Todas las guías
50 guías para sacarle el máximo a las herramientas online gratis — tutoriales paso a paso, explicaciones detalladas, comparaciones y consejos.
How to Encode and Decode Base64 — Guía completa
Learn what Base64 encoding is, how it works, when to use it, and how to encode and decode Base64 in your browser —no tools or signup needed.
comparisonBase64 vs Codificación Hex: ¿Cuál debería usar?
Compare Base64 and Hex encoding across efficiency, readability, use cases, and trade-offs — and learn when to pick each for binary-to-text encoding.
explanationFormatos de color explicados: HEX, RGB y HSL
Understand the three most common web color formats —HEX, RGB, and HSL —how each represents color, when to use which, and how to convert between them.
comparisonCSV vs TSV: ¿Qué formato de delimitador debería usar?
Compare CSV and TSV across delimiter choice, escaping, compatibility, and use cases — and learn when to pick each for tabular data.
referenceRegistros DNS explicados: A, AAAA, MX, TXT, CNAME, NS
A complete reference guide to DNS record types —A, AAAA, MX, TXT, CNAME, and NS —with examples, use cases, and how to look them up.
explanationAlgoritmos de hash explicados: MD5, SHA-1, SHA-256, SHA-512
Understand cryptographic hash functions: differences between MD5, SHA-1, SHA-256, and SHA-512, and which to use for integrity checks vs password storage.
how-toCómo Compress Images Without Losing Quality
Step-by-step guide to compressing images (JPEG, PNG, WebP) to reduce file size without visible quality loss using a free browser-based tool.
how-toCómo Compress PDF Files Step by Step
Step-by-step guide to compressing PDF files to reduce file size using a free browser-based tool. Learn compression levels and what affects PDF size.
how-toCómo Convert Colors Between HEX, RGB, and HSL
Step-by-step guide to converting colors between HEX, RGB, HSL, and other formats using a free browser-based tool. Learn when to use each format.
how-toCómo Convert CSV to JSON Step by Step
Step-by-step guide to converting CSV data to JSON using a free browser-based tool. Learn header handling, nested structures, and common pitfalls.
how-toCómo Convert Markdown to HTML Step by Step
Step-by-step guide to converting Markdown text to HTML using a free browser-based tool. Learn syntax, extensions, and common use cases.
how-toCómo Convert Text to Binary and Back Step by Step
Step-by-step guide to converting text to binary (0s and 1s) and decoding binary back to text using a free browser-based tool. Learn ASCII and UTF-8.
how-toCómo Convert Unix Timestamps to Human-Readable Dates (Step-by-Step)
Step-by-step guide to converting Unix timestamps (epoch) to human-readable dates and back using a free browser-based tool. Learn seconds vs milliseconds.
how-toCómo Decode JWT Tokens and Inspect Claims Safely
Step-by-step guide to decoding JWT (JSON Web Token) tokens and inspecting their header and payload claims using a free browser-based tool. Learn security boundaries.
how-toCómo Encode and Decode Base64 Strings Step by Step
Step-by-step guide to encoding text to Base64 and decoding Base64 back to text using a free browser-based tool. No upload, no signup, fully private.
how-toCómo Encode and Decode URLs Step by Step
Step-by-step guide to URL encoding (percent-encoding) and decoding using a free browser-based tool. Learn why and when to encode URLs.
how-toCómo Extract Text from PDF Files Step by Step
Step-by-step guide to extracting text content from a PDF file using a free browser-based tool. Learn scanned vs digital PDFs.
how-toCómo Format and Validate JSON Data Step by Step
Step-by-step guide to formatting (beautifying) and validating JSON data using a free browser-based tool. Catch syntax errors, minify, and pretty-print JSON instantly.
how-toCómo Generate Hash Values Step by Step
Step-by-step guide to generating cryptographic hash values (SHA-256, SHA-1, MD5) using a free browser-based tool. Learn use cases and security tradeoffs.
how-toCómo Generate Secure Passwords Step by Step
Step-by-step guide to generating strong, random passwords using a free browser-based tool. Learn password length, character sets, and security best practices.
how-toCómo Generate UUIDs Step by Step
Step-by-step guide to generating UUIDs (Universally Unique Identifiers) using a free browser-based tool. Learn UUID v4, v1, and when to use each.
how-toCómo Merge PDF Files Step by Step
Step-by-step guide to merging (combining) multiple PDF files into one using a free browser-based tool. Learn ordering and page ranges.
how-toCómo Resize Images Step by Step
Step-by-step guide to resizing images (change width and height) using a free browser-based tool. Learn aspect ratio, upscaling, and common dimensions.
how-toCómo Split PDF Files Step by Step
Step-by-step guide to splitting a PDF file into multiple parts or extracting specific pages using a free browser-based tool.
how-toCómo Test Regular Expressions Step by Step
Step-by-step guide to testing and debugging regular expressions using a free browser-based tool. Learn flags, capture groups, and common patterns.
how-toCómo Use a Color Picker to Find Colors from Any Pixel
Step-by-step guide to using a color picker to find the exact color (HEX, RGB, HSL) of any pixel in an image or on screen using a free browser-based tool.
explanationMejores prácticas de formato JSON: legible, válido y eficiente
Understand the conventions for formatting JSON: indentation, key ordering, minification, trailing commas, and when to pretty-print vs minify.
explanationComprender JSON: Una guía para principiantes sobre formato y validación
Aprende qué es JSON, sus reglas de sintaxis, tipos de datos comunes y cómo formatear y validar datos JSON usando herramientas online gratuitas.
comparisonJSON vs XML: ¿Qué formato de datos debería usar?
