Pronunciation learning
English Pronunciation Tool
Look up a word or phrase, then open Oxford, Cambridge, YouGlish, and Google Translate quickly from one place.
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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.
HTML Entity Encode / Decode
HTML transformationEscape or unescape HTML entities such as <, >, &, quotes, and apostrophes without leaving the page.
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.