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Keyword density is the percentage of times a keyword appears in your content compared to the total word count. The ideal keyword density is generally 1–2% for the primary keyword. Going above 3–4% can be seen as keyword stuffing by search engines, which may result in ranking penalties.

A well-crafted meta title should be 30–60 characters long (up to ~600px wide in Google's SERPs). Place your primary keyword near the beginning, include your brand name at the end, and write for humans first — click-worthy titles get more traffic.

Google displays titles up to ~600 pixels (?60 characters) and meta descriptions up to ~960 pixels (?155 characters). Content beyond these limits is replaced with an ellipsis. Writing within these bounds prevents truncation and improves click-through rates.

Proper heading hierarchy (H1 ? H2 ? H3…) helps search engines understand your content structure. Every page should have exactly one H1 tag containing the primary keyword. Use H2 tags for main sections and H3–H6 for subsections.

Content length isn't the only ranking factor, but longer, in-depth articles tend to rank better. Aim for 600+ words for blog posts, 1,000–2,000 words for competitive topics, and 2,000+ words for pillar pages and comprehensive guides.

A good URL slug is short, descriptive, and lowercase. Use hyphens to separate words (Google treats them as word separators), avoid stop words for shorter slugs, and always include your primary keyword. Keep slugs under 75 characters for best results.

The Flesch Reading Ease formula rates text on a 0–100 scale. Scores of 60–70 are considered standard (8th–9th grade) and appropriate for most web content. For general audiences aim for 70+. Shorter sentences and simpler words always improve readability.

A robots.txt file tells search engine crawlers which pages they can or cannot access. It should be placed at the root of your domain (e.g., https://yoursite.com/robots.txt). Note: robots.txt is a suggestion, not a security measure — use password protection for truly private content.

Open Graph (OG) tags are meta tags that control how your content appears when shared on social media platforms like Facebook, LinkedIn, and Twitter/X. Essential tags include og:title, og:description, og:image, and og:url.

301 (Permanent) — transfers most link equity (PageRank) to the destination. Use when a page has permanently moved. 302 (Temporary) — the original URL retains its equity. Use for short-term changes. Avoid redirect chains longer than 3 hops as they slow crawling and dilute link equity.

Key headers to check: X-Robots-Tag (crawling directives), Content-Type (encoding), Cache-Control (caching rules), Strict-Transport-Security (HTTPS enforcement), and Location (redirect destination). Security headers also affect user trust signals.

Combine multiple PDFs into one document.

Extract pages or split a PDF into separate files.

Reduce file size while keeping the best quality.

Convert PDF pages to JPG, PNG or WebP images.