About Colección de Herramientas en Línea
Free, privacy-focused online tools built with modern web standards
Our Mission
Colección de Herramientas en Línea provides 257+ free online utilities across 11 categories, designed to help developers, designers, content creators, and everyday users accomplish tasks quickly and securely. We believe essential tools should be accessible to everyone without paywalls, account requirements, or privacy compromises.
Every tool runs entirely in your browser. Your data never leaves your device unless explicitly required (such as network lookup tools). No tracking, no ads, no data collection.
Privacy & Security First
Text manipulation, encoding, hashing, and calculations happen entirely in your browser using JavaScript. Your sensitive data never touches our servers.
Use any tool immediately without registration, email verification, or login. No personal information collected.
We don't use Google Analytics, Facebook Pixel, or any third-party tracking. Your browsing behavior stays private.
Password generation and hashing use the Web Crypto API, the browser's built-in cryptographically secure random number generator.
Technical Standards & Accuracy
Our tools are built following established specifications and industry standards. Each tool page includes references to the relevant standards documents.
Standards We Follow
NIST FIPS 180-4 (SHA), RFC 2104 (HMAC), RFC 4648 (Base64)
ECMA-404 (JSON), ISO 8601 (Dates), RFC 3986 (URLs)
W3C CSS Specifications, HTML Living Standard, Schema.org
SI Units (BIPM), IEEE 754 (Floating Point)
Testing & Quality Assurance
Accuracy is essential for developer tools. Our testing methodology ensures reliable results:
Core algorithms are validated against official test vectors from RFCs and NIST publications. For example, SHA-256 is verified using NIST's published test cases.
Tools are tested across Chrome, Firefox, Safari, and Edge to ensure consistent behavior.
Empty inputs, maximum values, special characters, and Unicode are explicitly tested to prevent unexpected failures.
Automated tests run on every code change to catch regressions before deployment.
Built With Modern Technology
React framework for fast, SEO-friendly pages
Type-safe code for reliability
Responsive, accessible styling
Browser-native secure cryptography
Mozilla's PDF rendering library
No server-side processing required
Transparency
We believe in transparency. Each tool page explains exactly how it works, what algorithms it uses, and links to relevant specifications. If you're curious about implementation details, the "How It Works" section on each tool page provides technical explanations.
Have questions about our methods or found an issue? We welcome feedback via our contact page.
Tool Categories
Questions or Suggestions?
We're always looking to improve. If you have feedback, found a bug, or want to suggest a new tool, we'd love to hear from you.
Contact Us