Free online tool
Whitespace Cleaner
Remove stray spaces, tabs and empty lines from any block of text.
Why clean whitespace?
Text copied from PDFs, chat threads, or scraped web pages is often riddled with double spaces, stray tabs, and blank lines that break formatting when pasted into a document or a form field. Cleaning it manually with find-and-replace works but is tedious. This tool handles all three common problems in one pass.
What the options do
"Trim each line" removes leading and trailing spaces. "Collapse repeated spaces" reduces any run of spaces or tabs to a single space. "Remove blank lines" drops lines that are empty after trimming. Toggle each independently to keep the intentional formatting you want.
+Does it preserve line breaks inside code?
Yes. Only whitespace within a line and empty lines are touched — real line breaks between content are preserved.
+Can I use this on markdown?
Yes, but be careful: markdown sometimes uses trailing double spaces for line breaks. Disable line trimming if you rely on that.
Fixing the invisible formatting problems that break other tools
Text copied from a PDF, an email client, or a scanned document brings hidden baggage: double spaces after periods from old typewriter conventions, tabs mixed with spaces, and trailing blank lines that push a footer three scrolls further down than it should be.
None of these problems are visible in a normal reading view, which is exactly what makes them frustrating — a document can look perfectly clean on screen while still failing an exact string match, breaking a CSV import, or producing a diff full of false positives, all because of characters nobody can actually see.
Why this breaks more than it looks like
A CSV field with trailing whitespace will fail an exact-match lookup in a spreadsheet formula even though the cell looks empty and correct on screen, and the same hidden characters cause line-based tools like deduplication or diffing to treat identical-looking lines as different.
Search-and-replace operations in a code editor or CMS can also silently fail against text pasted from a rich text source, because a 'space' typed on a smart-formatting word processor is sometimes actually a non-breaking space (Unicode U+00A0), a completely different character to a plain-text search even though it renders identically.
What gets normalized
Collapsing multiple consecutive spaces into one, stripping leading and trailing whitespace from every line, and reducing three or more blank lines down to a single paragraph break are the three fixes that solve the majority of copy-paste formatting complaints, particularly when moving content from a word processor into a plain-text CMS field or markdown file.
Tabs versus spaces in shared documents
Mixing tabs and spaces for indentation in anything meant to be shared as plain text — a code snippet, a config file, an ASCII table pasted into a chat — causes alignment to break the moment it's viewed in an editor with a different tab width, and normalizing to one or the other before sharing avoids the classic 'it looks fine on my machine' complaint.
A pre-publish habit for CMS platforms
Many content management systems store extra whitespace exactly as pasted, and it shows up later as unexpected gaps between paragraphs on the live page or as an SEO-unfriendly excerpt that starts with blank space instead of the first sentence — running a draft through a whitespace cleaner right before publishing catches this in seconds instead of after a reader reports it.
Cleaning up before a bulk find-and-replace
Running a whitespace cleanup before doing a bulk find-and-replace across a large document avoids a frustrating failure mode where a search phrase doesn't match because of an extra space or a stray tab hiding in the middle of it — normalizing first means the visible text and the actual underlying string finally agree with each other.
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