and advanced functionality, allowing users to perform quick edits without the overhead of heavier tools. Kate targets programmers, system administrators, and users of the KDE desktop environment who seek a powerful yet accessible editing solution. It is closely related to KWrite, a simplified sibling application that shares its core codebase but omits some advanced capabilities.

Licensing and Platforms

Kate is released as free and open-source software under the governance of the KDE project, ensuring broad accessibility and community-driven development. The core KTextEditor framework, which powers Kate's text editing capabilities, is licensed under the GNU Lesser General Public License version 2 or later (LGPLv2+). Some components, such as certain plugins and utilities, fall under the GNU General Public License version 2 or later (GPLv2+), while others like the KSyntaxHighlighting library have been relicensed to the permissive MIT license to facilitate wider integration. This licensing structure allows for both proprietary and open-source derivatives, promoting reuse while protecting user freedoms. Kate provides native support across multiple operating systems, with Linux as its primary platform due to its deep integration with the desktop environment. It also runs on BSD variants, Windows—where official binaries and a package have been available since 2019—and macOS, leveraging the cross-platform Qt framework for consistent functionality. This Qt-based architecture, combined with KDE Frameworks, ensures portability and uniform behavior, such as handling diverse encodings and line endings across environments. Distribution occurs through various channels without proprietary restrictions, including the KDE Applications bundle for easy installation on supported systems. Users can obtain Kate via package managers like apt for Debian-based distributions, snap, and for broader compatibility, as well as through Homebrew or on macOS and on Windows. Source code builds are available from KDE's repository, enabling custom compilations for any supported platform. For enhanced portability on Windows, version 23.04 introduced integrated terminal support using qtermwidget, allowing seamless command-line interactions within the editor.

History

Origins and Early Development

The development of Kate originated in late 2000 when Christoph Cullmann proposed an advanced multi-document interface (MDI) version of the existing KWrite editor to its author, Jochen Wilhelmy, via email, aiming to overcome KWrite's single-document limitations while building on its text widget for syntax highlighting. With no initial response, Cullmann announced the project on the kde-devel mailing list in January 2001, seeking collaborators for an MDI text editor. This effort formalized in February 2001 with the creation of the [email protected] mailing list, where early discussions focused on design, coding styles, and enhancements, led by figures like Scott Manson and Waldo Bastian. The project began as a fork named KCEdit on SourceForge, later renamed Kant and then Kate (KDE Advanced Text Editor), emphasizing MDI support and enhanced syntax highlighting to better serve developers within the KDE ecosystem. Kate's first release integrated into the 2.2 on August 15, 2001, marking its official debut as a core KDE application. During the 3.x era from 2002 to 2008, the editor underwent rapid iterations by KDE volunteers, incorporating features like for collapsing code blocks and session management for saving and restoring document sets, which improved usability for complex editing tasks. These updates moved the project to KDE's CVS repository in 2001, enabling collaborative development and alignment with KDE's evolving framework. Early development was driven by KDE community volunteers, including Anders Lund, Michael Bartl, and Joseph Wenninger, with Waldo Bastian facilitating integration into KDE's infrastructure. Christoph Cullmann, who initiated the project, emerged as the long-term maintainer around 2003, overseeing its growth amid KDE's expansion in the early . Kate arose during this period to offer users a graphical, feature-rich alternative to command-line editors like Vim and , tailored for the .

Key Milestones and Releases

The porting of Kate to Frameworks 5 began in July 2014, with initial work on KTextEditor interfaces and KatePart to achieve Qt5 compatibility. This effort culminated in the Applications 15.12 release in December 2015, delivering improved performance and seamless integration with the updated software stack. In 2022, developers modified Kate's codebase to converge with KWrite, enabling KWrite to leverage Kate's features via toggles for a simplified, lightweight editing mode while maintaining separate applications. This unification reduced maintenance overhead without altering core functionalities. Kate's releases align with the KDE Gear cycle, employing a YY.MM versioning scheme—such as 21.12 for December 2021—with dedicated stable branches for ongoing bug fixes and minor updates. The 21.12 release in December 2021 incorporated a redesigned , Kate the Cyber Woodpecker, originally unveiled in April 2021 to refresh the editor's visual identity. KDE Gear 23.04, issued in April 2023, added support for an embedded terminal on Windows. Recent advancements include improved distribution in 2023, with statistics and updates ensuring better compatibility and automatic versioning for Windows users. At Akademy 2024 in , Kate's maintainer participated in discussions on project sustainability, and developers Dominik Haumann and Christoph Cullmann received the Best Application award for their work on Kate and related components, emphasizing long-term community-driven evolution. In October 2025, a podcast episode highlighted strategies for Kate's ongoing maintenance after over two decades of development. KDE Gear 25.08.0, released in August 2025, bolstered (LSP) stability with refinements including new language server support and fixes for root file detection, reducing disruptions during editing sessions. KDE Gear 25.08.3, released on November 6, 2025, added quality-of-life improvements to Kate, such as fixes for context toolview focus issues.

