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DEVELOPER TOOLS

Unix chmod Permissions Calculator

Convert Unix permissions between numeric modes such as 755, symbolic rwx notation, and visual owner/group/others checkboxes, including setuid, setgid, and sticky bits.

Tool statusRuns in your browser
Preview

Inputs

Visual permissionsReadWriteExecute
Owner
Group
Others
Special bits

Special bits affect executable files and shared directories; this tool only explains the mode.

Results

Numeric mode
755
Symbolic mode
rwxr-xr-x

Explanation

  • OwnerRead, Write, Execute
  • GroupRead, Execute
  • OthersRead, Execute

Note: In directories, the execute (x) bit allows users to enter the folder.

Examples

How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is Unix chmod Permissions Calculator?

Convert between numeric chmod modes, symbolic rwx notation, and visual checkboxes for owner, group, and others.

UNDERSTAND THE TOOL

How Unix chmod permissions work

Permission digits

Each chmod digit is a sum: read is 4, write is 2, and execute is 1. A digit of 7 means read, write, and execute; 5 means read and execute.

Common mode

755 means owner can read/write/execute, group and others can read/execute.

Special bits

setuid, setgid, and sticky are represented by an optional leading octal digit and affect executable files or shared directories in specific Unix contexts.

No commands are run

The tool only converts and explains permissions. It never executes chmod or accesses your files.

Numeric and symbolic example

Digit value
read(4) + write(2) + execute(1)

644

644 becomes rw-r--r--: owner can read/write, group and others can read only.

6 = 4 + 2; 4 = read; 4 = read

Permission conversion notes

The tool converts octal, symbolic, and checkbox states only. It never reads your filesystem or runs chmod on any local or server file.

Frequently Asked Questions

What does chmod 644 mean?

The owner can read and write, while group and others can only read.

What does chmod 755 mean?

The owner can read, write, and execute, while group and others can read and execute.

Does this change file permissions?

No. It only generates and explains permission modes.

What do capital S and T mean in symbolic permissions?

They mean a special bit is set but the matching execute bit is not. For example S can appear where setuid or setgid exists without execute permission.

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