Online Chmod Calculator & Generator

Calculate Linux file permissions instantly. Use our visual toggle switches to set Read, Write, and Execute rights for Owner, Group, and Public.

The tool automatically generates the corresponding Octal Code(e.g., 755) and Symbolic Notation (e.g., -rwxr-xr-x) for use with the chmod command in Unix-like systems.

Standard Permissions

755
Web Folders: Readable/Executable by everyone, writable only by owner. Standard for /var/www.
644
Web Files: Readable by everyone, writable only by owner. Standard for `.html`, `.css`, `.php` files.
777
Full Access: Dangerous. Everyone can read, write, and execute. Avoid in production.

Special Bits Guide

SetUID (4)
Runs the executable with the permissions of the file owner (e.g. root) instead of the user running it. Used for commands like passwd.
Sticky (1)
Restricts file deletion in shared directories. Only the file owner can delete their own files. Standard for /tmp.

Octal Value Reference

Read (r) 4

Write (w) 2

Execute (x) 1

None (-) 0

Common Questions

What does -R mean?

The -R flag stands for Recursive. It applies the permission changes to the target directory and all files and subdirectories inside it.

How to reset permissions?

If you messed up permissions, a safe default for most web servers is:
Directories: find . -type d -exec chmod 755 {} \;
Files: find . -type f -exec chmod 644 {} \;

Chmod Calculator

Advanced Special Bits

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