Calculate Linux file permission octal and symbolic notation visually.
How to Use Chmod Calculator
Check or uncheck the read/write/execute boxes for Owner, Group, and Others.
The tool instantly calculates both the octal number (e.g. 755) and the symbolic notation (e.g. `rwxr-xr-x`).
Copy the `chmod` command shown, ready to paste into your terminal.
Key Features & Practical Use Cases
Translating Linux file permission requirements into the correct octal chmod code.
Understanding what a given chmod number (like 755 or 644) actually grants to owner, group, and others.
Setting up correct server file/folder permissions when deploying a web application.
Frequently Asked Questions
What does "755" actually mean?
It grants the owner full read/write/execute access, while group and others get read+execute only — a common permission set for scripts and executable files.
What's a safe default for a typical file vs. a folder?
Files commonly use 644 (owner read/write, everyone else read-only) while directories commonly use 755 (execute permission is needed on directories to allow listing/entering them).
Does this also generate the symbolic form like `chmod u+x`?
It shows the symbolic permission string (`rwxr-xr-x`) for reference; the copyable command uses the numeric octal form, which is the more common convention.
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