Organizing hundreds of plain text files can become difficult without a clear plan. The Johnny.Decimal system is a practical way to arrange your documents using numbers instead of vague names, ensuring you always know exactly where to find your notes.
Structure Your Text Files
Vague folder names like "Work" or "Misc" quickly lead to a messy computer screen. By assigning a strict numerical code to your folders and files, you build a simple, permanent home for your text data that works on any device.
Core Number Setup
Divide your entire life into a few broad parts to create the foundation of your system.
Top Categories
Break your information down into a maximum of ten large areas using tens digits.
Start by looking at everything you need to organize and group them into major buckets. Assign a double digit number ending in zero to each bucket. For example, use 10-19 for Personal Finance, 20-29 for Home Maintenance, and 30-39 for Work Projects. Limiting yourself to ten main categories prevents your system from becoming too wide and confusing.
Clear Sub Folders
Break each main category down into ten smaller topics using single digits.
Inside each large area, create up to ten specific folders. If your main category is 10-19 Personal Finance, you can create subfolders like 11 Banking, 12 Taxes, and 13 Insurance. The first digit always matches the main category, while the second digit specifies the subtopic. This gives you a neat, logical hierarchy that numbers your topics from 11 to 99.
Decimal File Rules
Assign unique numbers to individual text documents to keep them in a strict permanent sequence.
Exact File Numbers
Add a dot and a two digit number to the end of your folder code for single notes.
When you create a plain text file inside a subfolder, you give it a unique decimal number starting at .01. If you are saving a note about your 2026 tax return inside the 12 Taxes folder, the file number becomes 12.01. The next note in that same folder becomes 12.02. This decimal number acts as a permanent serial number for that specific note.
Short Text Labels
Include a brief title after the decimal number to describe the file contents.
Do not leave your files labeled with numbers alone. After the decimal code, add a short dash and a few clear words explaining the note. For example, name your file 12.01-2026-Tax-Return-Notes.txt. Keep the text short and direct. The number keeps the file in perfect numerical order, while the label tells your eyes exactly what is inside the document.
Flat Folder Depth
Keep your directory layout shallow so you never have to click through endless layers.
Two Layer Limit
Never create folders inside folders past the main subfolder level.
The power of this system relies on its strict two layer depth: Category followed by Subfolder, then the text file. Do not create deeper folders like 10/12/Taxes/2026/Files. Deep folder trees make it easy to hide files and hard to remember where things live. Keeping your structure flat forces you to view all your notes clearly in one screen.
Clean Asset Group
Keep supporting items like images in the same folder using the matching text number.
Because plain text files cannot hold images or spreadsheets, save supporting assets as separate files in the same subfolder. Name the image using the exact number of the text note it belongs to, such as 12.01-Tax-Receipt.jpg. This keeps your text data and visual assets grouped together neatly without breaking your shallow folder rules.
Master Index Files
Maintain a central directory map so you can look up your category numbers instantly.
One Map Document
Keep a single plain text file at the root level to list every active folder number.
Create a plain text file named 00.00-Master-Index.txt and place it at the very top of your notes directory. Inside this file, type a clean list of all your active categories and subfolders. If you forget where your insurance notes live, you simply open this index file to see that 13 Insurance is the correct folder to open.
Fast New Codes
Check your master map before creating a new folder to pick the next open number.
Whenever you need to start saving notes on a brand new topic, open your master index file first. Look for the next unused number in that category. If 13 was your last subfolder, assign 14 to the new topic, type the label into the master index, and create the new folder on your computer. This prevents you from accidentally repeating numbers.
Search And Sort
Locate your information rapidly using the numerical advantages of the system.
Fast Number Scan
Type the short decimal code into your computer search bar to find files instantly.
Because every file name starts with a highly specific number, finding a note is incredibly fast. If you know your car maintenance history is stored under 21.04, you do not need to click through folders. Simply open your operating system’s basic search bar, type 21.04, and press enter. The exact text file will appear instantly on your screen, bypassing menus.
Native Order View
Allow your computer to sort your files numerically so they never look messy.
Computers naturally sort files by numbers first, then by letters. By starting every folder and text file name with a Johnny.Decimal number, your computer will automatically display your notes in a clean, permanent order. Your files will never shift around based on when you edited them last, giving you a stable digital workspace that stays neat forever.