Developer Tools

40 tools · free · no sign-up

JSON formatters, encoders, regex testers, code minifiers

Developer

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⭐ FEATURED

Base64 to Image Converter

Convert a Base64 string or data URI back to a downloadable image. Auto-detects format, shows preview, and lets you download as PNG, JPG, or WebP.

Cron Expression Builder

Build and understand cron expressions with an interactive visual editor. Click to set schedules, see plain-English translations and next run times.

HTML Encoder / Decoder

Encode special characters to HTML entities or decode HTML entities back to text. Handles all named and numeric entities with live preview.

Image to Base64 Converter

Convert any image to a Base64 encoded string or data URI online for free. Supports PNG, JPG, and WebP output formats. Copy with one click.

JSON Minifier

Minify JSON by removing all whitespace and formatting. See the size reduction instantly. Free online JSON compressor with copy button.

JSON Prettifier

Format and pretty-print JSON with proper indentation online. Choose 2 spaces, 4 spaces, or tabs. Instant formatting with error detection and stats.

JSON Validator

Validate JSON syntax and find errors with line numbers online for free. Real-time validation as you type with detailed error messages and stats.

Markdown to HTML Converter

Convert Markdown to HTML code online for free. Supports headings, bold, italic, links, code blocks, lists, blockquotes, and more. Live preview included.

QR Code Generator

Generate QR codes for website URLs and plain text. Download as PNG or SVG with custom colours. Free, instant, no sign-up required.

Json

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CSV to JSON Converter

Convert CSV data to JSON format online. Auto-detects delimiters, supports headers as keys, and outputs pretty or compact JSON. Copy with one click.

JSON Escape / Unescape

Escape special characters in strings for JSON or unescape JSON strings back to readable text. Handles newlines, tabs, quotes, and backslashes.

JSON Formatter & Validator

Format, minify and validate JSON with syntax highlighting. Shows error locations, key count, nesting depth and size stats

JSON Minifier

Minify JSON by removing all whitespace and formatting. See the size reduction instantly. Free online JSON compressor with copy button.

JSON Prettifier

Format and pretty-print JSON with proper indentation online. Choose 2 spaces, 4 spaces, or tabs. Instant formatting with error detection and stats.

JSON to CSV Converter

Convert JSON arrays to CSV format online. Handles nested objects with dot notation, supports comma/tab/semicolon delimiters. Copy or download the CSV.

JSON to Plain Text

Extract plain text values from JSON data. Recursively walks the JSON structure and outputs values, keys, or full paths as readable text.

JSON Validator

Validate JSON syntax and find errors with line numbers online for free. Real-time validation as you type with detailed error messages and stats.

JWT Decoder

Decode JWT tokens to see the header, payload and expiry status. Colour-coded sections with formatted JSON output. Paste any JWT to inspect its contents.

Web

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CSS Box Shadow Generator

Build CSS box shadows visually with live preview. Adjust offset, blur, spread, colour, and opacity. Stack multiple layers and copy the CSS.

CSS Gradient Generator

Create beautiful CSS gradients with a visual builder. Choose colours, positions, angles, and gradient type. Copy the CSS with vendor prefixes.

CSS Minifier

Minify CSS by removing comments, whitespace and unnecessary characters. See original and minified size with savings percentage. Copy or download the result.

JavaScript Minifier

Minify JavaScript by removing comments and collapsing whitespace. See compression statistics with original and minified size comparison.

JWT Decoder

Decode JWT tokens to see the header, payload and expiry status. Colour-coded sections with formatted JSON output. Paste any JWT to inspect its contents.

Pixel to REM Converter

Convert pixels to REM units and back. Set your base font size, see a reference table of common values, and copy CSS with one click.

HTML Entity Encoder

Encode text to HTML entities or decode entities back to text. Handles named, numeric and hex entities. Bulk text support with instant copy to clipboard.

Slug Generator

Convert any title or text into a clean URL-friendly slug. Options for separator style, max length and accent transliteration. Copy to clipboard instantly.

Text

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HTML to Text Converter

Strip HTML tags and extract plain text content. Optionally preserves line breaks from block elements like paragraphs, divs, and list items.

JSON to Plain Text

Extract plain text values from JSON data. Recursively walks the JSON structure and outputs values, keys, or full paths as readable text.

QR Code Generator

Generate QR codes for website URLs and plain text. Download as PNG or SVG with custom colours. Free, instant, no sign-up required.

String to Binary Converter

Convert text to binary and binary back to text. Bidirectional conversion with space, none, or newline separator options. Shows byte count.

