There are several ways for students to earn money online without investment, including:

Freelancing: Students can offer their skills and services, such as writing, graphic design, or programming, on freelancing platforms like Upwork or Freelancer.

Online tutoring: Students can earn money by teaching others a subject they are knowledgeable in, either through a tutoring platform or by creating their own online course.

Online surveys: Many companies are willing to pay for consumer opinions, and students can participate in online surveys to earn money.

Selling products online: Students can use platforms like Etsy or Amazon to sell products they create or resell.

Affiliate marketing: By promoting other people's products and earning a commission on the sales they generate, students can earn money online without investment.

Social Media: If you have a good number of followers on social media platforms like Instagram, TikTok, and YouTube, then you can earn money by promoting products or services via these platforms.

Online Transcription: There are many websites and apps that pay for transcribing audio files and you can use this as an opportunity to earn money.

It's worth noting that earning money online typically requires time and effort, and may not be a quick or easy process.