What does chmod 777 mean?

chmod 777 gives read, write and execute permissions to everyone (owner, group and others). This is generally considered insecure and should only be used for temporary debugging, never in production.

What permissions should SSH keys have?

Private SSH keys should be chmod 600 (rw-------) or 400 (r--------). SSH will refuse to use keys with permissions that are too open, as this is a security risk.

Is this tool private?

Yes. The calculator runs entirely in your browser. No data is transmitted to any server.

Chmod Calculator Online Free

Calculate Unix file permissions with an interactive chmod calculator. Toggle read, write and execute permissions for owner, group and others, and see both the numeric (octal) and symbolic representations instantly.

Open Chmod Calculator

Permission Examples

chmod 755 = rwxr-xr-x
  Owner: read + write + execute
  Group: read + execute
  Others: read + execute

chmod 644 = rw-r--r--
  Owner: read + write
  Group: read
  Others: read

chmod 700 = rwx------
  Owner: read + write + execute
  Group: none
  Others: none

Common Use Cases

Setting correct permissions for web server files (644) and directories (755)
Configuring SSH key permissions (600 or 400)
Understanding permission errors in deployment scripts
Converting between numeric and symbolic chmod notation

Frequently Asked Questions

What does chmod 777 mean?: chmod 777 gives read, write and execute permissions to everyone (owner, group and others). This is generally considered insecure and should only be used for temporary debugging, never in production.
What permissions should SSH keys have?: Private SSH keys should be chmod 600 (rw-------) or 400 (r--------). SSH will refuse to use keys with permissions that are too open, as this is a security risk.
Is this tool private?: Yes. The calculator runs entirely in your browser. No data is transmitted to any server.