HTML transformation
HTML Entity Encode / Decode
Escape or unescape HTML entities such as <, >, &, quotes, and apostrophes without leaving the page.
Escape and unescape HTML entities directly
Paste markup or escaped content, then convert it locally in the browser in one step.
- 1Paste the markup or escaped text you want to transform.
- 2Use Encode to escape entities or Decode to turn them back into readable markup.
- 3Copy the result into templates, CMS content, or test data.
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ASN.1 Lens
Binary inspectionInspect BER and DER structures directly in the browser with format detection, a readable tree view, and zero server round-trips.
URL Encode / Decode
URL transformationEncode or decode URLs, query strings, and parameter values directly in the browser.
Base64 Encode / Decode
Base64 transformationConvert UTF-8 text to and from Base64 locally in the browser without losing Unicode characters.
JSON Decode Tree
JSON inspectionParse JSON into an expandable tree, unwrap JSON string layers, and decode nested fields locally in the browser.
GUID / UUID Generator
Identifier generationGenerate batches of UUID v4 values in the browser with flexible formatting, Base64 variants, and copy-ready output.
2FA / TOTP Code Generator
2FA generationGenerate 2FA codes locally in your browser, import otpauth QR images, and keep shared secrets off third-party services.
Vietnamese Lunar Calendar
Calendar referenceView a Gregorian month alongside the Vietnamese lunar calendar, convert dates both ways, and inspect Can Chi details directly in the browser.
English Pronunciation Tool
Pronunciation learningLook up a word or phrase, then open Oxford, Cambridge, YouGlish, and Google Translate quickly from one place.