ASCII Code Translator

Leave text on the left to obtain decimal values, or swap the main boxes to decode a sequence of decimal numbers. Keep each value separated with a space or comma. The text Hi becomes 72 105: uppercase H and lowercase i have different codes. A run such as 72105 is not automatically split into those two numbers because several other splits would be possible. Start with a small known word and compare its codes before processing a longer passage. That gives you a clear check on the direction and the chosen base.

The ASCII Code Translator does not guess token boundaries or silently accept a decimal value outside the ASCII range.

Decimal 65, hexadecimal 41, octal 101 and binary 1000001 all describe the same ASCII character A. Changing the base changes the way its number is written, not the alphabet or the meaning of the character. Select the base in the workbench before pasting numbers. Its binary output uses seven digits because ASCII is a seven-bit set; the main two-box converter continues to use decimal. A valid binary string can therefore have a different interpretation if you accidentally leave the base on decimal.

Use the independent ASCII Code Translator workbench when a worksheet or log explicitly says hex, octal or binary.

A space has value 32, horizontal tab has value 9, line feed has value 10 and carriage return has value 13. They can change layout without drawing a visible letter. Use the numeric lookup to inspect a value and its label. A Windows-style line ending normally contains carriage return followed by line feed, while other text may contain line feed alone. If a decoded message appears to have an unexpected blank line, inspect its numeric sequence instead of deleting characters blindly. Copying between applications can also normalize line endings.

The ASCII Code Translator returns the corresponding text characters, so an output made only of controls may look blank in a normal text box.

Characters such as é, a curly quotation mark or an emoji do not belong to seven-bit ASCII. This tool rejects them instead of removing the accent, substituting a question mark or taking the low byte of a larger value. An extended eight-bit code page is also a separate choice: different code pages can assign different characters to values above 127. For modern multilingual text, use a Unicode-aware workflow such as the UTF-8 hexadecimal tool linked below. Do not call a successful byte conversion an ASCII conversion unless the values really stay within this set.

The ASCII Code Translator boundary is intentional: it prevents an encoding mismatch from being disguised as a successful result.

Try a short passage containing both A and a, a number, a space and punctuation. The uppercase and lowercase codes should differ while the space remains a separate 32. Reverse the decimal output and compare the result with the original. In the workbench, repeat that check in another base. When an error identifies a token, check its digits and range before changing surrounding values. A minus sign, a decimal point and letters in a decimal field are invalid, rather than instructions to evaluate an expression.

The main ASCII Code Translator accepts up to 500 source text units and up to 2,500 numeric input units after swapping.

When sharing numeric text, state the base, character set and separator with it. For example, label a sequence decimal ASCII with space-separated values, rather than just calling it numbers. Keep a copy of the original numeric sequence, especially when control characters are involved. Character codes are a representation of text, not a method for protecting a secret. Someone who knows the chosen convention can reverse the result directly. For a puzzle, the interesting work may be discovering that convention; for a data file, the convention should be documented.

The ASCII Code Translator helps make that representation explicit, but it does not encrypt a file or identify an unknown file encoding automatically.