Features

Core Editing Capabilities

Kate provides robust for over 410 programming and markup languages, powered by the KSyntaxHighlighting framework, with definitions stored in XML files that allow for easy extension and customization. The editor automatically detects the appropriate syntax scheme based on the file extension or the shebang line in script files, enabling seamless highlighting without manual intervention. The editor supports a wide range of character encodings, including , UTF-16, ISO-8859-1, ASCII, and many others, with automatic detection upon file opening and on-demand conversion to ensure compatibility across different systems. Bi-directional text rendering is also included, facilitating proper display and editing of languages like and Hebrew that require right-to-left script support. Kate handles various line ending conventions, such as CR (Mac), LF (Unix), and CRLF (Windows), with automatic detection and configurable conversion options to maintain consistency in cross-platform workflows. It features multi-cursor editing, allowing users to place multiple cursors via keyboard shortcuts like Ctrl+Alt+Up/Down or Alt+Click with the mouse for simultaneous edits across lines. Search and replace operations support regular expressions for precise and substitution, while visual indentation guides—enabled through the appearance settings—display vertical lines to delineate nesting levels and improve code readability. Document management in Kate utilizes a multi-document interface with tabbed views for handling multiple files simultaneously, supporting horizontal and vertical splitting for side-by-side editing. Sessions can be saved and restored to preserve the open documents, window layout, and cursor positions across application restarts. The undo and redo system offers infinite steps, allowing extensive revision history without limits on the number of actions. Basic editing tools include on-the-fly spell checking with support for multiple dictionaries, automatic bracket matching that highlights corresponding pairs upon insertion, and code folding to collapse or expand sections of text for better navigation in large files.

Advanced Tools and Integrations

Kate provides context-aware autocompletion that suggests completions based on the current file's content and syntax, accessible via Ctrl+Space, enhancing coding efficiency without requiring external plugins for basic functionality. This feature integrates with the (LSP) for more advanced, language-specific suggestions, including symbol navigation and API documentation lookup, where supported servers provide contextual hints and definitions. The symbol viewer tool displays an outline of functions, classes, and variables in the current document, allowing quick navigation to declarations via a sidebar view. For , Kate includes built-in Git integration that enables viewing file history, blame annotations, and inline diffs directly within the editor, streamlining workflow for developers. Users can access commit views, stage changes, and create branches from the Git toolview, which annotates lines with author and commit information for easy tracking of modifications. The editor embeds a Konsole-based terminal since version 23.04, allowing seamless execution of commands alongside editing without switching applications; this integration supports multiple tabs and persists across sessions on and Windows platforms. For debugging, Kate offers GDB integration through its dedicated plugin, enabling setting breakpoints, inspecting variables, and stepping through code with a console and view, ideal for C/C++ development. Project management in Kate utilizes session-based organization, where users can save and restore file sets, window layouts, and configurations for specific workflows, facilitating quick resumption of complex projects. The built-in project view presents a file tree for opened directories, supporting build configurations via configurable commands and quick open functionality to rapidly access files by name or fuzzy search across the project. Kate maintains a 10-item clipboard history for quick access to recent copies, accessible via the Edit menu for pasting previous entries without external tools. Additionally, search history persists across sessions, allowing reuse of previous queries in the incremental search bar to expedite repeated find operations.

