Docs

Docs

What Is a MOBI File? Kindle’s Old Format, and What to Do With One Now

Amazon retired MOBI in 2022. Files you already have still open on devices that already have them, but you cannot send ne...

Nov 1, 2026 4 min

Docs

What Is an ICS File? The Calendar Invitation, Opened Up

Every meeting invite you receive is a small text file. Understanding four things inside it explains duplicate events, me...

Nov 1, 2026 5 min

Docs

What Is XML? Not Dead — Just Hiding Inside Files You Use Every Day

People say JSON replaced XML. It replaced it for data. XML still runs your Word documents, your ebooks, your SVG logos a...

Nov 1, 2026 5 min

Docs

What Is JSON? The Format Your Data Arrives In When You Download It

Ask any service for a copy of your data and you will probably get JSON. It has only six kinds of value, no comments at a...

Nov 1, 2026 5 min

Docs

What Is a CSV File? The Simplest Format, and the One That Eats Your Data

A CSV is a text file where each line is a row. That simplicity is why it is everywhere — and why it silently destroys le...

Nov 1, 2026 4 min

Docs

What Is Markdown? Plain Text That Already Looks Like What It Means

A heading is a line starting with #. Bold is **two asterisks**. That is nearly the whole format — and it is why Markdown...

Nov 1, 2026 4 min

Docs

What Is EPUB? It’s a Website in a Zip File

Rename an .epub to .zip and open it — inside you will find HTML and CSS. Knowing that explains everything the format doe...

Nov 1, 2026 5 min

Docs

CSV vs XLSX: What You Lose When You Save As CSV

CSV holds values and nothing else — no formulas, no formatting, no sheets. It also quietly mangles phone numbers and dat...

Nov 1, 2026 4 min

Docs

What Is an ODT File? The Open Document Format Explained

.odt stands for OpenDocument Text — the native document format of LibreOffice, OpenOffice, and other open-source office ...

Oct 13, 2026 4 min

Docs

What Is an RTF File?

Long before DOCX became the office standard, before PDF was everywhere, and when exchanging a formatted Word document be...

Oct 13, 2026 4 min

Docs

What Is a TXT File? Plain Text Explained

Among all computer file formats, .txt is the simplest, oldest, and most underestimated. No bold text. No fonts. No color...

Oct 13, 2026 5 min

Docs

DOC vs DOCX: What’s the Difference?

If you've ever opened a dusty old Word file only to see a "Compatibility Mode" banner at the top of your screen, you've ...

Oct 13, 2026 4 min