Online Text Tools

Add Line Numbers

Instantly add line numbers to any block of text. Set the start number, choose a separator style, pad with leading zeros, and skip blank lines. Free online tool — no sign-up needed.

Add Numbers in Text

Calculate the sum of all numbers found in a string of text. Type, paste, or upload and let the tool do the math for you.

Case Converter

Convert text between uppercase, lowercase, title case, sentence case, camelCase, PascalCase, snake_case, kebab-case and more. Free, instant, no sign-up required.

Find and Replace Text

Find and replace text online instantly. Supports plain text and regular expressions. Shows match count before replacing. No sign-up required — runs entirely in your browser.

ISBN-10 to ISBN-13 Converter

Convert between ISBN-10 and ISBN-13 instantly. Validates the check digit, shows the calculation steps, and supports batch conversion of multiple ISBNs at once. Free and no sign-up required.

Levenshtein Distance Calculator

Calculate the Levenshtein edit distance between two strings instantly. See every insertion, deletion, and substitution highlighted step by step. Includes similarity percentage, the full DP matrix, and real-world use cases.

Lorem Ipsum Generator

Generate lorem ipsum placeholder text instantly. Choose paragraphs, sentences, words, or bytes. Classic lorem ipsum or randomised. Free, fast, no ads in the way.

Number to Words Converter

Convert any number to words instantly. Spell out integers, decimals, negative numbers, and large numbers in full English text. Free online number to words converter.

PDF Text Extractor

Extract all text from a PDF file and copy it to your clipboard. Browse text by page, search within the extracted text, and download as a plain text file. Free, no uploads.

Random Case Converter

Instantly convert any text to random case online. Every letter is randomly uppercased or lowercased as you type. Free, no sign-up, works on any device.

Random Word Generator

Generate random words instantly. Filter by part of speech — nouns, verbs, adjectives, or adverbs. Choose how many words you need. Free online tool.

Remove Duplicate Lines

Remove duplicate lines from text instantly. Paste your text, click Remove Duplicates, and get clean deduplicated output. Supports case-insensitive matching and blank line removal. Free, no sign-up.

Remove Line Breaks

Remove line breaks and unwanted newlines from text instantly. Paste text copied from PDFs, emails, or documents and join it into clean readable paragraphs. Free online tool — no sign-up required.

Reverse Each Word

Reverse the letters of every word in your text while keeping words in the same order. Free online tool — type or paste and results update instantly.

Reverse Lines

Reverse the order of lines in any block of text instantly. Paste your content, optionally strip blank lines, and copy the result. Free online line reverser tool.

Reverse String

Reverse any string of text instantly in your browser. Type or paste and the reversed output appears live. Free online string reverser tool, no sign-up needed.

Reverse Words

Reverse the order of words in any text instantly. Paste a sentence and this free tool flips it so the last word comes first, keeping each word intact.

Sentence Counter

This online sentence counter will quickly and easily tell you how many sentences are in the text you type, copy and paste, or upload to it.

Text to Slug

Convert any text to a URL-friendly slug instantly. Lowercases text, replaces spaces with hyphens, and strips special characters. Great for blog posts, URLs, and file names. Free online slugify tool.

Word Counter

Count words, characters, vowels and consonants with this free online word counter. Just type, paste, or upload your text and our tool will take care of the rest.

Word Frequency Counter

Paste any text to see how often each word appears. Sort by frequency, filter out common stop words, and copy the results as CSV. Free word frequency analysis tool, no sign-up required.

More Tools

Converters

Hash & Encrypt

Line Tools

Finding the right tool online can make everything quicker and easier. Here's a growing collection of free online tools dealing with text and text files.

ISBN Converter

Convert between ISBN-10 and ISBN-13 with automatic format detection and check-digit validation. The tool shows a step-by-step breakdown of the check-digit calculation, supports batch conversion of multiple ISBNs at once, and clearly flags entries with invalid check digits. Useful for catalog management, library systems, and bookseller databases that need to work with both formats.

ISBN-10 has been superseded by ISBN-13 since 2007, but older records, citations, and APIs frequently still use the 10-digit format. Any ISBN-13 starting with 978 has an ISBN-10 equivalent; numbers starting with 979 do not.

Tool Categories