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Best Free Online Tools for Writers

Tighten your prose without uploading your draft anywhere. Count words and characters, check Flesch and Gunning Fog readability, find passive voice, adverbs, cliches and filler words, convert case, and estimate reading and speaking time. Every tool runs locally in your browser, so your unpublished work stays private. All 70 tools below are free, run in your browser, and need no sign-up.

JSON Formatter & ValidatorBeautify, minify and validate JSON instantly in your browser. No data leaves your device.Word & Character CounterCount words, characters, sentences, paragraphs and reading time as you type. 100% private.Case ConverterConvert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case and more instantly.Word Frequency CounterPaste text and see which words appear most often, ranked by count, with optional stop-word filtering. Fully private.Remove Duplicate LinesDelete repeated lines, keep unique lines only, with optional case-insensitive and trim matching. Private.Sort LinesSort text lines alphabetically or numerically, ascending or descending, with reverse and shuffle options. Runs privately in browser.Reverse TextFlip text backwards by characters, words or lines instantly. Create mirror-style strings and reversed messages, fully private.Find and ReplaceReplace all occurrences of a word or pattern in text, with case-insensitive and regex options. Bulk edit text privately.Whitespace and Trim RemoverTrim leading and trailing spaces, collapse extra spaces, and strip blank lines from text in one click. Clean text privately.Remove Line BreaksJoin broken lines into one paragraph or replace newlines with spaces or commas instantly. Runs in your browser.Add Line NumbersNumber every line with custom start, separator and zero padding. Great for code, lists and logs. Fully private.Text RepeaterRepeat any word, sentence or block of text as many times as you want, with a custom separator between copies. Runs privately.Lorem Ipsum GeneratorCreate placeholder text by paragraphs, sentences or words for mockups and layouts, with a classic or random start. Private.Slug GeneratorTurn any title into a clean, lowercase, hyphenated slug for SEO-friendly URLs. Handles accents and symbols. Runs privately.camelCase, snake_case and kebab ConverterConvert identifiers between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case for programming. Private.Fancy Unicode Text GeneratorTurn plain text into cursive, bold, italic, monospace, bubble and other Unicode styles for social media bios and posts. Private.Upside-Down Text GeneratorFlip your text so it reads inverted and reversed for fun social posts, usernames and messages. Copy and paste, private.Zalgo and Glitch Text GeneratorAdd creepy, distorted combining marks to text at adjustable intensity for spooky posts and usernames. Copy and paste.Bold Unicode Text GeneratorMake bold, bold italic and sans-serif bold text that pastes into Instagram, LinkedIn and Twitter. Private.Markdown to HTML ConverterTurn Markdown into clean HTML with a live preview. Supports headings, lists, links, bold, code and more. Runs privately.Markdown Table GeneratorEnter rows and columns, edit cells in a grid, and get clean aligned Markdown table syntax to paste into docs. Private.Palindrome and Anagram CheckerTest if a word or phrase is a palindrome, and check whether two texts are anagrams of each other. Runs privately.Text to ASCII Art GeneratorTurn words into big figlet-style banner text made of characters for terminals, README files and comments. Private.NATO Phonetic Alphabet ConverterSpell out any text as Alpha Bravo Charlie for clear communication over phone and radio. Reverse decode too. Private.Text to HandwritingTurn typed text into a handwritten-style note on lined paper and download it as a PNG image. Adjustable ink and size. Private.Character and Special Symbol PickerBrowse and copy arrows, currency, math, stars, punctuation, emoji-style and other Unicode symbols with one click. Private.Text to BinaryTurn any words into 8-bit binary code, with a space between each byte for readability. Encode messages privately in browser.ROT13 Encoder and DecoderShift letters 13 places to hide or reveal text. ROT13 is its own inverse, so one button both encodes and decodes. Private.Caesar CipherEncrypt or decrypt text by shifting letters a chosen number of places. Adjustable shift from 1 to 25 with instant preview. Private.Morse Code TranslatorConvert text to Morse code and Morse back to text, with support for letters, numbers and common punctuation. Runs in your browser.Duplicate Word RemoverDelete repeated words from text and keep only the first occurrence of each, with optional case-insensitive matching. Private.Text Statistics and ReadabilityGet word and sentence counts, average word length, reading time and a readability score for any passage. Fully private in browser.Random Paragraph GeneratorProduce readable random English paragraphs for testing layouts, writing prompts and placeholder content. Runs privately.Title Case ConverterCapitalize headlines correctly by keeping minor words like a, an, the and of lowercase unless they start