Is my input uploaded?

No. Everything is calculated inside your browser and never leaves your machine.

Can I paste ls -l output that starts with '-' or 'd'?

Yes. A leading file-type character (-rwxr-xr-x, drwxr-xr-x, etc.) is automatically stripped before parsing.

Is it valid to set setuid / setgid without the execute bit?

Yes — it just means the bit is set but the file isn't executable. The symbolic view shows a capital S in that slot (e.g. 4644 → rwSr--r--). The same applies to a standalone sticky bit (1666 → rw-rw-rwT, capital T).

Should I use 3 or 4 octal digits?

Either works. A 3-digit value (e.g. 755) implies a 0 for the special bits, while a 4-digit value (e.g. 4755) makes them explicit. The output always shows 4 digits so the special bits are never hidden.

How do I set 777 or 666 'everyone can write'?

The 777 preset gives you that with one click, but it is risky on a shared machine. For shared directories prefer 1777 (with the sticky bit) so only the file owner can remove files.

Back to Developer

chmod permission calculator — 755 ↔ rwxr-xr-x ↔ checkboxes

Convert Linux / macOS file permissions between octal (755 / 0755 / 4755) and symbolic form (rwxr-xr-x / rwsr-xr-t), or edit them directly with the owner / group / other checkboxes. Supports the setuid / setgid / sticky bits and accepts ls -l output with a leading file-type char (-, d, l, ...). Includes common presets such as 644 (regular file), 755 (directory or executable), 600 (SSH key), and 1777 (shared directory like /tmp). Runs entirely in your browser.

developerconversion

How to use

1. Edit the octal, symbolic, or checkbox view — all three stay in sync, so changing one updates the others instantly. 2. Toggle setuid / setgid / sticky in the "Special bits" section, or include them in a 4-digit octal value (e.g. 4755 / 2755 / 1777). 3. Use a preset button (644 / 755 / 600 / 1777, …) to apply a common pattern in one click. 4. Copy the "chmod command" output and paste it straight into your terminal (e.g. chmod 755 path/to/file).

FAQ

Is my input uploaded?: No. Everything is calculated inside your browser and never leaves your machine.
Can I paste ls -l output that starts with '-' or 'd'?: Yes. A leading file-type character (-rwxr-xr-x, drwxr-xr-x, etc.) is automatically stripped before parsing.
Is it valid to set setuid / setgid without the execute bit?: Yes — it just means the bit is set but the file isn't executable. The symbolic view shows a capital S in that slot (e.g. 4644 → rwSr--r--). The same applies to a standalone sticky bit (1666 → rw-rw-rwT, capital T).
Should I use 3 or 4 octal digits?: Either works. A 3-digit value (e.g. 755) implies a 0 for the special bits, while a 4-digit value (e.g. 4755) makes them explicit. The output always shows 4 digits so the special bits are never hidden.
How do I set 777 or 666 'everyone can write'?: The 777 preset gives you that with one click, but it is risky on a shared machine. For shared directories prefer 1777 (with the sticky bit) so only the file owner can remove files.

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