MolPad Chemical structure editor Open in browser →

Open a .cdx or .cdxml file without ChemDraw

Drop the file below and it opens in MolPad, a free structure editor that runs in your browser. No account is needed and the file is never uploaded.

Drop a .cdx or .cdxml file here
or choose a file. Molfile, SDF, RXN and SMILES also work.
structure O N H O N H 2 O O
Oseltamivir, saved to a binary .cdx file and reopened in MolPad.

About the formats

.cdx and .cdxml are ChemDraw's document formats. .cdx is binary and .cdxml is XML, and both store the same information: atoms, bonds, stereochemistry, labels, arrows and page layout. Because they store the structure itself and not an image, the file can be edited and converted once it is open.

Is my file uploaded?

No. The file is read by your browser on this page. The site is static files and has no server that could receive it.

Open MolPad

MolPad © 2026 Ryan Williams. All rights reserved. An independent product, not affiliated with, endorsed by or sponsored by any other software vendor. CDX and CDXML are file formats originating with ChemDraw, a trademark of its respective owner; the names appear here only to identify those formats.