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Chmod Calculator

The problem: Your script will not run, the server says “permission denied”, and you cannot remember whether you need 755, 644 or 777 — so you guess, and break security instead.

How to use — quick guide

Tick the read, write and execute boxes for owner, group and others in this chmod calculator and the numeric code, symbolic form and ready-to-paste chmod command update instantly. Or type a code like 755 and watch the boxes set themselves, so you learn what it really means. Free, no signup, works in your browser.

How to use it

  1. Tick read / write / execute for owner, group and others.
  2. The numeric code, symbolic form and ready-to-paste chmod command update instantly.
  3. Or type a number like 755 and the boxes set themselves.

Frequently asked questions

What does 755 mean?

Owner can read, write and execute (7); group and others can read and execute (5). It is the standard for folders and scripts.

Why is 777 dangerous?

777 lets anyone on the system modify and run the file — a real security hole on shared servers.

What should normal files be?

644 — owner can edit, everyone else can only read.

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