Click to upload or drag and drop an image
Supports JPG, PNG, GIF or paste with Ctrl+V
Quickly search compounds by CAS number, molecular formula, or English name to automatically generate chemical structures. Powered by ChemTradeHub's extensive compound database, instantly load structures into the drawing editor.
FreeChemDraw Chemical Structure Knowledge Base provides clear and practical information about chemical structure notations and molecular representation formats.
Looking for free chemical structure software? FreeChemDraw is an online tool that allows you to draw chemical structures and reactions for free, with no installation required.
An overview of the latest chemical OCR tools for recognizing chemical structures, molecular formulas, and diagrams from images. Learn about OSRA, MolScribe, ChemPix, and ChemScanner for optical chemical recognition and structure reconstruction.
Learn what chemical structure formulas are, their types, and how to draw them easily. With FreeChemDraw, you can create and export molecular structures, visualize bonds, and build 3D models for research and education.
A complete guide to chemical reaction drawers: drawing reagents, arrows, and reaction conditions; handling stereochemistry, isotopes, and atom mapping; importing/exporting SMILES/MOL; and recognizing chemical reactions from images using OSRA. Perfect for research, patents, and education.
Comprehensive analysis of mainstream chemical structure editors in 2025, including ChemDraw, ChemDoodle, MarvinSketch, Ketcher, and FreeChemDraw. In-depth comparison of features, pricing, and use cases to help researchers, students, and developers choose the best chemical drawing software.
FreeChemDraw is a free online tool for drawing and recognizing chemical structures. Built on the open-source Ketcher editor and OSRA OCR, it supports molecule drawing, image structure recognition, and can generate structures from CAS numbers or IUPAC names, helping researchers manage chemical data efficiently.
Here are some frequently asked questions about FreeChemDraw, covering structure recognition, file export, reaction editing, and more.
1. Structure Drawing and Editing
All structure drawing, editing, PNG/SVG export, SMILES copying, and MOL file download functions are processed entirely within your browser. No data is uploaded to or stored on the server, and no network communication occurs during this process.
2. Compound Search
When using the compound search feature, entered CAS numbers or compound names are sent to our partner site (https://www.chemtradehub.com/) for structure matching. This information is not stored on our server. Only necessary network access logs are recorded.
3. Image Recognition
Uploaded or pasted images are temporarily transmitted to the server for structure recognition processing. Regardless of the recognition result, the image data is deleted immediately after processing and is not permanently stored. Only basic access logs related to network communication are retained.
Yes. Simply paste the SMILES text or MOL file content into the editor, and the chemical structure will appear automatically.
You can upload a local image or paste it directly into the image area at the top-right corner. Click “Recognize” and the system will automatically convert it into an editable structure.
You can export MOL files, SMILES text, and high-quality PNG or SVG images — ideal for papers, reports, and presentations.
Yes. FreeChemDraw supports reaction arrows, multi-molecule reactions, labeling of reactants and products, and RNX file import/export.
Yes. Our recognition model is trained on extensive chemical data and achieves over 98% accuracy for common organic structures.
No. FreeChemDraw is a completely free online tool — just open the website and start using it instantly.
FreeChemDraw provides researchers, students, and chemists with a complete set of online tools for drawing, recognizing, and editing chemical structures — supporting multiple import and export formats for easy chemical communication.
Draw chemical structures directly in your browser with support for atoms, bonds, rings, and functional groups.
Upload or paste structure images to automatically recognize and convert them into editable MOL or SMILES files.
Easily draw chemical reactions with reaction arrows, multiple reactants, and RNX file import support.
Export your chemical structures as MOL, SMILES, PNG, or SVG formats for sharing or publication.
Designed for simplicity, efficiency, and precision — FreeChemDraw delivers a reliable chemical structure solution for both research and education.