Lorem Ipsum Generator

Generate placeholder lorem ipsum text by paragraphs, sentences or words. Copy to clipboard with word and character count display

Slug Generator

Convert any title or text into a clean URL-friendly slug. Options for separator style, max length and accent transliteration. Copy to clipboard instantly.

Csv

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CSV Column Extractor

Select and extract specific columns from CSV data. Auto-detects headers and lets you toggle which columns to include in the output.

CSV Delimiter Changer

Change the delimiter in CSV files from comma to tab, semicolon, pipe, or any custom character. Auto-detects the input delimiter.

CSV to JSON Converter

Convert CSV data to JSON format online. Auto-detects delimiters, supports headers as keys, and outputs pretty or compact JSON. Copy with one click.

CSV Transpose

Swap rows and columns in CSV data. Converts rows to columns and columns to rows with a live preview showing the dimension change.

CSV Validator

Validate CSV structure and find problems like inconsistent column counts, unclosed quotes, and empty rows. Live validation with line numbers.

JSON to CSV Converter

Convert JSON arrays to CSV format online. Handles nested objects with dot notation, supports comma/tab/semicolon delimiters. Copy or download the CSV.

Css

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CSS Box Shadow Generator

Build CSS box shadows visually with live preview. Adjust offset, blur, spread, colour, and opacity. Stack multiple layers and copy the CSS.

CSS Gradient Generator

Create beautiful CSS gradients with a visual builder. Choose colours, positions, angles, and gradient type. Copy the CSS with vendor prefixes.

CSS Minifier

Minify CSS by removing comments, whitespace and unnecessary characters. See original and minified size with savings percentage. Copy or download the result.

Image to Data URI Converter

Convert any image to a data URI string for embedding directly in HTML or CSS. Supports PNG, JPG, and WebP output formats.

Pixel to REM Converter

Convert pixels to REM units and back. Set your base font size, see a reference table of common values, and copy CSS with one click.

Decode

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Base64 to Image Converter

Convert a Base64 string or data URI back to a downloadable image. Auto-detects format, shows preview, and lets you download as PNG, JPG, or WebP.

HTML Encoder / Decoder

Encode special characters to HTML entities or decode HTML entities back to text. Handles all named and numeric entities with live preview.

JSON Escape / Unescape

Escape special characters in strings for JSON or unescape JSON strings back to readable text. Handles newlines, tabs, quotes, and backslashes.

QR Code Reader

Scan and decode QR codes from uploaded images. Uses your browser's built-in barcode detection. Shows the decoded text or URL with copy and open buttons.

String to Binary Converter

Convert text to binary and binary back to text. Bidirectional conversion with space, none, or newline separator options. Shows byte count.

Html

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HTML Encoder / Decoder

Encode special characters to HTML entities or decode HTML entities back to text. Handles all named and numeric entities with live preview.

HTML to Text Converter

Strip HTML tags and extract plain text content. Optionally preserves line breaks from block elements like paragraphs, divs, and list items.

Image to Data URI Converter

Convert any image to a data URI string for embedding directly in HTML or CSS. Supports PNG, JPG, and WebP output formats.

Markdown to HTML Converter

Convert Markdown to HTML code online for free. Supports headings, bold, italic, links, code blocks, lists, blockquotes, and more. Live preview included.

HTML Entity Encoder

Encode text to HTML entities or decode entities back to text. Handles named, numeric and hex entities. Bulk text support with instant copy to clipboard.

Other

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Markdown Preview

Write markdown and see a live rendered preview side by side. Supports headers, bold, italic, links, images, code blocks, lists and more

Meta Tag Previewer

Preview how your page will appear in Google search results, Twitter cards and Facebook shares. Generate HTML meta tags with character warnings

Password Generator

Generate strong, secure passwords with customisable length and character options. Uses cryptographically secure randomisation.

Regex Tester

Test regular expressions with live match highlighting, captured groups and match positions. Quick-insert buttons for common patterns

Robots.txt Generator

Build a robots.txt file visually with rules for different bots. Quick presets for common configurations including AI crawler blocking

SQL Formatter

Format messy SQL queries with proper indentation and keyword highlighting. Options for uppercase keywords and indent size. Supports SELECT, JOIN, WHERE and more.

Hash Generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text. All four algorithms calculated simultaneously with copy buttons

UUID Generator

Generate random UUID v4 identifiers. Bulk generation up to 100, with options for uppercase and with or without hyphens