Free Link Building Tools: A $0 Stack That Works

You do not need an expensive SEO suite to build links. What you need is a way to find prospects, a way to check them, a way to contact them and a way to track replies. Every one of those jobs has a free option, and most of them are tools you probably already have open.

I have built links since 2016 and run a private link-exchange community, so this is the stack I would hand a new site owner on day one. I verified each tool's free limits on its own site or a recent source. Where limits were unclear or contradictory, I describe the tool and skip the number.

The $0 link building stack at a glance

Step 1: Know what you already have

Before chasing new links, see what exists. Verify your site in Google Search Console and open the Links report. It shows top linking sites, top linked pages and anchor text, and you can export it.

Then add the same site to Ahrefs Free. Ahrefs says it is free on an unlimited number of verified websites, and its FAQ lists up to 1,000 backlinks visible at once. Two indexes are better than one, because each tool finds links the other misses. For tool-by-tool limits, see our comparison of free backlink checker tools.

Step 2: Find prospects

Look at who links to competitors

Free tiers let you pull a sample of a competitor's links. Ubersuggest lets a free account see up to 100 backlinks per site according to its help center. SEO SpyGlass free analyzes up to 1,100 per website, per the SEO PowerSuite page. Look for pages that link to two or three competitors but not to you. Those are your warmest targets.

Set alerts for brand mentions

Google Alerts emails you when new results match your query. Create one for your brand and product names, and exclude your own domain:

"Your Brand" -site:yourdomain.com

When someone mentions you without linking, a short polite email often turns the mention into a link. Third-party guides recommend this exclusion trick; Google's help page covers the alert options themselves.

Hunt broken links

The free Check My Links extension scans a page and flags links as valid, redirected or invalid with a status code. Open a resource page in your niche, find dead links, and offer your own page as the replacement.

Watch for expert-quote requests

Journalists post requests for sources, and answering is free. HARO is back under new ownership and #journorequest on X remains a working search. I cover the current status in our guide to HARO alternatives and expert quotes.

Step 3: Vet before you pitch

A link from a bad neighbor wastes your effort. Run each prospect through one free checker and ask three questions.

• Does the site have real topical focus, or does it accept any topic?
• Do its top links look editorial?
• Would you be happy if a customer saw your link on this page?

Semrush's free account gives 10 requests per day according to its own post, which is enough to vet about ten prospects a day if you spend one request each. Rotate with Ubersuggest to stretch the quota.

Step 4: Find contacts and send outreach

For contact details, check the site's own contact and author pages first. Hunter is a common free option for finding addresses, but its free allowance has changed over time. Older posts cite 25 searches a month and newer pages talk about credits, so read its current pricing page before you plan around a number.

Keep the pitch short and specific. Here is the template I use for a resource-page request:

Subject: Quick suggestion for your remote work resources page
Hi Dana, I found your list of remote work tools while researching onboarding. One link on it looks dead (the third in the "Video" section). We published a guide on async onboarding that covers the same ground, in case it helps your readers: [URL]. Either way, thanks for a useful page.

Send follow-ups after about a week. Many replies come from the second email.

Step 5: Track everything in a spreadsheet

You do not need a CRM for 50 prospects. Use one sheet with these columns:

• Domain and contact name
• Source (competitor gap, broken link, mention, community)
• Date contacted and follow-up date
• Status (replied, agreed, live, declined)
• Live URL and anchor text

After a link goes live, check it in Search Console or Ahrefs Free a few weeks later to confirm it was indexed and has not been removed.

The missing piece: people to swap with

Tools find prospects. They do not give you a reply. That is the hardest part of link building, and the numbers show why: Backlinko's study of 912 million blog posts found that 94% get zero external links. Most sites never earn links by waiting.

According to Ahrefs, 73.6% of the 140,592 domains it studied with 10K+ monthly visits have reciprocal links, so exchanges are normal. They are also something Google watches: its spam policies flag "excessive link exchanges" done purely to cross-link. Keep swaps relevant and few. Our article on link exchange without hurting SEO shows how.

One place to meet partners

Our Free Backlinks Slack community is one option. Members post what they want and offer, such as guest posts, roundup inclusions and ABC swaps, in one channel. You can join Free Backlinks if you want a ready pool of partners, or build your own list with the stack above. We explain ABC swaps in the three-way exchange guide.

 # exchange-links

A 45-minute weekly routine

Tools only help if you use them on a schedule. This is the routine I would give a solo site owner.

1. 10 minutes: open Search Console and Ahrefs Free, note new or lost links, and thank anyone who linked to you.
2. 10 minutes: skim your Google Alerts for unlinked mentions and send two or three short emails.
3. 15 minutes: pick one competitor, review a sample of their links, and add five relevant prospects to your sheet.
4. 10 minutes: send follow-ups to anyone you contacted last week and update statuses.

Done weekly, that is about three hours a month, and it adds up to dozens of qualified conversations over a quarter. The compounding comes from consistency, not from any single tool. Many beginners burn out because they try to audit everything on day one, then stop. A small routine that you keep beats a big project that you drop.

Quick example

Say you run a project management app. You find a competitor linked from a "best tools for remote teams" roundup. You check the roundup's author in a free checker, see a healthy mix of editorial links, and confirm the page is updated this year. You email the author with a one-paragraph summary of what your tool does better for small teams, and offer to share a statistic from your own data. That one email uses three free tools and costs nothing, and it is the same pattern behind most links we see placed in the community.

What free tools will not do

• Replace judgment. Authority scores are vendor estimates.
• Remove limits. Free tiers cap queries or rows, and vendors adjust them without notice.
• Make a link safe. Relevance and editorial value matter more than any score.

If you are tempted to skip all this and pay for links, read what cheap backlinks really buy you first.

Sources

• Google – Links report, Search Console Help
• Google – Create an alert, Search Help
• Ahrefs – Ahrefs Webmaster Tools (Ahrefs Free)
• Ahrefs – FAQ
• Semrush – What can you do with a free Semrush account?
• Ubersuggest Help – Free Account: Key Features and Limits
• SEO PowerSuite – SEO SpyGlass
• Hunter – Pricing update (February 2021)
• SelectorsHub – Check My Links
• Ahrefs – Reciprocal links study
• Backlinko – Content study of 912 million blog posts
• Google Search Central – Spam policies