Free Unlimited (Beta) All tools are free with no limits during beta. Limits will be introduced later; early users will get benefits.

Developer Tools

Free online tools for developers. No sign-up required.

Browse by category or tag (hubs)

Most Used Tools

Utilities 10 views Email Header Spam DKIM SPF DMARC
Email Spam Score Checker

Analyze email headers and estimate deliverability / spam risk.

Open
Developer 10 views JWT Token Decoder JSON Security
JWT Decoder

Decode JWT header and payload as readable JSON (no verification).

Open
Utilities 10 views SEO Audit Meta Performance Technical
SEO Analyzer

Premium on-page & technical SEO audit for a URL (with optional mini-crawl).

Open
Developer 10 views Text Diff Compare Developer
Text Diff Checker

Compare two texts and highlight differences instantly.

Open
Developer 10 views URL Encode Decode Querystring
URL Encode/Decode

Encode or decode URLs safely for web requests.

Open
Developer 11 views UUID Generator Security
UUID Generator

Generate UUID v4 instantly.

Open

Other tools

Developer 5 views Base64 Encode Decode Converter
Base64 Encode/Decode

Encode or decode Base64 quickly.

Open
Developer 7 views Cron Scheduler Time
Cron Expression Generator

Generate cron expressions with visual interface.

Open
Utilities 7 views SEO Duplicate Content Similarity Articles
Duplicate Content Checker

Compare multiple articles and detect similarity/duplicate content.

Open
Developer 5 views Hash MD5 SHA256 Security Generator
Hash Generator

Generate MD5 and SHA hashes instantly.

Open
Developer 5 views IP Subnet Network
IP Subnet Calculator

Calculate network address, broadcast, and host range.

Open
Developer 9 views JSON Formatter Validation
JSON Formatter

Format and validate JSON.

Open
Developer 5 views JSON XML Converter
JSON to XML Converter

Convert JSON to XML format instantly.

Open
Developer 5 views JavaScript Beautify Formatter Developer
JavaScript Beautifier

Format JavaScript with readable indentation.

Open
Developer 5 views JavaScript Minify Compression Developer
JavaScript Minifier

Safely minify JavaScript by removing comments and extra whitespace.

Open
Utilities 6 views SEO Keywords Density Content
Keyword Density Analyzer

Analyze keyword frequency and density for any text.

Open
Utilities 5 views Password Generator Security Random
Password Generator

Generate secure random passwords with custom rules.

Open
Developer 5 views Regex Tester Pattern
Regex Tester

Test regular expressions with live matching.

Open
Utilities 5 views Robots SEO Crawl Validator Generator
Robots.txt Generator

Generate and validate robots.txt rules.

Open
Utilities 7 views Schema.org JSON-LD Structured Data SEO Validator
Schema.org Generator & Validator

Generate JSON-LD structured data and validate it.

Open
Utilities 7 views Sitemap SEO XML URL Generator Index
Sitemap Generator

Generate a valid sitemap.xml from a list of URLs.

Open
Utilities 7 views Timestamp Converter Date
Timestamp Converter

Convert between Unix timestamp and date.

Open
Developer 9 views UUID Generator Bulk
UUID Bulk Generator

Generate multiple UUIDs at once (1-500).

Open

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