⭐ Starlight Tools / Text Utilities

Text & CSV Tools

Free browser-based text and CSV tools for word counts, case conversion, sorting, cleaning, diffs, and readability—everything runs locally for privacy. Try our Word Counter, Case Converter, CSV Viewer, or Text Diff Viewer.

Text word counter showing word character sentence and reading time counts

Word Counter

Count words, characters, numbers and more. v1.0

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Text case converter toggling upper lower sentence capitalised and alternating cases

Text Case Converter

Convert text to UPPER, lower, Sentence, Capitalised or aLtErNaTiNg case. v1.0

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Text Alphabetic numeric sorter arranging lines A to Z or 0 to 9 with ascending descending options

Alphabetic Numeric Sorter

Sort lines of text alphabetically or numerically. v1.0

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Text Whitespace cleaner stripping extra line breaks tabs and spaces

Line Break & Whitespace Cleaner

Strip or reduce extra line breaks and spaces. v1.0

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Text Duplicate line remover with case and whitespace options to dedupe lists

Duplicate Line Remover

Remove identical lines with ignore-case / whitespace options. v1.0

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Text diff viewer highlighting inline additions deletions and changes between two texts

Text Diff Viewer

Compare two pieces of text and highlight the differences. v1.0

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Text CSV viewer with sortable columns filters and local file upload

CSV Viewer with Filters & Sort

Upload, filter and sort CSV data on the fly. v1.0

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Text Readability score calculator computing Flesch Kincaid and other metrics from pasted text

Readability Score Calculator

Compute Flesch-Kincaid and other readability metrics. v1.0

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Text keyword density checker listing top keywords and phrases for SEO

Keyword Density Checker

Analyse keyword and phrase frequency for SEO. v1.0

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Text replacement tool interface for find and replace with options

Text Replacement Tool

Find and replace text instantly and privately in your browser. v1.0

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Text Zalgo glitch text generator adding creepy combining marks to letters

Zalgo Glitch Text Generator

Transform your text into unsettling, glitched Zalgo text. v1.0

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Text Levenshtein distance calculator highlighting insertions deletions and substitutions between strings

Levenshtein Distance

Compare two strings and see insertions, deletions, and substitutions highlighted. Character or word mode. 100% client-side. v1.0

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Frequently asked questions

Do my text files ever leave my device?

No. All processing happens locally in your browser – nothing is uploaded.

Is there a file-size limit?

Only what your computer can comfortably handle in the browser.

Which formats are supported?

TXT, CSV and anything you paste into the editors.

About These Text & CSV Tools

These text and CSV utilities run entirely in your browser—no uploads or sign-ups—covering word counts, case changes, cleaning, diffing, readability, and lightweight data inspection.

Popular picks include the Word Counter, Case Converter, CSV Viewer, and Text Diff Viewer. Use them free anytime.