chmod Calculator Online — Free & Private

A free edge API by formatho.com, privacy-first developer tools.

Open the full browser tool →

Free, no signup, runs entirely in your browser — your data never leaves your device.

🔓 Free🔒 Zero tracking🚫 No data collection⚡ Edge-fast

Usage

curl "https://chmod-calculator-formatho.filesformatho.workers.dev/api?chmod=755"          # octal → symbolic + explanation
curl "https://chmod-calculator-formatho.filesformatho.workers.dev/api?chmod=rwxr-xr-x"    # symbolic → octal
curl "https://chmod-calculator-formatho.filesformatho.workers.dev/api?chmod=4755"         # 4-digit with setuid

Converts both directions (auto-detected): octal (3 or 4 digits) ⇄ symbolic (rwxr-xr-x, or rwsr-xr-t with special bits). Returns the chmod command, per-owner (user/group/other) permission table, special-bit flags, and a plain-English explanation.

Full parameter reference: /api endpoint.

Privacy-first: values are computed in-memory at the edge and never logged or stored.

Full browser tool

Interactive checkboxes version: chmod Calculator on formatho.com.

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