Free Online Text Tools

Clean lists, inspect Unicode, compare text and prepare Markdown, study cards and subtitles with free online text tools.

Choose the right tool

Choose line-based tools for lists and reference numbers, word-based tools for prose, and extractors for visible patterns. Compare Text preserves occurrence differences; Remove Duplicate Lines keeps first occurrences.

Available tools

• Duplicate Line Finder

  Find duplicate lines in text, see occurrence counts and line numbers, and copy a cleaned list. Choose case and whitespace options.

• Compare Text Online

  Compare two texts by line position or find values present in only one list. Extra duplicate occurrences are included in the comparison.

• Remove Empty Lines

  Remove blank lines from pasted text. Optionally remove lines containing only whitespace while keeping the remaining lines in order.

• Sort Lines Online

  Sort text lines A–Z or Z–A, use natural number ordering, trim whitespace and optionally remove duplicate values.

• Word Counter

  Count words, Unicode characters, total lines and non-empty lines in pasted text. See counts with and without whitespace.

• Change Text Case

  Convert text to uppercase, lowercase, title case or sentence case. Paste text, choose the conversion and copy the result.

• Extract Email Addresses from Text

  Extract common email address formats from pasted text, remove duplicates and optionally sort the results alphabetically.

• Find and Replace Text

  Replace text or regular-expression matches in your browser. Supports case-insensitive searches, multiline regex anchors and literal replacement text.

• Remove Duplicate Lines

  Keep the first occurrence of each line, preserving order.

• Extract Lines That Occur Only Once

  Keep only lines that appear exactly once.

• Trim Whitespace

  Trim leading and trailing whitespace from every line.

• Remove Extra Spaces

  Collapse repeated horizontal whitespace without joining lines.

• Add Line Numbers

  Number each line with a starting number and separator.

• Add Prefix / Suffix to Lines

  Wrap each line with your chosen prefix and suffix.

• Reverse Text or Line Order

  Reverse line order or Unicode characters.

• Shuffle Lines

  Randomize line order using browser cryptographic randomness.

• Join / Split Lines

  Join lines or split text using a literal delimiter.

• Filter Lines by Keyword

  Keep or exclude lines containing a literal keyword.

• Extract URLs from Text

  Extract HTTP and HTTPS links from pasted text.

• Extract Numbers from Text

  Extract signed integers and decimal numbers.

• Remove HTML Tags

  Extract readable text and decode entities without running scripts.

• Remove Accents from Text

  Remove combining accent marks using Unicode normalization.

• Text to URL Slug

  Create lowercase, hyphen-separated slugs from Unicode text.

• Count Word Frequency

  Count Unicode words and sort them by frequency.

• Find Most Common Phrases

  Count repeated sequences of words.

• Text Readability Calculator

  Estimate English Flesch reading ease and grade level; syllables are approximate.

• Word Wrap Text

  Wrap text at a chosen width without splitting long words.

• Unwrap Text Paragraphs

  Join wrapped lines within each paragraph while preserving blank paragraph breaks.

• Split Text into Chunks

  Split text into numbered Unicode-character chunks.

• Extract Hashtags

  Extract Unicode letter/number hashtags, keeping the first spelling.

• Extract Social Mentions

  Extract ASCII @handles from text; exclude handles inside email addresses.

• Extract Text Between Delimiters

  Extract non-overlapping text between literal opening and closing delimiters.

• Show Invisible Whitespace

  Make spaces, tabs and line endings visible without changing the source.

• Unicode Normalization

  Normalize text using NFC, NFD, NFKC or NFKD.

• Line Frequency Counter

  Count every distinct line, including lines that occur once.

• List Intersection

  Keep unique values present in both lists, in first-list order.

• List Union

  Combine two lists and keep the first occurrence of each value.

• Pair Two Lists

  Pair corresponding lines from two equally sized lists.

• Split Paired Lines

  Split each line at the first literal delimiter into two JSON arrays.

• Extract Markdown Links

  Extract simple inline Markdown links into a label/URL JSON report.

• Truncate Text

  Limit text to a total Unicode-character length, including a chosen suffix.

