Chmod Calculator — Unix Permissions Calculator Online, Free
Calculate Unix file permissions with an interactive chmod calculator. Toggle read/write/execute for Owner, Group, and Others. Shows numeric (755, 644) and symbolic (rwx) output. Free, no signup.
Last updated:
CommentsToggle read/write/execute for Owner, Group, and Others to see the numeric (755, 644) and symbolic (rwx) chmod values.
Owner (u)
7
Group (g)
6
Others (o)
4
chmod 764
chmod 764 file # Owner (u): rwx
chmod 764 file # Group (g): rw-
chmod 764 file # Others (o): r--What is Chmod Calculator?
Unix file permissions are represented as three octal digits, one for each user class: Owner (u), Group (g), and Others (o). Each digit is the sum of read (4), write (2), and execute (1). chmod 755 = Owner rwx, Group r-x, Others r-x. chmod 644 = Owner rw-, Group r--, Others r--.
How to use the chmod calculator
- 1Click the r/w/x toggles for each user class.
- 2The numeric code and symbolic representation update automatically.
- 3Copy the chmod command for your terminal.
Frequently Asked Questions
What does chmod 755 mean?
chmod 755 means the Owner can read, write, and execute (7=rwx), and the Group and Others can read and execute (5=r-x, 5=r-x). It's the standard permission for directories and executable scripts.
What is the most secure chmod setting?
The most restrictive is chmod 600 — only the owner can read and write; no one else can access it. For web servers, directories are typically 755 and files 644.
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