Truncate ASCII Data Keep only the first N ASCII characters and discard everything after that limit.
Use it for previews, fixed-size examples, simple test fixtures, or code that needs a predictable maximum text length.
Start with the built-in sample, then replace it with a short test value containing a space, punctuation, and a character whose code you already know. This gives you a quick sanity check before using a longer string.
Truncation is not summarization and does not add an ellipsis. The output is simply the original prefix up to the requested length.
Test zero, an exact-length limit, and a limit larger than the input. The result stays in the browser until you explicitly copy or download it.
This tool does not require an account, upload service, or external API. That makes it suitable for development checks, retro-computing exercises, documentation examples, and small repeatable test fixtures.
Truncation is useful when you need a predictable maximum number of characters rather than a semantic summary. The tool keeps the prefix of the string and removes everything after the selected limit. It does not add punctuation, infer word boundaries, or try to make the result read naturally, which keeps the operation deterministic.
Because truncation works by character position, spaces and punctuation count just like letters and digits. This is important when the string is going into a fixed-width test or an interface that expects an exact maximum length. If your requirement is a byte limit or a word limit, a different rule is needed.
Try three boundary cases when testing an application: a limit of zero, a limit equal to the input length, and a limit larger than the input. These cases make it obvious whether the implementation is behaving as a true truncation function rather than accidentally adding or removing extra characters.
For user interfaces, truncation can be appropriate for short previews, but avoid presenting a truncated value as though it were the complete original. Keep the original input available when the context requires full fidelity. This tool intentionally gives you the raw prefix and leaves presentation decisions to the surrounding application.
If truncation is part of an application contract, document whether the limit counts characters, bytes, or another unit. This tool counts ASCII characters, which is equivalent to one byte per supported character, but that assumption should not be carried automatically into a Unicode system. A clear unit definition prevents off-by-one and multibyte encoding mistakes when the rule is implemented elsewhere.