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In-depth articles on interview preparation, web development, and the technology behind our tools.
PDFs are the most sensitive files people routinely feed to random online tools — contracts, IDs, bank statements. Modern browsers can merge, reorder, and convert PDFs locally. Here is how that works and how to do it safely.
Talha Mahmood
Jul 16, 2026
API is the most-used and least-explained term in software. What an API actually is, how a real request works step by step, why companies build them, and the vocabulary — REST, endpoints, keys, rate limits — decoded without jargon.
Talha Mahmood
Jul 14, 2026
Base64 is one of the most-used and most-misunderstood encodings in development — routinely mistaken for encryption, blamed for bloat it did not cause, and used where it should not be. A clear explanation with the real trade-offs.
Talha Mahmood
Jul 12, 2026
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