DevStringTools
15 free, client-side tools for developers. No login. Your text stays in the browser.
Transform
Add Prefix to Lines
Prepend text to every line. Perfect for SQL inserts, JSON arrays, comment headers.
Sort Lines
Sort lines alphabetically, numerically, by length, or reverse.
Remove Duplicate Lines
Strip repeated lines. Optionally case-insensitive and trim-aware.
Find and Replace
Plain text or regex. Case-insensitive, global, multiline flags.
Lorem Ipsum Generator
Generate placeholder paragraphs, sentences, or words of Lorem Ipsum.
Excel Columns
Reshape a vertical list into N columns of tab-separated cells, ready to paste into Excel.
Format & Style
Remove Extra Spaces
Collapse runs of spaces, tabs, and blank lines. Trim trailing whitespace.
JSON Formatter & Validator
Pretty-print, minify, and validate JSON. Highlights syntax errors.
Case Converter
Convert text to camelCase, snake_case, kebab-case, PascalCase, and more.
URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug.
Markdown Preview
Live HTML preview of Markdown with GitHub-flavored extensions.