User Interface and Customization

Kate employs a flexible multi-document interface (MDI) that allows users to manage multiple files simultaneously through tabbed windows, enabling efficient switching between documents via keyboard shortcuts such as Alt+Right and Alt+Left. The editor supports horizontal and vertical splitting of the editing area, facilitated by commands like Ctrl+Shift+T for horizontal splits and Ctrl+Shift+L for vertical ones, which permits viewing and editing multiple sections of the same or different files side-by-side. Detachable sidebars provide access to tool views, such as the built-in filesystem browser, which can be toggled and repositioned via the View menu or right-click options to suit individual workflows. Visual customization in Kate integrates seamlessly with the Breeze theme, offering default light and dark schemes that can be modified for personal preference. Users can create, edit, and import color themes through the Settings → Configure Kate → Editor Component dialog, adjusting elements like background colors, text selection highlights, and syntax-specific styles, with themes saved as files in the user's local directory. Font selection and sizing are handled via System Settings, allowing global or application-specific adjustments, while icon sets for toolbars and sidebars can be customized in the respective view configurations. Additionally, Kate includes a VI input mode for modal editing, accessible via Edit → Input Modes, which emulates Vim-like commands for users accustomed to terminal-based workflows. Key bindings in Kate are fully configurable through the Settings → Configure Keyboard Shortcuts menu, where users can remap actions to match preferred schemes, including partial emulations of Emacs and Vim behaviors by importing or defining custom sets. This extensibility supports a range of input paradigms, from standard KDE shortcuts to modal VI operations, enhancing productivity without requiring external tools. Accessibility features in Kate leverage Qt's built-in support for high-contrast modes, which can be enabled system-wide in KDE Plasma to improve readability for low-vision users by amplifying color differences in themes and UI elements. Screen reader compatibility is provided through Qt's AT-SPI integration, allowing tools like to navigate and announce editor content, menus, and dialogs when QT_ACCESSIBILITY=1 is set. UI scaling is adjustable via KDE Plasma's display settings, applying fractional scaling to Kate's interface for better usability on high-DPI screens. Session management ensures persistence across restarts by saving open files, window layouts, split views, and tool configurations under named sessions, accessible via the Sessions menu for quick restoration or switching between projects. This feature maintains user-defined arrangements, such as sidebar positions and document splits, automatically upon closing if configured, facilitating seamless resumption of work.

Development and Community

Technical Architecture

Kate is constructed primarily using the Qt framework for its graphical user interface, ensuring a responsive and native-looking experience across supported platforms. The core editing functionality relies on the library from Frameworks, which provides a robust text buffer, , and advanced editing primitives written predominantly in C++. This separation allows Kate to leverage KDE's ecosystem while maintaining a lightweight standalone application. The architecture emphasizes modularity through the KPart component system, enabling the editor to be embedded as a reusable part in other applications, such as the web browser, without duplicating code. At its foundation, Kate distinguishes between the user interface layer, the editor engine powered by KTextEditor, and extensible plugin components, promoting maintainability and flexibility. The KTextEditor handles text rendering and manipulation efficiently, supporting operations on files up to several gigabytes in size through optimized buffer management, though performance can degrade with extremely long single lines due to syntax highlighting overhead. Asynchronous processing is integrated for resource-intensive tasks, including multi-threaded searches across multiple files and communication with (LSP) servers for features like and diagnostics, preventing UI freezes during heavy computations. Cross-platform compatibility is facilitated by Qt's , which abstracts platform-specific details for rendering and input handling. On Windows, builds utilize as the compiler toolchain to produce native executables, with official installers available for seamless deployment. For extensibility, an internal JavaScript engine based on enables scripting for automation, such as defining custom commands or macros, integrated directly into the editor's action system. The KTextEditor component itself is licensed under LGPL, allowing its reuse in both open and proprietary software.

Plugins and Extensibility

Kate's plugin system enables users to extend its functionality dynamically, allowing plugins to be loaded and unloaded at runtime without restarting the application. Built on Frameworks and Qt, the system integrates plugins through a dedicated configuration interface accessible via Settings → Configure Kate... → Plugins, where users can enable, disable, or install new ones. Plugins are categorized broadly into areas such as editor enhancements (e.g., syntax and completion tools), user interface modifications (e.g., session ), and utility tools (e.g., build and aids), ensuring modular additions that do not alter the core editor. This framework supports over 20 bundled plugins in official releases, emphasizing lightweight extensions to maintain performance. A key component is the built-in Language Server Protocol (LSP) Client plugin, which provides advanced language-specific features like diagnostics, refactoring, code navigation, and autocompletion by interfacing with external LSP servers. It supports languages including C/C++, Python, , Go, , , and out of the box, with extensibility to others such as , , and through user configuration of server paths. The plugin integrates seamlessly for features like inlay hints and reference finding, enhancing Kate's suitability for programming without requiring separate IDEs. Notable bundled plugins include the SQL execution tool, which allows creating databases, connecting to existing ones, and running queries directly within the editor; the Snippets manager, enabling reusable code or text templates for rapid insertion via triggers; the Build plugin for compiling projects; and the GDB integration for sessions. Community-contributed plugins, such as a previewer that displays rendered views in the sidebar for .md files, extend these capabilities further and are available through the store. While Kate includes robust built-in regex support for search and replace, advanced regex tools can be augmented via custom plugins. Plugins are primarily bundled with Kate releases and installed via system packages, but additional ones can be obtained directly in the application using the "Get New Plugins" option, which leverages KNewStuff for downloading from the KDE store. For custom development, the API primarily uses C++ with Qt and KDE Frameworks, as detailed in official tutorials for creating plugins like sidebars or actions; Python support is available through a dedicated plugin framework for scripting and simpler extensions, though it requires enabling the Python Plugin manager. This approach keeps the core lightweight while allowing targeted enhancements.