Compare JSON and XML across syntax, verbosity, parsing speed, ecosystem support, and use cases — and learn when to pick each.
comparisonJSON vs YAML: ¿Qué formato de configuración debería usar?
Compare JSON and YAML across readability, features, use cases, and trade-offs — and learn when to pick each for configuration and data interchange.
how-toCómo Decode a JWT and Inspect Its Claims Safely
Learn the three-part structure of a JSON Web Token, how to decode the header and payload without verifying, and why decoding is not the same as trusting.
comparisonMarkdown vs HTML: ¿Cuál debería usar para contenido?
Compare Markdown and HTML across readability, expressiveness, learning curve, use cases, and rendering —and learn when to pick each (or both).
problem-solvingSeguridad de contraseñas: Cómo generar, almacenar y auditar contraseñas fuertes
Solve the most common password security problems: generating strong passwords, hashing them correctly, avoiding reuse, and auditing existing credentials.
comparisonCompresor PDF vs Compresor de imágenes: ¿Cuál necesita?
Compare PDF and Image compression across targets, techniques, quality trade-offs, and use cases — and learn which tool to use for your file size problem.
referenceHoja de referencia de expresiones regulares: sintaxis, banderas y patrones comunes
Complete regex reference: metacharacters, character classes, quantifiers, anchors, groups, flags, and ready-to-use patterns for emails, URLs, and dates.
how-toCómo Convert Unix Timestamps to Human-Readable Dates
Learn what a Unix timestamp is, how to convert it to a human-readable date and back, and how to handle time zones correctly when working with epoch time.
referenceReferencia de conversión de unidades: longitud, masa, temperatura y área
A complete reference of conversion factors for length, mass/weight, temperature, and area, with exact formulas and worked examples for each.
how-toHow to Encode and Decode URLs — Guía completa
Learn what URL encoding (percent-encoding) is, why it is required, and how to encode and decode URLs in your browser —no signup, fully private.
comparisonUUID v1 vs v4 vs v5: ¿Qué versión debería usar?
Compare UUID versions 1, 4, and 5: how each is generated, their trade-offs in uniqueness, ordering, and determinism, and which to pick for your use case.
explanation¿Qué es la codificación Base64? Una explicación completa
A clear explanation of what Base64 encoding is, how it works, its character set, and why it is not encryption.
explanation¿Qué es CSV? Una explicación completa de valores separados por comas
A clear explanation of what CSV (Comma-Separated Values) is, its syntax rules, common variations, and when to use CSV vs JSON.
explanation¿Qué es el hash? Una explicación completa de funciones hash
A clear explanation of what hashing is, properties of cryptographic hash functions, common algorithms (SHA-256, MD5), and use cases.
explanation¿Qué es JSON? Una explicación completa de JavaScript Object Notation
A clear explanation of what JSON (JavaScript Object Notation) is, its syntax, data types, history, and why it replaced XML as the web's data format.
explanation¿Qué es un JWT? Una explicación completa de JSON Web Tokens
A clear explanation of what a JWT (JSON Web Token) is, its three-part structure, how it is used for authentication, and security considerations.
explanation¿Qué es Markdown? Una explicación completa del lenguaje de marcado ligero
A clear explanation of what Markdown is, its syntax, why it is popular for documentation, and how it converts to HTML.
explanation¿Qué es una expresión regular? Una explicación completa
A clear explanation of what a regular expression (regex) is, its syntax, common use cases, and why regex is powerful but hard to read.
explanation¿Qué es una marca de tiempo Unix? Una explicación completa del tiempo epoch
A clear explanation of what a Unix timestamp is, the Unix epoch, seconds vs milliseconds, and the Year 2038 problem.
explanation¿Qué es la codificación URL? Una explicación completa de la codificación porcentual
A clear explanation of what URL encoding (percent-encoding) is, which characters need encoding, and how it works.
explanation¿Qué es un UUID? Una explicación completa de identificadores únicos universales
A clear explanation of what a UUID is, its versions (v1, v4, v5), structure, collision probability, and when to use UUIDs.
how-toCómo Count Words, Characters, and Reading Time Accurately
Learn how word and character counts are defined across languages, how to estimate reading time, and how to use a counter to hit limits for essays, tweets, and meta descriptions.