Tips, tutorials and updates
An IP lookup is fast and free, but this guide shows exactly what it can and cannot reveal before you trust the result.
Validate and format JSON in your browser with instant error positions, no upload and no account required.
Minified code that only fails in production is usually a name, string, or dead-code assumption — this guide shows you how to find and fix it fast.
Check your public and private IP addresses in seconds, understand what each one reveals, and learn when sharing it is safe.
Reformat scrambled or minified HTML in three steps, keep your markup off remote servers, and commit a clean, reviewable diff.
Compress an oversized PDF in your browser, cut it down for email or upload limits, and keep the original quality where it matters.
Convert web articles to Markdown without broken formatting, lost links or stray navigation, and get clean files ready for notes, docs or a static site.
Convert CSV files to clean JSON with deliberate field mapping and column-level type handling that keeps identifiers, dates, and empty cells intact.
Check any URL's HTTP status code and headers instantly in your browser, then match the result to the exact cause and fix.
Compress a PDF correctly by identifying what is inside, choosing the right method, and checking the result before you send it.
Merge PDF contracts in bulk while keeping page order and page numbers intact, using a prepare-then-merge workflow that works entirely in your browser.
Get a clear framework for reading BMI and body fat percentage as an athlete, so you can track real progress instead of reacting to a single misleading number.
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Hands-on tutorials broken down by tool: what problem each one solves, how to use it, and the pitfalls to avoid — with step-by-step instructions you can follow right away.
The details that double your efficiency: shortcuts, parameter combinations, batch-processing approaches and the habits that genuinely save time at work.
Technical deep dives into encoding, data formats and engineering practice — focused on principles and reasoning rather than recipes.
Free text processing, PDF tools, AI writing and more