Domain factors
| Domain registration length | Keyword Appears in Top Level Domain | Domain Age |
| Exact Match Domain | Domain History | Keyword in Subdomain |
| Country TLD extension | Penalized WhoIs Owner | Public vs. Private WhoIs |
page-level factors
| Keyword in Title Tag | Keyword Appears in H1 Tag | Keyword in Description Tag |
| TF-IDF | Page Loading Speed via HTML | Page Covers Topic In-Depth |
| LSI Keywords in Title and Description Tags | Latent Semantic Indexing Keywords in Content (LSI) | Rel=Canonical |
| Duplicate Content | Google Hummingbird | Entity Match |
| Use of AMP | Keyword Prominence | Historical Page Updates |
| The magnitude of Content Updates | Content Recency | Image Optimization |
| Syndicated Content | Grammar and Spelling | Outbound Link Theme |
| Outbound Link Quality | Keywords in H2, H3 Tags | Content Hidden Behind Tabs |
| Helpful “Supplementary Content” | “Hidden” Content on Mobile | Mobile Usability |
| Mobile-Friendly Update | Broken Links | Quality of Internal Links Pointing to Page |
| Number of Internal Links Pointing to Page | Multimedia | Number of Outbound Links |
| Page’s PageRank | Domain Authority | HTML errors/W3C validation |
| Affiliate Links | Reading Level | Keyword in URL |
| Page Category | Human Editors | URL Path |
| URL Path | Too Many Outbound Links | Priority of Page in Sitemap |
| Bullets and Numbered Lists | References and Sources | URL String |
| Useful Content | Parked Domains | User-Friendly Layout |
| Page Age | UX Signals From Other Keywords Page Ranks For | |
Site-level factors
| Domain Trust/TrustRank | Contact Us Page | Content Provides Value and Unique Insights |
| SSL Certificate | Server Location | Site Uptime |
| Presence of Sitemap | Site Updates | Site Architecture |
| Breadcrumb Navigation | Duplicate Meta Information On-Site | E-A-T |
| YouTube | Mobile-Optimized | Core Web Vitals |
| User reviews/Site reputation | Use of Google Analytics and Google Search Console | Site Usability |
Backlink factors
| # of Linking Root Domains | Linking Domain Age | Backlink Anchor Text |
| # of Linking Pages | # of Links from Separate C-Class IPs | Authority of Linking Page |
| Links from .edu or .gov Domains | Alt Tag (for Image Links) | Nofollow Links |
| Homepage Authority | Links From Ads | Guest Posts |
| Links from Bad Neighborhoods | Links from “Expected” Websites | Links From Competitors |
| Authority of Linking Domain | Contextual Links | “Sponsored” or “UGC” Tags |
| Diversity of Link Types | Link Location In Content | Country TLD of Referring Domain |
| Link Title Attribution | Internal Link Anchor Text | Excessive 301 Redirects to Page |
| Positive Link Velocity | Keyword in Title | Page-Level Relevancy |
| Linking Domain Relevancy | Link Location on Page | Co-Occurrences |
| Linked to as Wikipedia Source | Link from Authority Sites | Links from “Hub” Pages |
| Negative Link Velocity | Schema.org Usage | Links from 301 |
| Number of Outbound Links on Page | TrustRank of Linking Site | Word Count of Linking Content |
| User-Generated Content Links | Reciprocal Links | Natural Link Profile |
| Links from Real Sites vs. “Splogs” | Backlink Age | Sitewide Links |
| Quality of Linking Content | Forum Links |
User interaction
| Organic Click Through Rate for a Keyword | Rank Brain | Bounce Rate |
| Organic CTR for All Keywords | Pogo sticking | Repeat Traffic |
| Blocked Sites | Dwell Time | Chrome Bookmarks |
| Direct Traffic | Number of Comments |
Special google algorithm rules
| User Search History | User Browsing History | Query Deserves Diversity |
| Query Deserves Freshness | Transactional Searches | Domain Diversity |
| DMCA Complaints | “YMYL” Keywords | Safe Search |
| Geo-Targeting | Featured Snippets | Local Searches |
| Top Stories box | Payday Loans Update | Single Site Results for Brands |
| Easter Egg Results | Image Results | Shopping Results |
Brand signals
| Brand + Keyword Searches | Branded Searches | Brand Name Anchor Text |
| Known Authorship | Official Linkedin Company Page | The site has Twitter Profile with Followers |
| Site Has Facebook Page and Likes | Brand Mentions on Top Stories | The legitimacy of Social Media Accounts |
| Unlinked Brand Mentions | Brick and Mortar Location |
On-site webspam factors
| Redirects | Links to Bad Neighborhoods | Panda Penalty |
| Interstitial Popups | Popups or “Distracting Ads” | Ads Above the Fold |
| Doorway Pages | Gibberish Content | Site Over-Optimization |
| Meta Tag Spamming | IP Address Flagged as Spam | Autogenerated Content |
| Excess PageRank Sculpting | Affiliate Sites | Hiding Affiliate Links |
Off-site webspam factors
| Low-Quality Directory Links | Hacked Site | Unnatural Links Warning |
| Links From Unrelated Websites | Link Profile with High % of Low-Quality Links | Penguin Penalty |
| Unnatural Influx of Links | Manual Actions | Links From Article Directories and Press Releases |
| Unnatural Link Spike | “Poison” Anchor Text | Links from the Same Class C IP |
| Widget Links | Temporary Link Schemes | Reconsideration Request |
| Disavow Tool | Google Dance | Google Sandbox |
| Selling Links | ||
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