Are SEO and developer tools free?

Yes, all SEO and developer tools are completely free with no usage limits and no signup required.

How accurate is the domain authority checker?

The DA checker uses multiple data sources to provide reliable authority scores. Results are consistent with major SEO platforms.

Can I use the formatters for large files?

Yes, the formatters handle large files efficiently. However, very large files (10MB+) may take longer depending on your device.

What code conversions are supported?

Supported conversions include JSON ↔ YAML, JSON ↔ CSV, XML ↔ JSON, TypeScript → JavaScript, SCSS → CSS, and more.

Is my code stored when I use the formatters?

No, all code processing happens locally in your browser. Your code is never sent to any server or stored anywhere.

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Free SEO & Developer Tools

8+ essential SEO and developer tools — speed test, IP lookup, DA checker, plagiarism checker, code formatters, and code converter. 100% free.

8+ Free Tools

All Free SEO & Developer Tools Tools

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Speed Test

Test your website loading speed and performance for free online. Get detailed insights, Core Web Vitals scores, and optimization tips — no signup or installation required. Works instantly in your browser. Perfect for web developers, SEO professionals, and site owners improving page speed.

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Ip Lookup

Find IP address location, ISP, and detailed geolocation data for free online. Check your own IP or look up any address — no signup or installation required. Works instantly in your browser. Perfect for network troubleshooting, verifying VPN connections, and investigating suspicious activity.

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Da Checker

Check domain authority and page authority scores for free online. Analyze website SEO strength and link profile — no signup or installation required. Works instantly in your browser. Perfect for SEO professionals, marketers, and competitors analyzing backlink profiles and ranking potential.

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Plagiarism Check

Check text for plagiarism and duplicate content for free online. Verify originality against billions of web pages — no signup or installation required. Works instantly in your browser. Perfect for students, writers, and educators ensuring content authenticity and avoiding copyright issues.

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Json Formatter

Format, beautify, and validate JSON data for free online. Syntax highlighting, error detection, and tree view — no signup or installation required. Works instantly in your browser. Perfect for developers debugging APIs, cleaning up configuration files, and inspecting JSON responses.

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Css Formatter

Format and beautify CSS code for free online. Clean up messy stylesheets with proper indentation and spacing — no signup or installation required. Works instantly in your browser. Perfect for developers maintaining legacy CSS, cleaning minified stylesheets, and improving code readability.

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Html Formatter

Format and beautify HTML code for free online. Clean up messy markup with proper indentation and structure — no signup or installation required. Works instantly in your browser. Perfect for developers fixing minified HTML, improving code readability, and maintaining clean web templates.

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Code Converter

Convert code between programming languages and formats for free online. Transform data structures like JSON to YAML, CSV to JSON, and more — no signup or installation required. Works instantly in your browser. Perfect for developers migrating data formats and converting configuration files.

Why Choose ToolSwift for SEO & Developer Tools

SEO Insights

Check domain authority, test site speed, and verify content originality — all essential for search optimization.

Code Formatting

Instantly beautify or minify JSON, CSS, and HTML code with syntax validation.

Code Conversion

Convert between data formats and code structures — JSON to YAML, CSV to JSON, TypeScript to JavaScript, and more.

No Installation

All tools run in your browser. No downloads, no extensions, no IDE plugins needed.