chmod Calculator

RoleReadWriteExecute
owner
group
other
Numeric
644
Symbolic
rw-r--r--

What This Tool Does

chmod Calculator is built for deterministic developer and agent workflows.

Visual Unix permission calculator with bidirectional numeric and symbolic chmod conversion plus common presets.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Dedicated API endpoint

Deterministic outputs, machine-safe contracts, and production-ready examples.

Dedicated API

https://aidevhub.io/api/chmod-calculator/

OpenAPI: https://aidevhub.io/api/openapi.yaml

GET /api/chmod-calculator/ GET chmod-calculator
POST /api/chmod-calculator/ POST chmod-calculator

Unified Runtime API

https://aidevhub.io/api/tools/run/?toolId=chmod-calculator&a=...

GET and POST are supported at /api/tools/run/ with identical validation and limits.

Limit: req / s, input max 128 KB.

How to Use chmod Calculator

  1. 1

    Start from a preset or type numeric mode

    Pick a common preset such as 644 or 755, or type a numeric mode directly in the input. The grid updates as soon as the mode is valid.

  2. 2

    Adjust Owner/Group/Other checkboxes

    Toggle Read, Write, and Execute checkboxes for each role. Numeric mode and symbolic permissions update instantly from checkbox changes.

  3. 3

    Use bidirectional conversion

    Edit numeric mode to drive the grid, or edit the grid to drive numeric mode. This helps verify permissions before running chmod in a terminal.

  4. 4

    Copy numeric, symbolic, or both

    Copy each format individually or copy both formats together for docs, shell commands, and permission reviews.

Frequently Asked Questions

How does the numeric chmod value map to rwx?
Each digit is read, write, execute as 4, 2, 1. For example, 7 means rwx, 5 means r-x, and 4 means r--.
Can I edit permissions both ways?
Yes. Typing a numeric mode updates the checkbox grid, and toggling checkboxes updates the numeric mode instantly.
Which chmod presets are included?
The calculator includes common presets: 644, 755, 777, 600, 700, and 400.
Can I copy numeric and symbolic results?
Yes. You can copy numeric mode, symbolic mode, or both formats together for terminal usage and documentation.