The 10 Best Free Online Text Tools in 2025

Text processing is something almost everyone does, but few people have a go-to toolkit. Here are the best free, browser-based text tools that require no installation and no sign-up.

1. remove-lines.com — List Cleaning & Deduplication

The best tool for removing duplicate lines, cleaning email lists, sorting, trimming, and transforming text lists. Completely private — all processing runs in your browser. remove-lines.com

2. Diffchecker — Text Comparison

Compare two blocks of text side by side and see exactly what changed. Invaluable for code reviews, document edits, and data comparisons. Available at diffchecker.com.

3. TextFixer — Miscellaneous Text Utilities

A collection of text tools including case conversion, word count, remove HTML tags, and more. Good for miscellaneous one-off text operations.

4. WordCounter — Word & Character Count

Paste any text to instantly see word count, character count, sentence count, and reading time. The gold standard for writers and editors.

5. JSON Formatter — JSON Beautifier/Minifier

Paste messy JSON and get it properly formatted and validated. Available at jsonformatter.curiousconcept.com and multiple other sites.

6. CSV to JSON Converter

Convert tabular CSV data to JSON format (and vice versa) instantly in the browser. Useful for developers working between frontend and backend data formats.

7. Regex101 — Regular Expression Tester

Build, test, and debug regular expressions in real time with syntax highlighting and a full match explanation. The best regex tool available anywhere.

8. Base64 Encode/Decode

Encode and decode Base64 strings instantly. Useful for dealing with API responses, image embeds, and authentication tokens.

9. URL Encoder/Decoder

Convert URLs to and from percent-encoded format. Essential for working with query strings and API parameters.

10. Markdown to HTML

Convert Markdown-formatted text to clean HTML. Multiple tools offer this, including dillinger.io and markdowntohtml.com.