Remove Combining Characters
Strip combining diacritic marks from Unicode text to get plain base characters
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About Remove Combining Characters
Strip Combining Characters and Clean Up Your Unicode Text
Unicode combining characters are invisible modifiers that attach to the preceding base character to alter its appearance - adding accents, diacritical marks, overlines, underlines, enclosing shapes, and other decorations. While essential for legitimate multilingual text, combining characters are also the mechanism behind Zalgo text, homoglyph attacks, and a variety of text processing headaches. The Remove Combining Characters tool strips all of them cleanly, leaving you with pure base characters.
What Are Combining Characters Exactly?
In Unicode, a combining character is a code point that does not stand alone but instead modifies the character that precedes it. The combining acute accent (U+0301) placed after the letter "e" (U+0065) produces an accented e. The combining tilde (U+0303) after "n" produces the Spanish letter enye. There are hundreds of combining characters in Unicode, spanning diacritical marks, mathematical notation, musical symbols, and various scripts from around the world.
The problem arises when combining characters are stacked excessively or used outside their intended linguistic context. Zalgo text - that creepy, glitchy-looking text that extends vertically with stacked diacritical marks - is created by piling dozens of combining characters onto each base character. The text becomes visually chaotic, breaks layout in UI components, and can cause performance issues in rendering engines that were not designed to handle hundreds of stacked marks.
Why You Would Want to Remove Combining Characters
Cleaning user-generated content. If your platform accepts text input from users - comments, usernames, forum posts, chat messages - you will inevitably encounter Zalgo text, excessively decorated text, or text with injected combining characters meant to bypass content filters. Stripping combining characters is a fast and effective sanitization step that neutralizes these issues without altering the base content.
Text normalization for search and comparison. When comparing strings, combining characters create subtle mismatches. The letter "e" with a separately encoded combining acute accent is visually identical to the precomposed character "e-acute" (U+00E9), but they are different byte sequences. Removing combining characters and working with decomposed base characters eliminates this ambiguity. It is a common preprocessing step in search indexing, deduplication, and fuzzy matching.
Data cleaning for analysis. Datasets scraped from the web or imported from heterogeneous sources often contain inconsistent combining character usage. One record might use precomposed characters while another uses base characters with combining marks. Stripping the combining marks and working with base characters only produces a uniform dataset that analyzes correctly.
Accessibility improvements. Screen readers and assistive technologies sometimes struggle with heavily decorated Unicode text. Removing unnecessary combining characters improves the experience for users relying on these tools.
How the Removal Process Works
The tool applies a Unicode-aware filter that identifies characters in the Combining Diacritical Marks block (U+0300 to U+036F), the Combining Diacritical Marks Extended block, the Combining Diacritical Marks Supplement block, and other combining character ranges. Every code point classified as a combining character by the Unicode standard is removed from the text, while all base characters, punctuation, digits, and spacing characters are preserved untouched.
The result is text that reads normally but lacks any diacritical modifications. For languages that require diacritical marks - French, Spanish, Vietnamese, and many others - this means accented characters lose their accents. That is the correct behavior when your goal is stripping combining marks; if you need to preserve linguistically meaningful accents, you should first normalize to precomposed form (NFC) which merges base characters and combining marks into single code points that survive the stripping process.
Fast, Private, Browser-Based
Paste your text, click remove, and get clean output. The Remove Combining Characters tool processes everything in your browser - no text is sent to any server, no data is stored. Whether you are sanitizing a user submission, cleaning a dataset, or just de-Zalgo-ifying a meme, the tool handles it instantly and privately.