Quick reference
| Setting | Value / behavior |
|---|---|
| 644 | rw-r--r-- |
| 755 | rwxr-xr-x |
| 700 | rwx------ |
How to use the result
Each ordinary octal digit combines read as 4, write as 2 and execute as 1. The three positions describe owner, group and everyone else. For example, 6 means read plus write, while 5 means read plus execute. Mode 644 becomes rw-r--r--, and 755 becomes rwxr-xr-x. A fourth leading digit represents setuid, setgid and sticky bits. The tool changes display characters to s, S, t or T as appropriate when those bits are present.
Limits and interpretation
File and directory permissions have different practical effects. Directory execute permits traversal, while directory write can permit adding or removing entries subject to other rules. Permission bits are only one part of access control; ownership, ACLs, mount options, capabilities and security policies can matter. This calculator never executes chmod and does not recommend blanket permissions such as 777. Before applying any change, identify the service account and the minimum access it actually needs.
Check against your destination
Run the supplied example first, then replace it with a representative input from your own workflow. Change one parameter at a time so the effect is easy to inspect. Copy or download the output and compare it with a small known case before using it in a larger system. A successful calculation establishes only the behavior described on this page; it cannot check the assumptions or access rules of a remote application. Errors are shown next to the workspace rather than silently returning an empty success.
Local processing and data handling
This tool runs in the browser and does not transmit the entered content to a processing service. No input is saved to local storage, added to the URL or synchronized to an account. The clear control removes the current field and displayed result from this page. Clipboard contents and downloaded files remain under your operating system’s control. Keep original inputs when exact byte preservation matters, and avoid including sensitive tokens or private text in screenshots that you later share.
Frequently asked questions
Does the tool contact my server?
No. It processes the provided input locally and does not execute commands on your systems.
Can I download the result?
Yes. Use the Download result control after a successful run.
What happens to my input?
It remains in this page until cleared or closed. It is not saved by the tool.
About this tool
Built and maintained by Mihai at Void Fabric. This page documents the behavior of the current implementation. Found an error or an unclear assumption? Send a reproducible example with sensitive values removed.
Reference: Void Fabric field notes · Testing and editorial policy