What does chmod 755 mean?

chmod 755 sets owner to read+write+execute (7), group to read+execute (5), and others to read+execute (5). In symbolic form: rwxr-xr-x. This is the standard permission for directories and executable files.

What is the difference between octal and symbolic?

Octal (755) uses three digits where each is the sum of read(4)+write(2)+execute(1). Symbolic (rwxr-xr-x) shows each permission as a letter. Both represent the same permissions.

When should I use chmod 644 vs 755?

Use 644 for regular files (owner can read/write, everyone else read-only). Use 755 for directories and executables (owner full access, everyone else can read and traverse). Never use 777 in production.

Chmod Calculator

Generators

Calculate Unix/Linux file permissions visually using a 3x3 checkbox grid (Owner/Group/Other by Read/Write/Execute). See the octal number (e.g., 755) and symbolic notation (rwxr-xr-x) update in real time. Includes common presets like 755, 644, and 700.

100% client-side processing

Octal Value

chmod 755 filename

rwxr-xr-x

Permission Grid

Read

Write

Execute

Owner

Group

Other

Common Presets

How to Use Chmod Calculator Online

Paste your data into the input field above
The result appears instantly in the output area
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Visual Unix file permission calculator with octal and symbolic notation. Runs 100% client-side — no data is sent to any server.

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