FREE & OPEN SEO TOOLS
SEOPTERA
30 free tools for SEO, development, and content creation. No signup. No tracking. Runs in your browser.
NEW — AI CRAWLER DIRECTORY
Every AI Bot Crawling Your Site in 2026
Complete database of AI crawlers from OpenAI, Anthropic, Google, Apple, Meta, and more. Know what each bot does and how to control it.
ALL TOOLS
WORD COUNTER
Count words, characters, sentences, and paragraphs.
JSON FORMATTER
Format, validate, and beautify JSON data.
UTM BUILDER
Create UTM campaign URLs for Google Analytics.
HEX → RGB
Convert colors between HEX, RGB, and HSL.
CSV → JSON
Convert CSV data to JSON format instantly.
DIFF CHECKER
Compare two texts and find differences.
CSS / JS MINIFIER
Minify CSS and JavaScript code.
ROBOTS.TXT
Create robots.txt files for your website.
OG TAGS
Generate Open Graph tags for social media.
SLUG GENERATOR
Convert text to SEO-friendly URL slugs.
HASH GENERATOR
Generate MD5, SHA-1, and SHA-256 hashes.
PASSWORD GENERATOR
Generate strong random passwords.
UUID GENERATOR
Generate UUID v4 identifiers in bulk.
TIMESTAMP
Convert Unix timestamps to dates.
BASE64
Encode and decode Base64 strings.
LOREM IPSUM
Generate placeholder text.
REGEX TESTER
Test regex with live highlighting.
MARKDOWN
Write Markdown with live preview.
KEYWORD DENSITY
Analyze keyword frequency.
SERP PREVIEW
Preview Google search appearance.
SCHEMA MARKUP
Generate JSON-LD structured data.
SITEMAP XML
Create XML sitemaps.
JSON → CSV
Convert JSON to CSV format.
TEXT CASE
Convert between text cases.
IMAGE → BASE64
Convert images to Base64.
QR CODE
Generate QR codes.
CSS GRADIENT
Create CSS gradient backgrounds.
BOX SHADOW
Generate CSS box-shadow.
URL ENCODER
Encode and decode URLs.
HTML ENCODER
Encode and decode HTML entities.