About the Base64 to Octal Converter
Octal groups bits in threes, which makes it a natural fit for anything built around nine bit or twelve bit words, for Unix file modes, and for the string escapes that C, Python and the shell have used since the 1970s. A byte always fits in three octal digits, from 000 up to 377.
Three output styles cover the places these values usually end up. Plain triplets suit a table or a report. Backslash escapes produce \110\151, which pastes straight into a C string literal or a printf argument. The 0o style matches modern Python and JavaScript numeric literals. Every value is padded to three digits so columns line up and nothing is ambiguous when the separator is set to nothing.
The decoder accepts a data: prefix, ignores whitespace inside the Base64, repairs missing padding and understands the URL-safe alphabet, so a token segment converts without cleanup. Values are produced from the raw bytes, which means the tool works on compressed data and images as happily as on text.
Reading a Unix permission mask rather than a payload? Unix Permission Calculator is the better fit. To rebuild Base64 from octal, use Octal to Base64.
How to use
- Paste the Base64 string into the input pane.
- Choose a Value style: plain triplets, backslash escapes or 0o literals.
- Pick the separator that matches your destination, then copy the values.
Common questions
- Why are all values three digits long?
- The largest byte is 255, which is 377 in octal, so three digits covers every possible value and keeps the columns aligned.
- Can I paste the escapes straight into C?
- Yes. Choose the backslash style and set the separator to nothing, and the result is a valid octal escape sequence inside a string literal.
- Is octal still used anywhere?
- Mostly in Unix file modes, in legacy string escapes and in some embedded toolchains. Hexadecimal has replaced it nearly everywhere else.
- What does the byte count tell me?
- It is the number of octal triplets produced, which is a quick check that the Base64 decoded to the payload size you expected.