Free Online Tools for Developers & Creators
27+ powerful browser-based utilities. Format JSON, convert text, generate CSS, and more — all processing happens locally on your device.
Text Tools
Transform, clean, and format text instantly
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and more.
Word & Character Counter
Count words, characters, sentences, paragraphs, and estimate reading & speaking time.
Remove Duplicate Lines
Remove duplicate lines from text. Keep unique lines, preserve order, and clean your data.
Remove / Add Line Breaks
Remove or add line breaks from text. Convert single-line to multi-line and vice versa.
Sort Lines
Sort lines alphabetically, numerically, by length, or in reverse. Remove blanks optionally.
Text Reverser
Reverse text, words, or lines. Flip your text backwards instantly.
URL Slug Generator
Convert text to URL-friendly slugs. Generate SEO-friendly URLs from any text.
Find & Replace Text
Find and replace text with support for regex, case-sensitive, and whole-word matching.
Lorem Ipsum Generator
Generate lorem ipsum placeholder text. Choose paragraphs, sentences, or words.
Markdown to HTML
Convert Markdown text to clean HTML code with live preview.
Developer Tools
Essential utilities for developers
JSON Formatter & Validator
Format, validate, and beautify JSON data. Minify or prettify with customizable indentation.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 to text. Supports UTF-8.
URL Encode / Decode
Encode or decode URLs. Escape special characters for safe URL usage.
UUID Generator
Generate random UUID v4 identifiers. Bulk generate and copy with one click.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text. Compare hashes.
JWT Decoder
Decode and inspect JWT tokens. View header, payload, and expiration without sending to server.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports milliseconds.
Regex Tester
Test regular expressions with real-time matching, capture groups, and match highlighting.
CSS Generators
Visual CSS code generators
CSS Gradient Generator
Create beautiful CSS linear and radial gradients with a visual editor. Copy the CSS code.
CSS Box Shadow Generator
Design multi-layer CSS box shadows with a visual editor. Preview and copy code.
Glassmorphism Generator
Create frosted glass UI effects with customizable blur, transparency, and border.
Flexbox Playground
Learn and experiment with CSS Flexbox properties interactively. Visual flexbox builder.
Border Radius Generator
Create custom CSS border-radius values with a visual editor. Create organic blob shapes.
Converters
Convert between formats and units
PX to REM Converter
Convert pixels to rem units and vice versa. Set custom base font size.
Color Converter
Convert colors between HEX, RGB, HSL, and OKLCH. Preview colors in real time.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases.
CSV to JSON Converter
Convert CSV data to JSON format and vice versa. Handle headers and custom delimiters.
Why Docoline?
All tools run entirely in your browser. No uploads, no server processing, no accounts required.
100% Private
Your data never leaves your browser. No uploads, no tracking.
Lightning Fast
No server round-trips. Instant results powered by your browser.
Always Free
No signups, no subscriptions. Every tool is free forever.