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Guides on file formats, compression and what “runs in your browser” actually means for your privacy — the background behind the tools, not just how to click the buttons.

  1. Why UUIDs Basically Never Collide (Even Without Checking)

    Systems generate random UUIDs constantly with no central coordination and no duplicate check, and it works. The birthday paradox explains why that is actually a reasonable bet.

    · 3 min read

  2. BMI Is a Population Statistic, Not a Personal Diagnosis

    BMI was built in the 1830s to describe populations for statistical purposes, not to evaluate any individual person — and most of the complaints about it follow directly from that mismatch.

    · 2 min read

  3. Why Spreadsheet CSV Exports Break When You Convert Them

    A CSV export looks like simple, obviously-structured data. The moment a real address, a leading zero, or an embedded line break shows up, that simplicity turns out to be an illusion.

    · 3 min read

  4. The Rule of 72: A Quick Mental Trick for Compound Interest (And Where It Breaks Down)

    Divide 72 by an interest rate and you get roughly how many years it takes an investment to double. It is a genuinely useful shortcut, right up until the rate gets unusual.

    · 3 min read

  5. How Word Counters Actually Count Words (And Why the Number Changes Between Apps)

    Paste the same paragraph into three different word counters and you can get three different numbers. None of them are wrong — they are answering slightly different questions.

    · 3 min read

  6. Why "It Runs in Your Browser" Actually Matters for File Privacy

    "Nothing is uploaded" is a specific, checkable technical claim, not a marketing phrase. Here is what it actually means, how it works, and how to verify it yourself.

    · 3 min read

  7. How Strong Does a Password Actually Need to Be?

    Most password advice focuses on brute-force resistance, but most real-world account compromise does not come from brute force at all. Here is what actually matters.

    · 4 min read

  8. JSON vs YAML vs XML: When to Actually Use Each One

    All three can represent the same data, but they were built for different jobs and each one is genuinely awkward at the others’ specialities. Here is how to pick.

    · 4 min read

  9. Why Is My PDF File So Large? (And How to Actually Fix It)

    A PDF is a container, not a single format — its size comes almost entirely from what got embedded inside it. Here is what actually causes PDF bloat, and what genuinely helps.

    · 4 min read

  10. JPEG vs PNG vs WebP: Which Image Format Should You Actually Use

    The three formats solve different problems, and picking the wrong one either bloats your file size or visibly degrades your image. Here is how to actually choose.

    · 5 min read