Slice ASCII Data Extract a selected range from ASCII text using zero-based start and exclusive end indexes.
Use it for parser exercises, fixed-position records, substring checks, and quick extraction tasks.
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.
The end index is exclusive, matching common programming-language slice semantics. A range beyond the available length simply ends at the available characters.
Try the alphabet sample with ranges 0–3, 2–5, and equal start/end values. 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.
Slicing is different from truncation because it lets you choose both where the extracted range begins and where it ends. The tool follows a familiar zero-based, end-exclusive convention, which makes it easier to compare its behavior with common programming languages. A slice from index 2 to 5 therefore contains positions 2, 3, and 4.
Testing equal start and end indexes is useful because it should return an empty result without changing the source. Testing an end beyond the input length is also valuable because the available characters should simply determine where the slice stops. These cases are common in real parsers and are worth checking explicitly.
Spaces are part of the indexed string. If a fixed-position record includes padding, those spaces affect the indexes exactly as visible characters do. That makes the tool useful for inspecting legacy fixed-width examples as well as ordinary programming strings.
The converter leaves the input untouched. This matters when you are experimenting with several ranges: change the indexes and rerun the conversion without rebuilding the source text. The output is a new view of the same ASCII data rather than a destructive edit of the original string.
When you use slicing to inspect structured text, keep the indexing convention documented with the field definition. A field starting at index 10 and ending at 20 contains positions 10 through 19 here. That small detail is easy to overlook when moving between tools or programming languages, and writing it down prevents a large class of off-by-one errors.