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Chmod Calculator

100% Free

Toggle rwx for owner/group/other — get octal and symbolic chmod modes.

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Client-Side
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Owner (u)
Group (g)
Other (o)

Mode

chmod
755

-rwxr-xr-x

Example: chmod 755 file

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<iframe
  src="https://tools.town/embed/chmod-calculator/"
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  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Chmod Calculator">
</iframe>

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How to Use

  1. 1 Toggle read/write/execute for owner, group, and other
  2. 2 Or type a 3-digit octal and click Apply
  3. 3 Copy the octal mode into chmod
  4. 4 Use presets 755 / 644 / 700 / 777

Features

  • Checkbox triads
  • Octal + symbolic output
  • Presets for common modes
  • Round-trip from octal
  • Client-side

Why it Matters

Hosting panels and SSH sessions still live on octal permissions. Building 755 from checkboxes beats memorizing bit math every time.

★★★★★

Build Unix file modes visually, or decode an octal string like 755 into rwx flags.

Frequently Asked Questions

What about sticky/setuid?
Not included — classic 3-digit ugo only.
Is 777 safe?
Almost never on shared hosts. Prefer 755 for dirs and 644 for files.
Windows?
This models Unix modes; NTFS ACLs differ.
📖

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