What does chmod 755 mean?

chmod 755 means: Owner has read (4) + write (2) + execute (1) = 7. Group has read (4) + execute (1) = 5. Others have read (4) + execute (1) = 5. Common for web server directories and executable scripts.

What is chmod 644 used for?

644 means owner can read and write (6), group and others can only read (4). This is the standard permission for web files like HTML, CSS, and JS — the server can read them, but no one can accidentally execute or overwrite them.

What does the execute bit mean for directories?

For directories, the execute bit means 'can enter this directory' (traverse permission). Without execute on a directory, users cannot cd into it or access files inside it, even if they have read permission on the directory itself.

家工具Chmod Calculator

Chmod 计算器

Name: Chmod 计算器
Rating: 4.8 (120 reviews)
Author: DailyDevTools

计算Linux文件权限

所有者

团体

民众

数字

755

象征性的

rwxr-xr-x

chmod 755 filename

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What is Chmod Calculator?

Unix file permissions use an octal (base-8) number or symbolic notation to define read (r=4), write (w=2), and execute (x=1) access for the owner, group, and others. Remembering what chmod 755 or 644 means requires experience. DailyDevTools' chmod Calculator translates between octal codes, symbolic notation (rwxr-xr--), and plain English descriptions — instantly.

How to use Chmod Calculator

1Enter an octal code (e.g., 755, 644, 777) to see the permissions it represents
2Or toggle the read/write/execute checkboxes for owner, group, and others to build permissions visually
3See the equivalent symbolic notation (rwxr-xr-x) and what each group can do in plain English
4Copy the chmod command (chmod 755 filename) ready to run in your terminal

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