Articles & tutorials about web development
Learn how to read and understand cron expressions. Decode any crontab schedule with our expression parser and master spe...
Learn how to combine multiple images into a single file. Merge horizontally, vertically, or in a grid online or programm...
Learn how to remove unwanted pages from PDF files online. Delete pages by number or range, extract only what you need, a...
Learn how to convert RGB to Hex and between color formats (RGB, HEX, HSL, CMYK). Includes code examples, conversion form...
Learn how to split PDF files online for free. Extract pages, split by page ranges, or separate every N pages — all in yo...
Learn how Unix file permissions work, read chmod octal and symbolic notation like a pro, and calculate permissions with...
Learn how to safely inspect shortened URLs before clicking. Expand bit.ly, tinyurl, and other short links, view redirect...
Learn what an SMS counter is, how GSM 7-bit and UCS-2 encoding work, and why character count matters for SMS delivery an...
Learn the fundamentals of binary encoding, how computers represent data as 0s and 1s, and how to convert between binary...
Learn how to compare and verify cryptographic hashes to check file integrity, validate downloads, and detect data tamper...
Learn how to encode and decode HTML entities in PHP, JavaScript, Python, Ruby, and Java with complete code examples.
Learn how to properly escape and unescape JSON strings in JavaScript, PHP, Python, and other languages with real-world e...