• Pad Text Lines

  Pad each line to a minimum Unicode-character width.

• Redact Literal Phrases

  Mask exact phrases you specify; this does not automatically detect all sensitive data.

• Character Frequency Counter

  Count Unicode code points and display their frequency.

• Sentence Splitter

  Split text into sentence-like segments using punctuation boundaries.

• Paragraph Analyzer

  Report paragraph lengths and word counts.

• Longest Line Finder

  Rank lines by Unicode-character length.

• Word Length Distribution

  Count words by Unicode-character length.

• Word Position Finder

  Locate exact word tokens and their zero-based UTF-16 offsets.

• Text Concordance Viewer

  Show context around literal matches.

• Anagram Checker

  Compare letter/number multisets after Unicode normalization.

• Palindrome Checker

  Check normalized letter/number text for reversal symmetry.

• Acronym Builder

  Create initials from word tokens.

• Custom Stopword Remover

  Remove exact word tokens supplied in a stopword list.

• Keep Numeric Lines

  Keep lines that consist entirely of a decimal number.

• Line Ending Converter

  Normalize text to LF or CRLF line endings.

• Tab and Space Converter

  Expand tab characters to fixed spaces, or collapse exact space groups.

• Text Indenter

  Add a chosen number of spaces to each line.

• Common Indentation Remover

  Remove the minimum common leading-space indentation.

• Remove List Numbering

  Remove leading numeric list markers while retaining text.

• Bullet List Formatter

  Turn non-empty lines into a consistently marked list.

• Smart Quote Normalizer

  Replace curly quotation marks with plain ASCII quote characters.

• Punctuation Spacing Cleaner

  Normalize spaces around common ASCII punctuation.

• Unicode Text Slicer

  Extract a slice using Unicode code-point positions.

• Word N-gram Generator

  List contiguous word sequences of a specified length.

• Character N-gram Generator

  List contiguous Unicode-character sequences.

• Unique Word Extractor

  List distinct lowercase word tokens in first-occurrence order.

• Repeated Word Finder

  Report tokens occurring more than once.

• Character Entropy Calculator

  Calculate Shannon entropy from Unicode-character frequencies.

• Leetspeak Encoder

  Apply a disclosed basic leetspeak substitution map.

• ROT Cipher Encoder

  Rotate ASCII letters by a selected Caesar shift.

• Morse Code Translator

  Encode ASCII letters/digits as Morse, or decode space-separated Morse tokens.

• Sort Lines by Length

  Order lines by Unicode-character length while preserving ties.

• Interleave Two Lists

  Alternate lines from two lists, retaining any remainder.

• Rotate List Positions

  Move a selected number of leading lines to the end.

• Select Every Nth Line

  Select periodic lines using a one-based starting position.

• Insert a Line at Position

  Insert literal text at a one-based line position.

• Extract Line Range

  Keep an inclusive one-based range of input lines.

• Fixed Column Text Aligner

  Align literal-delimiter-separated text columns with spaces.

• Unicode Character Sum

  Sum Unicode code-point values for a simple diagnostic checksum.

• Whole Word Replacer

  Replace exact Unicode word tokens without substring matches.

• ASCII Compatibility Checker

  Report non-ASCII characters and their code-point positions.

• Control Character Cleaner

  Remove ASCII control characters while retaining tabs and line endings.

• Invisible Format Character Cleaner

  Remove zero-width and Unicode formatting characters.

• Emoji Sequence Extractor

  Extract grapheme clusters containing extended pictographic characters.

• Pictographic Emoji Remover

  Remove whole grapheme clusters containing pictographic emoji.

• Combining Mark Inspector

  Inspect combining marks after canonical decomposition.

• Bidirectional Control Detector

  Locate explicit bidirectional formatting and isolation controls.

• Writing Script Profile

  Count code points by selected Unicode writing scripts.

• Grapheme Cluster Counter

  Compare user-perceived grapheme clusters with code points and UTF-16 units.

• Grapheme Cluster Splitter

  Place each user-perceived grapheme cluster on a separate line.

