ASCII Validator

The ASCII Validator checks a block of text or ASCII art for encoding issues and display problems before you publish or embed it. It scans for characters that fall outside the standard 7-bit ASCII range, flags invisible or problematic glyphs such as non-breaking spaces, zero-width characters, and smart quotes, and identifies inconsistent line endings that can break rendering in different environments. The goal is to confirm that what you see will look the same on someone else's terminal, code editor, or web page.

Many display failures come from characters that look harmless but are not true ASCII: curly typographic quotes pasted from a word processor, em dashes, accented letters, or box-drawing characters that only render with specific fonts. The validator surfaces these so you can decide whether to keep them intentionally or replace them with safe equivalents. It also catches mixed CRLF and LF line endings, which can cause art to appear doubled-spaced or jumbled across operating systems.

This is especially valuable for ASCII art destined for places with strict character requirements, such as source-code comments, commit messages, plain-text email, configuration banners, or systems that assume single-byte encoding. Developers use it to keep generated art portable, while writers use it to ensure copied text contains no hidden Unicode surprises. Running validation as a final step prevents the frustrating situation where art looks perfect locally but breaks for everyone else.

When the validator reports issues, the typical fix is to run the text through an ASCII Text Cleaner to strip or substitute the offending characters and normalize line endings. After cleaning, re-validate to confirm a clean pass. For art-specific work, you can combine validation with an ASCII Art Analyzer to verify both the encoding is safe and the visual density and structure are as intended.