Developer Tools

Useful online tools for developers, debugging, formatting, encoding, and testing.

Online Developer Tools

Format, validate, encode, decode, convert, and inspect developer data quickly.

Base64 Encode / Decode

Encode or decode Base64 strings instantly.

Color Converter

Convert HEX, RGB, and other color values quickly.

Color Contrast Checker

Check text and background color contrast with WCAG AA and AAA results.

Cron Expression Generator

Build cron schedules easily with readable options.

CSS Minifier

Minify CSS code to reduce size and improve delivery.

CSS Clamp Generator

Generate responsive CSS clamp() values for fluid typography and spacing.

Hash Generator

Generate MD5, SHA hashes, and other common hash values.

HTML Entity Encode / Decode

Convert text to or from HTML entities instantly.

HTML Formatter

Format and beautify HTML code for readability.

Markdown Previewer

Write Markdown and preview formatted HTML instantly in your browser.

IP Subnet Calculator

Calculate subnet masks, hosts, and network ranges.

JS Minifier

Minify JavaScript code for faster loading.

JSON Formatter

Format and beautify JSON data instantly.

JSON to CSV Converter

Convert JSON data into CSV format quickly.

JSON Validator

Validate JSON structure and find syntax errors.

JWT Decoder

Decode JWT tokens and inspect payload data.

Password Generator

Create secure passwords instantly with custom options.

Random String Generator

Generate random strings for tokens and identifiers.

Regex Tester

Test and debug regular expressions quickly.

SQL Formatter

Beautify SQL queries for easier reading and debugging.

Text Diff Checker

Compare two text blocks and spot differences instantly.

Timestamp Converter

Convert Unix timestamps to readable dates and times.

URL Query String Parser

Parse URL query parameters into a decoded table and structured JSON output.

URL Encode / Decode

Encode or decode URL strings safely and quickly.

User Agent Parser

Inspect browser, OS, device, and user agent details.

UUID Generator

Generate UUID values instantly for apps and databases.

JSON to Table

Convert JSON data into structured tables instantly.

CSV Viewer

View and analyze CSV files in table format easily.

CSV to JSON Converter

Convert CSV data into JSON format quickly.

UUID Generator Bulk

Generate multiple UUIDs at once for bulk usage.

Color Converter HEX RGB

Convert HEX to RGB and RGB to HEX instantly.

MD5 Generator

Generate MD5 hash from text instantly.

SHA1 Generator

Generate SHA1 hash values quickly from text input.

SHA256 Generator

Generate SHA256 hash securely for text data.

SHA512 Generator

Generate SHA512 hash values instantly from text input.

UUID Validator

Validate UUID format and check correctness instantly.

HTML Minifier

Minify HTML code to reduce size and improve performance.

Base64 to Image

Convert Base64 string into image preview instantly.

Image to Base64

Convert image files into Base64 encoded strings instantly.

CSS Beautifier

Format and beautify CSS code for better readability.

JS Beautifier

Format and beautify JavaScript code for better readability.

JSON Beautifier

Beautify and format JSON data for better readability instantly.

HTML Beautifier

Format and beautify HTML code for better readability instantly.

XML Beautifier

Format and beautify XML code for better readability instantly.

XML Minifier

Minify XML code to reduce size and remove unnecessary whitespace.

YAML Beautifier

Beautify and format YAML data for better readability instantly.

YAML Minifier

Minify YAML data by removing unnecessary spacing and blank lines.

CSV Formatter

Format and clean CSV data for better readability instantly.

CSV Minifier

Minify CSV data by removing unnecessary spaces and blank lines.

UUID Extractor

Extract UUID values instantly from text, logs, or code.

Email Extractor

Extract email addresses instantly from text, logs, or documents.

URL Extractor

Extract URLs instantly from text, logs, or documents.

JSON Minifier

Minify JSON data by removing unnecessary spaces and line breaks instantly.

Base64 Validator

Validate Base64 strings instantly and detect invalid encoding.

HTML Entity Encoder

Encode text into HTML entities instantly for safe markup output.

HTML Entity Decoder

Decode HTML entities instantly back into readable text.

CSS Validator

Validate CSS code instantly and detect syntax errors.

Email Header Analyzer

Analyze email headers to inspect routing, sender info, and SPF/DKIM/DMARC results.

HTTP Header Parser

Parse raw HTTP headers to inspect request, response, server, and content details.

HTML Table Extractor

Extract tables from HTML and convert them into clean structured data or CSV.

CSV Column Extractor

Extract selected columns from CSV data and rebuild clean output instantly.

Email Address List Cleaner

Clean, extract, normalize, and deduplicate email address lists for imports and outreach.

CSV Row Filter

Filter CSV rows by keyword, column value, match type, and keep only the records you need.

Inspect and transform development data

Developer tools provide quick, focused helpers for debugging payloads, checking syntax, converting formats, and preparing sample values during development and support work.

Debug API responses

Format and validate JSON, inspect JWT payloads, parse headers, or compare two responses before changing application code.

Prepare data for another system

Convert between JSON and CSV, encode URLs or Base64 values, and clean structured data for imports, tests, and documentation.

Check frontend output

Beautify or minify HTML, CSS, and JavaScript, verify color contrast, and generate responsive CSS values.

A practical tool workflow

  1. Inspect: Open the formatter, validator, parser, or viewer that matches the data you received.
  2. Correct: Use the reported structure or syntax details to fix malformed input and confirm it validates.
  3. Convert or export: Transform the clean result into the format needed by your application, test case, or teammate.

Frequently asked questions

Are these tools only for software developers?

No. Analysts, QA testers, technical writers, support teams, and anyone working with structured data can use the formatters, converters, and extractors.

What is the difference between a formatter and a validator?

A formatter improves readability by adding consistent spacing and indentation. A validator checks whether the input follows the required syntax and reports problems.