• UTF-16 Surrogate Pair Inspector

  Report UTF-16 surrogate pairs and unmatched surrogate units.

• Fullwidth ASCII Converter

  Convert ASCII graphic characters to fullwidth forms or back.

• Typographic Fraction Converter

  Replace supported isolated numeric fractions with Unicode fraction symbols.

• Superscript Digit Converter

  Convert digits and basic signs to superscript typography.

• Subscript Digit Converter

  Convert digits and basic signs to subscript typography.

• Scripted Digits to Plain Text

  Normalize superscript and subscript digits to ordinary digits.

• Hashtag Builder

  Turn each phrase into a compact hashtag while retaining Unicode letters and digits.

• Social Mention Masker

  Replace ASCII social handles with stable numbered placeholders.

• Email Display Obfuscator

  Replace @ and dots inside simple email addresses with readable bracketed text.

• Integer to English Words

  Write whole numbers in English using the short scale.

• English Ordinal Number Formatter

  Append the correct English ordinal suffix to integers.

• NATO Phonetic Alphabet Encoder

  Encode ASCII letters as NATO phonetic words, preserving digits.

• NATO Phonetic Alphabet Decoder

  Decode NATO alphabet words, digits and slash-separated spaces.

• Uncontracted Braille Letter Encoder

  Encode basic lowercase ASCII letters as Unicode Braille patterns.

• Braille Letter Cell Decoder

  Decode the supported 26 uncontracted letter patterns.

• Pig Latin Translator

  Apply a simple vowel/consonant English Pig Latin rule.

• Atbash Letter Cipher

  Mirror ASCII letters across the alphabet.

• Rail Fence Cipher

  Encode or decode a bounded zigzag rail-fence transposition.

• Affine Letter Cipher

  Apply or reverse an invertible affine map over ASCII letters.

• Vigenère Cipher Demonstrator

  Encode or decode ASCII letters with a repeating alphabetic key.

• Bacon Cipher Demonstrator

  Encode letters into five-character A/B groups or decode them.

• Cloze Deletion Card Builder

  Create study-card text by hiding literal answer phrases.

• Glossary to Markdown Definitions

  Convert term: definition lines to a Markdown glossary.

• Flashcard TSV Builder

  Turn question | answer pairs into tab-separated study cards.

• Vocabulary Coverage Checker

  Compare text vocabulary with an explicit known-word reference list.

• Word List Length Filter

  Keep list entries whose Unicode-letter token length is within a chosen range.

• Word Prefix Grouper

  Group list entries by their first N Unicode code points.

• Word Suffix Grouper

  Group list entries by their final N Unicode code points.

• Inline Word Sorter

  Alphabetize word tokens and return a space-separated vocabulary.

• Personal Name List Sorter

  Sort names by their last whitespace-delimited component.

• Name Initials Formatter

  Format all leading name components as initials, preserving the last component.

• Remove Consecutive Duplicate Lines

  Collapse only adjacent identical lines while preserving later repetitions.

• Duplicate Paragraph Remover

  Keep the first occurrence of each trimmed blank-line-separated paragraph.

• Paragraph Sorter

  Sort blank-line-separated paragraphs while retaining their internal line breaks.

• Fixed-Size Line Block Sorter

  Sort groups of N lines by each group’s first line.

• Fixed-Size Block Reverser

  Reverse the order of fixed-size line groups, retaining lines inside each group.

• Text Run-Length Encoder

  Represent consecutive Unicode-character runs as JSON pairs.

• Text Run-Length Decoder

  Rebuild text from character/count JSON pairs with an output-size limit.

• Insert Periodic Blank Lines

  Insert an empty separator after every N input lines.

• Balanced List Partitioner

  Divide a list into near-equal contiguous numbered sections.

• Allowed Character Filter

  Keep only characters present in an explicit allow-list.

• Literal Character Set Remover

  Remove every character listed in a literal set.

• Character Map Translator

  Translate characters positionally using two equal-length alphabets.

• Character Position Finder

  List code-point indices for characters in a selected set.

• Bracket Balance Checker

  Check raw round, square and curly bracket pairing with offsets.

