Free online tools for developers & SEO
Formatters, generators, and site checks — each tool has a clear name and short summary so you can find what you need quickly.
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JSON Formatter
Developer
Format, validate, and minify JSON in your browser. No data is sent to our servers.
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XML Formatter
Developer
Beautify and minify XML safely in the browser. Your XML never leaves your device.
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SQL Formatter (basic)
Developer
Basic SQL tidying: new lines after common keywords. Not a full SQL parser; good for quick cleanup.
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Open Multiple Links
Developer
Paste a list of links and open them all in new browser tabs. Useful for research and QA.
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Extract URLs from Text
Developer
Pull http(s) links out of any blob of text. Runs entirely in your browser.
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Meta & Open Graph Checker
SEO & publishing
Fetch a public page and inspect title, meta description, Open Graph, Twitter cards, and canonical link.
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DNS Lookup
DNS & security
Query public DNS records for a domain.
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Domain registration (RDAP)
DNS & security
Query RDAP registration data for a domain over HTTPS. Safer than arbitrary port scans.
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SSL Certificate Check
DNS & security
Inspect the certificate served on HTTPS port 443 for a public hostname.
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HTTP Redirect Chain Checker
SEO & publishing
Follow redirects safely and see each hop’s URL and HTTP status.
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Base64 Encode / Decode
Developer
Encode text to Base64 or decode Base64 to UTF-8 text in the browser.
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URL Encode / Decode
Developer
Percent-encode or decode strings for query parameters and paths. Client-side only.
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UUID Generator
Developer
Generate random UUID v4 identifiers instantly in the browser.
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Hash Generator (MD5, SHA…)
Developer
Compute MD5, SHA-1, SHA-256, or SHA-512 of text. Server-side with rate limits; or use SHA in browser via Web Crypto.
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Cron Expression Helper
Developer
Plain-language hints for standard 5-field cron expressions (minute hour day month weekday).
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Regex Tester
Developer
Test regular expressions against sample text. Runs locally with the JS RegExp engine.
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Text Diff
Writing & text
Line-by-line comparison of two pasted texts in the browser.
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Lorem Ipsum Generator
Writing & text
Generate placeholder paragraphs, sentences, or words for design and demos.
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Reading Time Estimator
SEO & publishing
Estimate reading time from word count (~200–250 WPM). Paste your article text.
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Title & Meta Description Length
SEO & publishing
Check pixel-width approximations and character counts for Google SERP snippets.
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UTM Campaign Link Builder
SEO & publishing
Build tracked URLs with utm_source, utm_medium, utm_campaign, and optional content/term.
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SEO Slug Generator
SEO & publishing
Turn a title into a lowercase, hyphenated URL slug. Client-side only.
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