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Developer guides
Guides for formats, code, validation, and developer utilities.
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27 guides
How to convert html to markdown
Convert pasted HTML to Markdown locally without running scripts.
How to convert markdown to html
Convert Markdown to sanitized HTML and allow copying/downloading the result.
How to convert unix timestamp
Convert Unix timestamps to readable dates and dates back to timestamps using explicit timezone handling.
How to decode html entity
Decode HTML entities safely as text.
How to decode jwt
Decode JWT header and payload locally without claiming to verify signatures unless actual verification is performed.
How to decode url
Decode percent-encoded URL text and report invalid sequences safely.
How to encode base64
Encode text into Base64 with UTF-8 support.
How to encode html entity
Encode characters as HTML entities locally.
How to encode url
Percent-encode text or URL components with clear mode selection.
How to format css
Format CSS locally for readability.
How to format html
Format pasted HTML locally with safe text output rather than executing untrusted markup.
How to format javascript
Format JavaScript source locally without executing the supplied code.
How to format json
Parse, validate, pretty-print, minify, copy, and download JSON locally.
How to format sql
Format common SQL syntax locally with dialect selection where supported.
How to format xml
Format XML locally while reporting malformed input.
How to generate hash
Generate common cryptographic hashes using the Web Crypto API where supported.
How to generate uuid
Generate standards-compliant random UUIDs locally using browser cryptography.
How to use cron expression helper
Explain and build common cron expressions locally with clear syntax assumptions.
How to use css minifier
Minify CSS locally without altering intended output.
How to use html minifier
Minify HTML using a browser-compatible local implementation.
How to use javascript minifier
Minify JavaScript source locally without executing user-supplied code.
How to use json minifier
Parse and minify valid JSON locally.
How to use markdown previewer
Preview Markdown locally with sanitized HTML output.
How to use regex tester
Test regular expressions against sample text with flags, matches, groups, and safe error handling.
How to validate json
Validate JSON and show useful parsing errors without sending data anywhere.
How to validate xml
Check XML well-formedness and report parser errors.
How to decode base64
Decode Base64 into readable text with validation.
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