• Sentence Length Report

  List sentence-like segments with word counts and long-sentence flags.

• Repeated Sentence Finder

  Report repeated trimmed sentence-like strings.

• Consecutive Repeated Word Checker

  Locate adjacent equal word tokens, ignoring case.

• Vocabulary Diversity Report

  Calculate type-token ratio, once-used words and repeated-token share.

• Vocabulary Overlap Score

  Compare token-set Jaccard and Dice overlap between two texts.

• Levenshtein Distance Calculator

  Compute character insertion, deletion and substitution distance.

• Hamming Distance Calculator

  Count differing positions in equal-length Unicode strings.

• Common Prefix Finder

  Find the longest exact Unicode prefix shared by all input lines.

• Common Suffix Finder

  Find the longest exact suffix shared by all input lines.

• Acrostic and Telestich Extractor

  Read the first or last non-whitespace character of each non-empty line.

• Text Newspaper Column Splitter

  Arrange list items into a chosen number of down-reading text columns.

• Character Matrix Transposer

  Transpose a rectangular Unicode character grid.

• Character Grid Rotator

  Rotate a rectangular character grid 90 degrees clockwise.

• Text Offset to Line and Column

  Map a zero-based UTF-16 offset to a one-based line and column.

• Line and Column to Text Offset

  Map one-based line and UTF-16 column positions to an offset.

• Alternating Line Splitter

  Separate odd-positioned and even-positioned lines into two groups.

• Words Common to Every Line

  Find case-folded word tokens appearing on every non-empty line.

• Markdown Heading Extractor

  Extract ATX Markdown headings with levels and line numbers.

• Markdown Table of Contents Builder

  Build a linked Markdown outline with duplicate-slug suffixes.

• Markdown Checklist Builder

  Convert plain task lines into unchecked Markdown task items.

• Markdown Task Progress Report

  Count checked and unchecked Markdown task-list items.

• Markdown Code Fence Extractor

  Extract backtick fenced code blocks and their language labels.

• Markdown Literal Escaper

  Escape common Markdown punctuation for literal display.

• Markdown Reference Link Extractor

  Extract simple reference-style link definitions into JSON.

• Markdown Image Reference Extractor

  Extract simple inline image alt text, URL and title.

• Markdown Blockquote Formatter

  Prefix every input line with a Markdown blockquote marker.

• Markdown Footnote Definition Builder

  Create sequential Markdown footnote definitions from lines.

• Nested Bullet Indentation Normalizer

  Convert fixed-width leading-space indentation to a new width for bullet lines.

• Hierarchical Outline Numberer

  Number a space-indented outline with hierarchical counters.

• Dotted Leader List Formatter

  Align labels and page numbers using dotted leaders.

• Delimited Text to Accessible HTML List

  Convert label/value lines into an escaped HTML description list.

• Plain List to HTML List

  Generate an escaped ordered or unordered HTML list.

• Subtitle SRT Draft Builder

  Build fixed-duration subtitle cues from one caption per line.

• SRT Subtitle Text Extractor

  Extract caption text from structurally valid SRT cue blocks.

• SRT to WebVTT Converter

  Convert SRT timing separators and add a WEBVTT header.

• Subtitle Caption Length Checker

  Report code-point counts and flag captions above a threshold.

• Literal Text Template Filler

  Replace named placeholders from a JSON string-value dictionary.

• Template Placeholder Audit

  Report placeholder names, occurrence counts and whether each value is supplied.

• Sequential List Renumberer

  Replace existing numeric list labels with a fresh sequence.

• English Pangram Checker

  Check coverage of all 26 English ASCII letters.

• Isogram Word Checker

  Check whether normalized ASCII letters repeat in a phrase.

• Word Letter Pattern Generator

  Map repeated letters in each word to a canonical numeric pattern.

• Anagram Word List Grouper

  Group word-list entries sharing the same normalized letter multiset.

• Identifier Case Style Converter

  Convert one identifier per line to camel, Pascal, snake, kebab or constant style.

• UTF-8 Text Budget Trimmer

  Trim at a grapheme boundary to stay inside a chosen UTF-8 byte budget.