normally we read everywhere that the back links from an irrelevant website harm your seo ranking . But if i am an website designing company and i am giving a link as reference in every website that i design then what. How it effect my website's seo ranking.

I think it is bad idea
You do not do these tricks

Irrelevant backlinks can be proven harmful for your domain even Google can also penalize your website. It would be false to say that backlinks don't influence search engine rankings. The fact that backlinks influence ranking is the main reason why Google has been enforcing their guidelines and smashing link networks.

You have to understand no link is harmful by itself. Only if most of your links are with the same anchors or very low quality you can be hurt .

Backlinks on the footer of a website which you designed is not good for SEO purpose.

Yes, it give negative effects on your seo work if there are irrelevant contents and website.

Quote from: blackmagicislam on May 13, 2018, 11:57:13 PM
normally we read everywhere that the back links from an irrelevant website harm your seo ranking . But if i am an website designing company and i am giving a link as reference in every website that i design then what. How it effect my website's seo ranking.

I think you should not use this techniques,it will be bad ...

Backlinks from irrelevant websites are harmful for your domain and can penalize it in search engines.

Quote from: blackmagicislam on May 13, 2018, 11:57:13 PM
normally we read everywhere that the back links from an irrelevant website harm your seo ranking . But if i am an website designing company and i am giving a link as reference in every website that i design then what. How it effect my website's seo ranking.

Please dont use this techniques it will affect your website.this wont be able to rank in SERP

Quote from: blackmagicislam on May 13, 2018, 11:57:13 PM
normally we read everywhere that the back links from an irrelevant website harm your seo ranking . But if i am an website designing company and i am giving a link as reference in every website that i design then what. How it effect my website's seo ranking.

Don't use that technique.. If you use that, it give negative impact on your site and it's totally affect your SERP.

Back links from relevant sites with good DA helps in improving your website ranking as vice versa back links from low quality sites decreases your website rankings.