PyPulseq is a free, open-source and vendor-neutral pulse sequence development (PSD) tool, allowing users to develop MR sequences using the Python programming language. This work demonstrates running PyPulseq in a web browser. This is accomplished by leveraging Google Colab which enables executing arbitrary code in a web browser. A single-slice 2D Gradient Recalled Echo pulse sequence is programmed and executed on a 3T scanner and the acquired data is visualized. PyPulseq on Colab enables portable PSD. It is beneficial for educational purposes, collaborative PSD and for fostering reproducible acquisition methods.