Chemistry

JChemPaint is a chemical 2D structure editor

JChemPaint (or JCP for short) is the editor and viewer for 2D chemical structures developed using the Chemistry Development Kit (CDK).

It is implemented in several forms: a Java application and two varieties of Java applet.

This is free and open source software.

Key Features

  • Drawing and deletion of single, double, triple and stereo bonds.
  • Ring templates (3-8 atoms) with one-click attachment.
  • An extensive template library.
  • Colouring of atom types, and other rendering settings.
  • Editing of atomic charges, isotopes and hydrogen count.
  • Loading and saving of structures in Chemical Markup Language (CML) and as MDL MOL files and SDF files (loading only).
  • Automated Structure Layout, also known as Structure Diagram Generation.
  • Loading structures from the Internet using CAS or NSC number.
  • Normalization of structures, currently limited to aromaticity detection.Saving bitmap pictures of the structures.
  • Saving structures as graphics (PNG, BMP, Scalable Vector Graphics (SVG)).
  • Postscript printing.

Website: jchempaint.github.io
Support: GitHub Code Repository
Developer: The contributors to the JChemPaint project
License: GNU Lesser General Public License

JChemPaint in action

JChemPaint is written in Java. Learn Java with our recommended free books and free tutorials.


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MolsketchDraw molecular structures and export publication-ready graphics
ButlerovCreate structural formulas and chemical reaction diagrams
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Read our verdict in the software roundup.


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