Reception and Impact

Awards and Recognition

Kate has received several formal awards recognizing its capabilities as an advanced . In 2014, it won the advanced text editors category in Linux Voice magazine's group test, praised for its robust features and seamless integration with the desktop environment. In 2016, developers Dominik Haumann and Christoph Cullmann were awarded the KDE Akademy Award for their contributions to Kate and the underlying KTextEditor framework, highlighting the project's ongoing innovation and community impact. Expert reviews have positioned Kate as a strong alternative to popular editors like VS Code. A 2024 article in It's FOSS described it as a refreshing open-source option with comprehensive tools for both novice and experienced coders, emphasizing its multi-document support and extensibility. Similarly, in 2025, XDA Developers lauded Kate as an IDE-like replacement for VS Code, noting its cross-platform availability and built-in features such as language server protocol integration. Kate's long-term maintenance has been a notable milestone, with the project reaching 20 years of development in 2020, as celebrated in official announcements and blog posts that underscored its evolution into a mature, feature-rich tool. By 2025, this sustained effort was further recognized in a 'Besser Wissen' episode featuring maintainer Christoph Cullmann, which discussed the challenges and sustainability of upkeep for Kate. Media coverage has highlighted Kate's cross-platform viability and cultural elements. In a 2024 Hacker News discussion on its availability across platforms, users and commenters praised its performance and plugin ecosystem as a lightweight yet powerful option for developers. Additionally, the 2021 redesign of Kate's mascot—Kate the Cyber Woodpecker, created by artist Tyson Tan—has become a recognized within the community, symbolizing the editor's approachable and dynamic identity.

Usage and Comparisons

Kate serves primarily as a code editor for users within the ecosystem, supporting languages such as C++, Python, and others through features like and integration, making it suitable for tasks like editing Golang scripts or assembly on resource-constrained devices such as the . It is also commonly employed for secondary purposes, including editing configuration files and documents, where its multi-document interface and built-in terminal facilitate quick modifications without the overhead of full IDEs. Kate is widely adopted in major distributions, where it is available as a standard package in via APT or Snap, and in through DNF or Snap installations, often serving as the default in Plasma environments like or Spin. Its cross-platform availability has driven growing adoption on Windows and macOS; for instance, the 2025 Microsoft Store update enhanced its integration, allowing seamless use alongside native applications on non-Linux systems. In comparisons with terminal-based editors like Vim and , Kate provides a graphical user interface that lowers the entry barrier for users preferring mouse-driven navigation, while incorporating modal editing modes such as VI input for familiarity with keyboard-centric workflows. Against , Kate stands out as a lighter alternative with no built-in for user tracking, consuming fewer resources on modest hardware, though it offers a smaller of extensions compared to VS Code's vast . Relative to Gedit, the default , Kate delivers more advanced capabilities, including multi-cursor editing, , and tools, positioning it as a superior choice for complex syntax handling in programming tasks. Community feedback highlights Kate's rapid startup times and efficient handling of medium-sized files, earning praise for its balance of simplicity and power in everyday coding sessions. However, users have noted performance challenges with extremely large or minified files exceeding several megabytes, where lag can occur due to limits and rendering demands. Criticisms often center on its dependency on KDE Frameworks and Qt libraries, which can introduce compatibility issues or additional setup on non-KDE desktops and non-Linux platforms without full KDE integration. Kate's impact extends to its role as a default editor in numerous Linux ISO distributions featuring KDE Plasma, such as openSUSE and Manjaro KDE editions, promoting its use in system administration and development workflows. In educational contexts, it is recommended for programming courses due to its accessible interface, syntax support for instructional languages, and tools like sessions for managing multiple exercises, as seen in tutorials for text-based scripting and documentation.

References

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