Ahrefs costs $99/month. Semrush costs $140/month. But you can build quality backlinks with $0 in tools if you know where to look. Here are 10 free tools that cover every stage of link building: prospecting, analysis, outreach, and monitoring.
Prospecting Tools
Finding sites that might link to you is the first step. These tools help you discover opportunities.
1. Google Search Operators
The most powerful prospecting tool is Google itself. Use advanced search operators to find link opportunities at scale:
- Guest posts:
"your niche" + "write for us"or"your niche" + "contribute" - Resource pages:
"your topic" + "useful resources"or"your topic" + inurl:resources - Competitor mentions:
"competitor name" -site:competitor.com(finds sites that mention them — they might mention you too) - Broken link targets:
"your topic" + inurl:linksto find link pages, then check for broken ones
2. Google Search Console
Your own backlink data, straight from Google. Go to Links → External links to see who links to you, which pages get the most links, and what anchor text they use. This data is authoritative (it's what Google actually sees) and completely free.
Use it for: Understanding your current backlink profile, finding your most linkable content (create more like it), and discovering sites that already link to you (ask them for additional links to new content).
3. Ahrefs Free Backlink Checker
Ahrefs offers a free tool that shows the top 100 backlinks for any URL or domain. Enter a competitor's URL to see who links to them — those are your prospecting targets. You also get Domain Rating (DR) and the number of referring domains.
Limits: Only top 100 results (paid shows all). No filtering, sorting, or export. But for quick competitor analysis, it's enough to build a solid prospect list.
4. Ubersuggest (Free Tier)
Neil Patel's tool includes backlink analysis in its free tier. Enter any domain to see referring domains, backlink count, and domain authority. The "Backlinks" tab shows individual links with anchor text, DA, and follow/nofollow status. Three searches per day is limiting but enough for targeted research.
Outreach Tools
Once you've found prospects, you need to contact them. These tools help you find emails and manage outreach.
5. Hunter.io
Enter any domain, get the email addresses associated with it. Hunter finds email patterns (firstname@, first.last@) and verifies them. The free tier gives you 25 searches and 50 verifications per month — enough for targeted outreach if you're strategic about which prospects to research.
Pro tip: Use the Chrome extension to find emails while browsing prospect sites. Combine with Google Sheets to track your outreach pipeline.
6. Google Sheets + Mail Merge
Your free outreach CRM. Track prospects in a spreadsheet (URL, contact name, email, status, follow-up date), then use a mail merge add-on (like Yet Another Mail Merge — free for 50 emails/day) to send personalized outreach at scale. Not as polished as paid outreach tools, but functionally equivalent for small campaigns.
Cold Email Playbook
The tools find the contacts. These templates get the replies. 5 proven outreach templates with follow-up sequences and subject line formulas.
Get the Playbook — $9Analysis & Monitoring Tools
Track your progress and analyze link quality with these free options.
7. Check My Links (Chrome Extension)
Scans any webpage and highlights all links as green (working) or red (broken). Essential for broken link building: find resource pages in your niche, run Check My Links, identify broken links, then email the site owner offering your content as a replacement. One of the highest-converting link building tactics, and this tool makes the prospecting step effortless.
8. Wayback Machine
When you find a broken link, the Wayback Machine shows you what the dead page used to contain. This lets you create a better replacement and tell the site owner: "Your link to [dead URL] is broken. That page used to cover [topic]. I've written an updated version at [your URL]." Showing you understand what was there makes your pitch 3x more credible.
9. MozBar (Chrome Extension)
Shows Domain Authority (DA) and Page Authority (PA) for any page you visit. Use it while prospecting to quickly assess whether a site is worth pursuing. A DA 40+ site in your niche is worth an outreach email. A DA 10 site with no traffic probably isn't. MozBar lets you make this judgment instantly without switching to another tool.
10. Google Alerts
Set up alerts for your brand name, competitor names, and key topics. When someone mentions your brand without linking, email them and ask for the link (unlinked mention outreach). When competitors get covered, pitch the same publications. When new content appears on your topics, check if they'd benefit from linking to your resource.
Set up these 4 alerts: your brand name, your competitor's name, "your topic" + "resources", and your name/author name.
The Free Link Building Workflow
Here's how to combine these tools into a repeatable weekly process:
- Monday — Prospect (30 min): Use Google Search operators to find 10 new link opportunities. Check authority with MozBar. Add qualified prospects to your Google Sheet.
- Tuesday — Research (20 min): For each prospect, find contact info with Hunter.io. Review their content to personalize your pitch.
- Wednesday — Outreach (30 min): Send personalized emails to 5–10 prospects using your mail merge setup. Use the Cold Email Playbook templates adapted for link building.
- Thursday — Broken links (20 min): Find 3 resource pages with Check My Links. Research dead content on Wayback Machine. Pitch replacements.
- Friday — Follow up (15 min): Follow up with prospects who haven't replied (wait 5–7 days). Check Google Alerts for new mentions. Update your Google Sheet with results.
Frequently Asked Questions
Yes. Google Search Console, Google operators, Ahrefs Free, Hunter.io free tier, and Chrome extensions cover every link building task. Paid tools save time at scale, but free tools work for 5–20 links per month.
Depends on competition. Low-competition keywords: 0–5 quality links. Medium: 10–30 referring domains. High: 50–200+. Quality matters more than quantity — one DR 70 link beats 50 directory links.
Start with: (1) Resource page outreach — find curated link pages and suggest your content. (2) Guest posting — write for blogs in your niche. (3) Broken link building — find dead links and offer replacements. All work with free tools.
2–6 months for ranking improvements. Google needs to crawl, evaluate, and recalculate. Build 5–10 links per month consistently and measure progress quarterly, not weekly.
Turn Outreach Into Backlinks
The right email gets the link. The wrong one gets ignored.
- 5 outreach email templates (guest post, resource page, broken link, HARO, mention)
- Follow-up sequences (3, 5, and 7-touch)
- Subject line formulas with open rate data
- Personalization framework for each template