ZentoMedia is an independent studio building mobile apps, websites, and web tools that aim to be simple, useful, and easy to use.
Building Android and iOS apps that are smooth, reliable, and easy to use.
Creating websites and web applications that are fast, clear, and practical.
Turning ideas into digital products with a practical, user-focused approach.
Products built and maintained by ZentoMedia.
Train your brain with colorful math games: Learn Table, Option Quiz, Input Quiz, True/False, Find Missing, and Duel mode.
Decode, transform, inspect, and generate data directly in your browser. No signup, no install, and no need to leave the page.
Inspect BER and DER structures directly in the browser with format detection, a readable tree view, and zero server round-trips.
Encode or decode URLs, query strings, and parameter values directly in the browser.
Convert UTF-8 text to and from Base64 locally in the browser without losing Unicode characters.
Escape or unescape HTML entities such as <, >, &, quotes, and apostrophes without leaving the page.
Parse JSON into an expandable tree, unwrap JSON string layers, and decode nested fields locally in the browser.
Generate batches of UUID v4 values in the browser with flexible formatting, Base64 variants, and copy-ready output.
Generate 2FA codes locally in your browser, import otpauth QR images, and keep shared secrets off third-party services.
View a Gregorian month alongside the Vietnamese lunar calendar, convert dates both ways, and inspect Can Chi details directly in the browser.
Look up a word or phrase, then open Oxford, Cambridge, YouGlish, and Google Translate quickly from one place.
Founder • Solo Developer
ZentoMedia is a small independent studio that I build and run myself, with real joy in learning, making, and shipping useful products.
I focus on building mobile apps, websites, and small web tools that are simple, useful, and pleasant to use.