or end the title. Private.Sentence Case ConverterFix text that is in all caps or random casing by capitalizing the first letter of each sentence and lowercasing the rest. Private.Strikethrough Text GeneratorAdd a line through your text using Unicode so it stays struck through when pasted into chats, bios and posts. Copy and paste.Small Caps Text GeneratorTurn lowercase letters into small capital Unicode characters for stylish bios, headings and posts. Copy and paste anywhere.Line CounterCount total lines, non-empty lines, blank lines and words in any text or code as you type. Live results, fully private in browser.Remove Emojis from TextStrip emoji, pictographs, symbols and hidden variation selectors instantly, leaving clean plain text. Runs in your browser.Extract Email AddressesPull every email out of pasted content, dedupe and list one per line with a count. Fully private in your browser.Extract URLs from TextPull every http and https link out of pasted content, dedupe and list one per line with a count. Private in your browser.Extract Numbers from TextPull every number out of pasted content, list one per line, and see the total sum and count instantly. Runs in your browser.Sentence CounterCount sentences, words and characters in any text as you type, with live results. Fully private and processed in your browser.Pig Latin TranslatorConvert English text to Pig Latin instantly, moving leading consonants to the end and adding ay or way. Live and private in your browser.Leetspeak ConverterTurn text into 1337 5p34k by swapping letters for numbers and symbols, or decode it back to plain text. Live and private in your browser.Mirror Text GeneratorReverse the characters in your text to create mirrored, backwards strings, per line or all at once. Live and private in your browser.Remove Extra SpacesCollapse repeated spaces and tabs to a single space and trim each line for clean, tidy text. Runs in your browser.Reverse Word OrderFlip a sentence back to front while keeping each word intact, per line or all at once. Private in your browser.Readability Score CalculatorGet the Flesch Reading Ease score and grade level for any text instantly in your browser, no sign up.Flesch-Kincaid Grade Level CalculatorFind the US school grade needed to read your text, computed instantly in your browser.Gunning Fog Index CalculatorMeasure text complexity by grade level using sentence length and complex words, all in your browser.SMOG Index CalculatorEstimate reading grade from polysyllable counts, the standard for health and medical readability, in your browser.Coleman-Liau Index CalculatorGet a US grade level from letters and sentences per hundred words, no syllable counting, in your browser.Automated Readability Index CalculatorGet a US grade level from characters, words and sentences instantly in your browser.Passive Voice DetectorFind passive sentences and get the passive share of your text instantly in your browser, no upload needed.Adverb CounterHighlight -ly adverbs and see what share of your writing they make up, computed instantly in your browser.Filler Word FinderSpot padding words like just, really, very and actually so you can cut them, all in your browser.Cliche FinderDetect tired phrases like at the end of the day and think outside the box so you can freshen up your writing.Weasel Word FinderCatch vague qualifiers like some, many, arguably and reportedly that weaken claims, all in your browser.Sentence Length AnalyzerSee average, longest and shortest sentence lengths and flag overly long sentences, all in your browser.Average Word Length CalculatorMeasure mean characters per word and syllables per word to gauge how dense your writing is.Syllable CounterCount syllables in a word, phrase or full text using an English heuristic, computed instantly in your browser.Lexical Diversity CalculatorMeasure vocabulary richness with the type token ratio and root TTR instantly in your browser.Longest Words FinderRank the longest words in your text by character count so you can simplify dense vocabulary, in your browser.Unique Word CounterCount distinct words versus total and see your repetition rate instantly in your browser, no upload needed.Repeated Word FinderDetect words you overuse and catch adjacent duplicate words in your writing, all in your browser.Dialogue Percentage CalculatorMeasure how much of your story is spoken dialogue versus narration, computed in your browser.Text Complexity AnalyzerCombine multiple readability formulas into one consensus grade and complexity snapshot, in your browser.Speaking Time CalculatorEstimate how long your speech or script takes to read aloud at your chosen pace, computed in your browser.Transition Word CounterMeasure how many sentences use transition words like however and therefore to improve flow, in your browser.

Frequently asked questions

Are these tools free?

Yes. Every tool in this toolkit is completely free, with no sign-up and no usage limits.

Do these tools work on mobile?

Yes. They run in any modern web browser on phone, tablet or desktop, with nothing to install.

Is my data private?

Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.

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