Chmod Calculator
Calculate Unix file permissions (rwx, octal, symbolic)
Chmod Calculator is a free online tool from BrowserUtils that calculate unix file permissions (rwx, octal, symbolic). It runs entirely in your browser — your data never leaves your device. No account required.
| Read | Write | Execute | |
|---|---|---|---|
| Owner | |||
| Group | |||
| Other |
Octal
755
Symbolic
rwxr-xr-x
rwxr-xr-x — Directories, executables
rw-r--r-- — Regular files
rw------- — Private files
rwx------ — Private directories
rwxrwxrwx — Full access (avoid)
r--r--r-- — Read-only
How to use Chmod Calculator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Chmod Calculator
Free online chmod calculator. Convert between rwx, octal, and symbolic Unix file permission formats with an interactive permission grid. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Chmod Calculator specs
- Runtime
- 100% client-side (browser)
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What does chmod 755 mean?
chmod 755 sets read, write, and execute permissions for the owner, and read and execute permissions for the group and others. In symbolic notation this is rwxr-xr-x. It is the standard permission for directories and executable files.
What is the difference between octal and symbolic chmod notation?
Octal notation uses three digits (e.g., 644) where each digit represents owner, group, and other permissions as a sum of read (4), write (2), and execute (1). Symbolic notation uses letters like rwxr--r-- to represent the same permissions in a human-readable format.
What chmod permissions should I use for web server files?
For most web files, 644 (rw-r--r--) is standard, giving the owner write access and everyone else read-only. Directories and scripts that need to execute should be 755 (rwxr-xr-x). Avoid 777 as it grants full access to all users.
How do I use the chmod calculator to convert permissions?
Click the permission checkboxes for read, write, and execute for owner, group, and others. The tool instantly shows the corresponding octal number and symbolic notation that you can use in your chmod command.
Does the chmod calculator work for directories?
Yes. The same permission bits apply to directories, though execute permission on a directory means the ability to list its contents and traverse into it rather than running it as a program.
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