Chmod Calculator
Convert between numeric (755) and symbolic (u=rwx,g=rx,o=rx) chmod permission formats. See detailed breakdown for owner, group, and others. Code never leaves your device — formatting and validation run locally in your browser.
How to Use the Chmod Calculator
Similar Tools You Might Need
See allHex ↔ ASCII Converter
Convert between hexadecimal bytes and ASCII text. Supports custom delimiters and real-time bidirectional conversion. Code never leaves your device — formatting and validation run locally in your browser.
String Inspector
Inspect any string — view character count, byte length, word count, line count, Unicode code points, and non-ASCII character breakdown.
PHP Tools
Convert between JSON and PHP arrays, and serialize/unserialize PHP data. All four operations in one tool with instant swap.
Salary Calculator
Calculate net salary after taxes — enter gross salary, deductions, and tax brackets to see your take-home pay with a full breakdown.
JSON to XML
Converts JSON files to XML format — APIs, configuration files, and data exchange between web services to enterprise systems, SOAP APIs, document formatting, and legacy integration pipelines.
Frequently Asked Questions
What's the difference between numeric and symbolic notation?
Numeric uses octal digits (e.g., 755), while symbolic uses letters (e.g., u=rwx,g=rx,o=rx). Both represent the same permissions.
What permissions does each digit represent?
Read (4), write (2), and execute (1). Add them together: 4+2+1=7 (full), 4+0+1=5 (read+execute), etc.
Can I convert from symbolic to numeric?
Yes. Enter symbolic notation like u=rwx,g=rx,o=r and get the numeric equivalent (754).
Does this work for directories too?
The permission values are the same for files and directories, but the execute bit means different things (traverse for directories, execute for files).
Which input shapes and shortcuts are accepted?
Type 3 octal digits (each 0-7, validated by /^[0-7]{3}$/) or symbolic form like u=rwx,g=rx,o=rx. The 8 quick-pick buttons are 644, 755, 777, 600, 700, 444, 400, 000, and each digit decodes as r=4, w=2, x=1.
Can I use this offline?
Yes. The calculator works entirely offline after the initial page load.
Related Developer Tools
SSH Key Generator
Generate SSH key pairs (ed25519/RSA) with copy-ready public and private parts. Set up server access in a minute — local Web Crypto, free, no signup.
CIDR Calculator
Convert CIDR prefixes to masks, ranges, and host counts — /8 through /32 decoded. Answer 'how many IPs in a /22' instantly — local math, free, no signup.
Last updated October 2026