# Chmod calculator — symbolic ⇄ octal, no upload

> Convert file permissions between symbolic (rwx) and octal (755) with a chmod calculator, in your browser. Nothing is uploaded.

Toggle read/write/execute for owner, group, and others to get the octal chmod value — or enter an octal like 755 to see the permissions it grants. The calculation is pure local math, with nothing uploaded.

Unix permissions trip people up because they mix symbolic and octal forms. A calculator lets you toggle the bits visually and read off the exact octal, or decode a number you've been given.

For scheduling scripts, see the cron explainer; for containerizing them, the Dockerfile generator.

## How to

1. **Set permissions.** Toggle rwx for owner, group, and others, or type an octal.
2. **Read the value.** See the octal and symbolic representation.
3. **Copy the command.** Copy the chmod command you need.

## FAQ

### What does chmod 755 mean?

Owner can read/write/execute (7), group and others can read/execute (5) — a common setting for scripts and directories. The calculator shows the breakdown.

### What's the difference between 644 and 755?

644 is read/write for owner and read for others (typical for files); 755 adds execute (typical for scripts and directories). The tool makes the distinction clear.

### Is anything uploaded?

No. The calculation is local math in the tab.


## Related tools

- [Cron explainer](https://www.safepaper.app/dev/cron)
- [Dockerfile](https://www.safepaper.app/dev/dockerfile-gen)
- [Common ports](https://www.safepaper.app/dev/common-ports)
- [Number base](https://www.safepaper.app/dev/number-base)

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Canonical HTML: https://www.safepaper.app/dev/chmod
Markdown: https://www.safepaper.app/dev/chmod.md

There is no upload endpoint — your files are processed in this browser tab. Open your network tab and check.