
Free Linux & developer tools
Find a calculator by name, task or category. Practical tools with clear explanations, ready when you need them.
Explore the toolbox
1 tool available1 tool
Try a broader term such as “permissions” or choose All categories.
Start with an example
The calculator opens with working defaults. Explore a common permission mode, then adjust it to your own task.
Understand the result
See what each permission allows, read the limits and review the command before using it on your system.
Keep your inputs local
The chmod calculator processes paths and permission values in your browser. There is no upload or account step.
Tools with the context
to use them well.
A correct permission number is only part of the job. Ownership, directory access and the service user matter too. Our practical guides help you apply the result.
Set up SSH key authentication Work through Linux server hardening



