Each permission digit is the sum of read (4), write (2) and execute (1) for the owner, group and everyone else. The calculator converts between checkboxes, octal numbers and symbolic strings and writes the chmod command. Tick permissions or type 755 / rwxr-xr-x to get the chmod command for Linux and hosting servers.
What does this tool do?
Translates between chmod numbers (755), symbolic notation (rwxr-xr-x) and checkboxes — click permissions and see all three forms instantly, with plain-English explanations of what each setting allows.
Because everything runs locally, the Chmod Calculator doubles as a safe place for sensitive material — API keys, private configs, client data. Nothing is transmitted, logged or cached server-side, which is why teams under NDAs can use it without a second thought.
The controls are straightforward: the inputs are “Numeric (octal)” and “Symbolic”; “644” runs the tool; “755” runs the tool; “600” runs the tool. Results update live as you work — there is no waiting and nothing to submit.
How do I use this tool?
Paste your input, adjust any options, and copy the result — the whole workflow is paste, glance, copy, with no waiting in between.
- Enter your values in “Numeric (octal)”, “Symbolic”.
- Results update instantly as you type — no button to press.
How does it work?
Each permission bit maps to a value (r=4, w=2, x=1) per class (owner/group/other); the octal number is the three sums concatenated. The tool converts both directions and explains the security implications of common settings.
Parsing is strict where it matters (formats with specs) and lenient where it helps (whitespace, line endings). Errors are reported at the exact position with a plain explanation, because a tool that just says “invalid” teaches nothing.
Use cases in Pakistan
WordPress site owners fix “permission denied” upload errors (folders 755, files 644), developers deploy to shared hosting via FTP, and students in Linux courses finally memorise what 777 actually means (everything, everyone — rarely what you want).
From Lahore’s software houses to freelance developers working with Gulf and Western clients, these small utilities punctuate every workday: checking a payload, generating a key, converting a format. They are the screwdrivers of the trade — unglamorous, indispensable, and used dozens of times daily.
Limitations
It computes notation, not server state — it cannot see or change your actual files. Shared hosts sometimes override with their own policies; and 777 is a security risk, not a fix.
Edge cases in specifications can surprise: when a result looks wrong, check the spec’s fine print (or the tool’s stated conventions) before blaming the tool. For production-critical work, verify against your own toolchain as well.
Frequently asked questions
What permissions for WordPress?
Folders 755, files 644. wp-config.php can be 600 for extra safety. Never 777 on a live site. When something looks wrong, test with the simplest possible input first — isolating the problem beats staring at a large payload.
What does 755 mean?
Owner: read+write+execute (7); group and others: read+execute (5). Standard for web folders. Keep the original input saved somewhere; transformations are one-way streets and re-running from scratch is easier than undoing.
Why 777 is dangerous?
Everyone can read, write and execute — any compromised script on the server can modify your files. For production use, verify the output in your actual toolchain once — the browser and your server should agree, and it is worth confirming.
Symbolic vs octal?
Same permissions, different notation: rwxr-xr-x = 755. Use whichever your host’s panel expects. When something looks wrong, test with the simplest possible input first — isolating the problem beats staring at a large payload.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — what you type or paste never leaves your device, is never sent to a server, and is never stored. Closing the tab removes all trace. Keep the original input saved somewhere; transformations are one-way streets and re-running from scratch is easier than undoing.
Is it really free? Do I need an account?
Yes, free, and no account needed. Open the page and use it — no sign-up, no trial, no watermark on results. For production use, verify the output in your actual toolchain once — the browser and your server should agree, and it is worth confirming.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested