Online Apps Lab - Free Online Tools & Browser Games
Utilities
Lightweight browser-based developer tools — from JSON formatting to Base64 encoding. Everything runs locally with no sign-up required.
JSON, JSON Lines Viewer
View and search through JSON, JSON Lines data.
JSON Formatter
Beautify, minify, and validate JSON.
Calculator
Scientific calculator with keyboard support.
Timezone Converter
Convert time between any timezones.
QR Code Generator
Generate premium QR codes instantly.
TinyURL Generator
Shorten long links instantly.
UUID Generator
Generate secure v4 UUIDs instantly.
Base64 Tool
Encode and decode strings instantly.
URL Tool
Encode and decode URLs instantly.
Timestamp Tool
Convert Epoch to Date instantly.
Text Diff Tool
Compare text files side-by-side.
Scratch Notepad, Text Editor
Simple scratchpad for quick notes.
Password Generator
Generate strong, secure passwords instantly.
Regex Tester
Test and debug regular expressions instantly.
Markdown Previewer
Write Markdown, see live HTML preview.
Color Picker
Pick colors and get HEX, RGB, HSL values.
Lorem Ipsum, Random Text Generator
Generate placeholder text for your designs.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
Word Counter
Count words, characters, and reading time.
Case Converter
Convert text to any letter case format.
Age Calculator
Calculate your exact age and fun birthday stats.
Days Calculator
Count days between dates or add/subtract days.
IP Address Lookup
Find your IP address and geolocation details.
Games
Classic arcade and card games reimagined for the browser. Jump in and play instantly — no downloads, no accounts.
Why Online Apps Lab?
No Installation Required
All our tools run directly in your browser. We use modern web technologies like HTML5 and Vanilla JS to ensure lightning-fast performance without the bloat of traditional software.
Privacy First Design
Your data stays on your machine. For tools like our Text Editor and JSONL Viewer, processing happens locally in your browser session. We don't store your sensitive inputs on our servers.
Developer-Friendly Tools
From Base64 encoding to JSONL inspection, we focus on providing high-utility tools that solve common developer pain points instantly and elegantly.
Frequently Asked Questions
Are these apps free to use?
Yes, all applications on Online Apps Lab are 100% free to use. There are no registration requirements or hidden fees.
Does the site save my data?
No. Most of our tools use local browser storage (like localStorage) to persist your session data, meaning it never leaves your computer. Once you clear your browser data, your session is gone.
Do these tools work offline?
Once the page is loaded, many of our utility tools function completely offline because the logic is handled entirely by client-side JavaScript.
About Our Collection
Online Apps Lab is a professional digital laboratory dedicated to building high-performance web utilities and classic interactive experiences. Our engineering philosophy centers on modern minimalism—stripping away unnecessary complexity to provide tools that just work.
Our collection is meticulously maintained and updated to meet modern web standards. Whether you are a developer needing a quick Base64 transcode, a data scientist inspecting JSONL streams, or a gamer looking for a refined Tetris session, our laboratory provides a stable, secure, and aesthetically pleasing environment for your needs.
We leverage the latest browser capabilities to ensure cross-platform compatibility, making our apps accessible on desktops, tablets, and smartphones without any performance degradation.