What does chmod 755 mean?

7 (owner: rwx), 5 (group: r-x), 5 (others: r-x). Owner can read/write/execute; group and others can read/execute only.

What's the difference between 644 and 755?

644 is for files (no execute). 755 is for directories or executables. The execute bit allows directory access or script execution.

Why is 777 dangerous?

777 gives everyone full access including write. Any user could modify or delete the file. Use 755 for directories, 644 for files.

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Chmod Calculator

Calculate file permissions in octal and symbolic notation

About Chmod Calculator

What is Chmod Calculator?

Calculate and convert file permissions between octal (755) and symbolic (rwxr-xr-x) notation. Understand what each permission level means for owner, group, and others.

Features & Benefits

Octal to symbolic conversion
Interactive permission builder
Owner/group/other breakdown
Common permission presets
Security recommendations
chmod command output

Frequently Asked Questions

What does chmod 755 mean?: 7 (owner: rwx), 5 (group: r-x), 5 (others: r-x). Owner can read/write/execute; group and others can read/execute only.
What's the difference between 644 and 755?: 644 is for files (no execute). 755 is for directories or executables. The execute bit allows directory access or script execution.
Why is 777 dangerous?: 777 gives everyone full access including write. Any user could modify or delete the file. Use 755 for directories, 644 for files.