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Short, accurate explanations of the formats and concepts behind everyday digital tasks. Each article links to the Utilumo tool that does the job.
Images
Explainer2 min readWhat is EXIF metadata?EXIF is the hidden metadata cameras and phones write into photos, including GPS location, device model, and timestamps. Here is what it stores and how to remove it.Read
Guide1 min readHow to compress images for the webA practical guide to making images smaller without obvious quality loss: choosing lossy vs lossless, resizing first, picking a format, and tuning quality.Read
Comparison1 min readPNG vs JPG: which should you use?PNG is lossless with transparency, ideal for graphics and screenshots. JPG is lossy and smaller, ideal for photos. Here is how to choose.Read
Comparison1 min readWebP vs AVIF: which modern image format wins?AVIF usually compresses smaller and supports HDR, while WebP encodes faster and has slightly broader support. Here is how to choose between them.Read
Developer
Explainer1 min readWhat is JSON?JSON is a lightweight, text-based format for storing and exchanging structured data. Here is how it works, its data types, and the rules that trip people up.Read
Explainer1 min readWhat is Base64 encoding?Base64 encodes binary data into plain ASCII text so it can travel safely through systems built for text. It is encoding, not encryption.Read
Explainer1 min readJWT explained: how JSON Web Tokens workA JWT is a signed, Base64url-encoded token with three parts: header, payload, and signature. Here is what each part holds and why decoding is not verifying.Read
Explainer1 min readWhat is a UUID?A UUID is a 128-bit identifier that is unique without a central authority. Here is how UUID v4 works, why collisions are effectively impossible, and when to use it.Read
Guide1 min readCron syntax explained with examplesCron schedules use five fields: minute, hour, day of month, month, and day of week. Here is what each field means, the special characters, and ready-to-use examples.Read
Guide1 min readHow to convert CSV to JSONTurn spreadsheet-style CSV rows into an array of JSON objects: how the header row becomes keys, how to handle quotes and commas, and common pitfalls.Read
Explainer1 min readWhat is hexadecimal?Hexadecimal is base 16, a compact way to write binary. Here is how hex maps to bits and bytes, why colors and memory use it, and how to convert it.Read
Text
Comparison1 min readcamelCase vs snake_case vs kebab-caseA quick reference to the common programming naming styles, where each one is conventional, and how to convert text between them.Read
Explainer1 min readHow is reading time calculated?Reading time is an estimate based on word count and an average reading speed. Here is the formula, the typical speeds used, and why it is only an estimate.Read
Calculators
Explainer1 min readCommon aspect ratios explainedAn aspect ratio is the proportion of width to height. Here is what 16:9, 4:3, 1:1, and 9:16 mean and where each is used.Read
Guide1 min readHow to calculate percentage changePercentage change measures how much a value grew or shrank relative to its starting point. Here is the formula, worked examples, and the mistakes to avoid.Read
Browser
Explainer1 min readThe anatomy of a URLEvery URL is made of parts: scheme, host, port, path, query, and fragment. Here is what each piece does, with a labelled example.Read
Explainer1 min readWhat is URL encoding (percent-encoding)?URL encoding replaces unsafe characters with a percent sign and a hex code so they can travel safely inside a URL. Here is how and when it happens.Read
AI Utilities
Explainer1 min readWhat is a token in AI language models?Language models read text as tokens, not words. Here is what a token is, why a word can be several tokens, and why counts vary by model.Read
Explainer1 min readWhat is a context window?A context window is the maximum amount of text, measured in tokens, that a language model can consider at once. Here is what it includes and why it matters.Read
Creator
Guide1 min readHow to write a good YouTube descriptionA practical structure for YouTube descriptions: a strong first line, useful links, working chapter timestamps, and clean spacing that survives the player.Read
Guide1 min readSocial media image sizes that work everywhereThink in aspect ratios first, then resolution. Here are the dependable shapes for feeds, stories, and thumbnails, and why ratios outlast exact pixel specs.Read
Productivity
Explainer1 min readWhat is the Pomodoro Technique?The Pomodoro Technique breaks work into focused intervals separated by short breaks. Here is how the cycle works and why the breaks are the point.Read
Explainer1 min readWhat is an .ics calendar file?An .ics file is a plain-text calendar in the iCalendar format that any major calendar app can read. Here is what is inside one and how events are identified.Read