There are a few practical ways to check this before you commit.
Start by asking directly about their link-building approach. Ethical SEO relies on earning links through genuine outreach, quality content, and real partnerships — not buying links in bulk or using private link networks. If an agency is vague or dodges specifics when you ask how they build backlinks, that's a red flag worth taking seriously.
Look at their past client rankings over time too, not just current position. Sites that rank through manipulative tactics — like keyword stuffing, cloaking, or hidden text — often see sharp drops after Google algorithm updates. A trustworthy SEO company in Noida should be able to show steady, gradual ranking growth across multiple past clients rather than sudden spikes followed by crashes.
Be wary of guarantees as well. No legitimate agency can promise a specific ranking position or a fixed timeline, since Google's algorithm isn't something anyone fully controls. Confident, specific guarantees usually signal risky shortcuts rather than genuine expertise.
Ask what tools and reporting they use, and request visibility into actual work done each month — content published, technical fixes made, links earned. Ethical agencies are generally happy to show this in detail, since there's nothing to hide.
Finally, check whether they explain their strategy in plain terms you can actually understand. Agencies relying on shady tactics often prefer keeping clients in the dark with jargon, while ethical ones tend to welcome questions about their process.