edX provides bioinformatics courses in collaboration with renowned universities and institutions. The courses cover various aspects of bioinformatics, such as sequence alignment, gene expression analysis, and functional annotation. Upon completing the course requirements, you can earn a certificate.

Coursera is a good option:

https://www.coursera.org/courses?query=bioinformatics

There are several online courses in bioinformatics that offer a certificate upon completion. Here are a few reputable platforms where you can find such courses:

1. Coursera (www.coursera.org): Coursera offers a wide range of bioinformatics courses from universities and institutions worldwide. Some popular courses include "Bioinformatics Specialization" by the University of California, San Diego, and "Genomic Data Science Specialization" by Johns Hopkins University. These courses provide certificates upon completion.

2. edX (www.edx.org): edX offers bioinformatics courses from renowned universities such as MIT, Harvard, and the University of Toronto. Courses like "Introduction to Bioinformatics" by UC San Diego and "Data Analysis for Life Sciences" by Harvard University provide certificates upon successful completion.

3. Udemy (www.udemy.com): Udemy has various bioinformatics courses taught by instructors from different backgrounds. While the quality may vary, you can find courses like "Bioinformatics: Introduction & Methods" and "Bioinformatics with Python" that provide completion certificates.

4. Bioinformatics.org (www.bioinformatics.org): Bioinformatics.org offers online courses and tutorials in bioinformatics. Though they may not provide certificates, their courses cover a wide range of bioinformatics topics and can be a valuable learning resource.

5. Rosalind (www.rosalind.org): Rosalind is an online platform that focuses on bioinformatics through problem-solving. While they don't offer certificates, their interactive exercises and challenges can enhance your bioinformatics skills.

Remember to review the course syllabus, duration, and prerequisites before enrolling to ensure it aligns with your needs and skill level. Additionally, consider checking if the certificate offered by the course is recognized or accredited by relevant institutions or organizations.