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KompoZer is a wysiwyg HTML editor using the Mozilla Composer codebase. As Nvu's development has been stopped in 2005, KompoZer fixes many bugs and adds a few useful features.

Project Samples

Main view Source view Main normal view CSS editor, box properties CSS editor, general view

Project Activity

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Categories

Text Editors, Web Design, Code Editors

License

GNU General Public License version 2.0 (GPLv2), GNU Library or Lesser General Public License version 2.0 (LGPLv2), Mozilla Public License 1.1 (MPL 1.1)

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KompoZer Web Site

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User Ratings

4.4 out of 5 stars
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ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 3 / 5
design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 3 / 5
support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 3 / 5

User Reviews

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  • stanedge Posted 2026-05-02
    I've been using Kompozer and it's predecessors for 25+ years mainly for photography type websites for what I want its perfect. Once I have created a couple of pages I can quickly use 'save as' to create the others I'll need. I tried all the other WYSIWYG ones but never found anything so easy ad fast. I use Stu Nicholls iStu12 slideshow and Malsup auto one Cycle 2 and a 'no right click' code. All work very well indeed and no problems at all with Windows 11.
  • srgrass Posted 2020-10-18
    Thank you very much for the free open source program!
  • lalm Posted 2020-10-16
    Unfortunately it does no longer work with the new MAcOS Catalina. It is a pitty because I really liked using Kompozer - it was very easy to use and was enough for what I needed. If you can update it to make it compatible with the new MacOS it would be great! Thank you in advance.
  • skachat Posted 2020-06-13
    I have used in past Kompozer and i really like it for it's simplicity, sometimes you need simple and effective html editor, I hope Mozilla won't abond this project, it have bugs since major update, Mozilla should invest more in this project, this software is great. Skachat.online , one of the examples of my projects when developer doing it's stuff over professional expensive software and I need just to put something fast and easy way for free, Kompozer always comes on hand.
  • edward27821 Posted 2018-12-05
    This one is garbage. Will not open console tree. Will open, edit and publish if I type in full path of each file No replies on bug reports.
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Additional Project Details

Intended Audience

End Users/Desktop

Registered

2006-06-13

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