Whitespace Formatter Tool

The whitespace formatter cleans blocks of text or code by trimming leading and trailing whitespace, collapsing repeated blank lines, and normalizing headings, bullets, colon spacing, and line endings. Pasted or typed text carries statistics on removed spaces, inserted lines, and character and word changes, plus visual aids for confirming what each transformation did.

• Transformations apply individually: trim, collapse blank lines, normalize bullets, fix colon spacing, and standardize headings can each be switched on or left alone.
• A "Preserve vs Cleaned" view compares the original text against the formatted result side by side.
• Line endings unify to one of four styles: Original, Unix (\n), Windows (\r\n), or Mac (\r).
• Statistics update in real time: characters, words, spaces removed, and lines inserted.
• A non-printable character view reveals \n and \t markers directly, so hidden whitespace is visible rather than inferred.
• A difference view highlights edited words, confirming the exact scope of a change before it is accepted.
• Undo and redo step back and forward through the formatting history without losing prior states.

The rule behind each option determines the output exactly, which keeps results repeatable across runs:

• Trim leading/trailing whitespace: spaces at the start and end of each line are removed, matching the pattern ^\s+|\s+$ applied per line.
• Collapse multiple blank lines: three or more consecutive newlines convert to exactly two; when a line and the line before it are both blank, the later one drops.
• Consistent heading breaks: a blank line inserts before a numbered heading whenever the previous line is not already blank and the current line matches ^[IVXLC]+\.\s.
• Add colons to headings: a heading ending without a colon gets one appended; a line matching ^[IVXLC]+\.\s[^:]+$ has its trailing period replaced with a colon.
• Normalize bullet spacing: a blank line precedes each list, and duplicate blank lines inside a list are removed, matching the bullet pattern ^\s*[-*]\s.
• Preserve code and structured blocks: fenced code (``` and ~~~), <pre>, <script>, and <style> blocks, YAML front matter (---), and MDX ::: notes hold behind placeholders during formatting and restore afterward, so their internal whitespace survives untouched.
• Space after colons: a colon directly followed by a non-space character gets a single space inserted, replacing :(\S) with : $1.
• Remove trailing spaces: spaces or tabs at the end of a line strip out, matching [ \t]+$ in multiline mode.
• Retain indentation: leading indentation stays intact so code blocks and nested lists keep their structure.
• Capitalize section headers: a line's first character uppercases when it starts with a letter, producing consistent headings.
• Remove emojis and symbols: common symbols and emoji ranges delete while punctuation and words stay intact.
• Line ending normalization: lines rejoin with the selected newline: Unix \n, Windows \r\n, or Mac \r.
• Difference detection: the original and cleaned text split into tokens, and tokens that changed position or content highlight.

The whitespace formatter applies to pasted text that needs quick cleanup, document standardization, and content preparation for publishing, collaboration, import, or analysis.

• Text pasted from email, PDFs, and web pages typically carries odd spacing, stray tabs, and duplicated blank lines, all removed in one pass.
• Documentation, knowledge base articles, and CMS content read cleaner with consistent headings, bullets, and colon spacing enforced throughout.
• Developer notes, README files, and Markdown content normalize without disturbing fenced code blocks or front matter.
• CSV or TSV descriptions and JSON-adjacent text prepare for ingestion with indentation kept intact and trailing spaces stripped.
• Unified line endings across a set of files prevent the cross-platform diffs that make Git history and code review noisy.
• Product descriptions, policy pages, and legal text gain a uniform style, aiding clarity, search indexing, and internal compliance.
• NLP and analytics pipelines run on cleaner input once noise is removed, whitespace is controlled, and token boundaries turn consistent.
• Meeting notes and outlines become easier to share once list structure normalizes and spacing turns legible.
• Prompt libraries and snippet collections stay clean for reuse, with code and structured regions preserved exactly as written.
• Non-printable visualization and highlight-only diffs make formatting issues visible, confirming the exact scope of an edit.