How to find spam backlink?

[pablito]

3. Check if the website is penalized before by Google.

How can I check that?

[suchiroy]

You can check spam backlinks on webmaster tool or another paid tool like SEOMoz, aherfs, Woorank.
Check for the links that are irrelevant or does not belong to your website. If you are found, any junk and spam link then remove them by using disavow tool.

[Parkerspongebob]

I don't think so there is any direct method to get information about spam backlinks. You have to find those links manually. You can check the PA (Page Authority), DA (Domain Authority), PR (Page Rank) of website from where you are getting backlink. All these must be high at least PA, DA is  >25 and PR >2-3.

[pablito]

Thanks You for answer. Many seo company have wired methods, creating low webs, using domains with authority under 15, but google treats those like spamm sites. So to sum up, it have no result in seo.

Google web tools shows those spammy links after few weeks. And few times, I had to deal with it manually.

[BrettUK]

There are a wide range of tools out there like A Hrefs, Majestic SEO, SEO Spyglass.
Webmaster tools will inform you if any malicious links, or a large amount of links have been found recently.

[boysingh]

You can check and analyze your spam backlinks using Google disavow tool. This tool will help you find out the backlinks of your website which are causing harm to your website ranking in search engines.

Do you know what you are talking about? Hmm, Google Disavow tool doesn't give you any data of spam backlinks for you to analyze, disavow tool only helps you to deindex your list of bad backlinks, so it still you who must find these bad links.

[shanewatson11]

You can check the spam backlink through disavow tool. With the help of this tool you will easily remove the spam or unnatural links. This is one of the best seo tool to clean the spam issues.

[morganlong]

You can use any of the below tools to identify backlinks.
Open Site Explorer
Ahrefs
MajesticSEO
Google Webmaster Tools
Bing Webmaster Tools

Then you can analyze and remove irrelevant links. You should remove spam backlinks otherwise Goole Penalty can apply.

[halley_pham]

The main difference between good and bad backlinks is the quality of the website they are on. Depend on these signs you can see whether a backlink is good or bad:
- Links from a website that is just set up for SEO links
- Links from the comments of other websites
- Links with over optimized anchor texts
- Links within lousy, duplicate texts
- Links from China, while your local audience is in the US 

[Roy Milson]

Some ideas to detect spam link which would be harmful for your site.

1. Low PR (Page Rank)
2. Low DA and PA (Domain Authority and Page Authority)
3. Irrelevant Link
3. A website is lack of content
4. A website is bunch all types of links and lack of content
5. a site is already penalized.

Hope, It helps.