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A smart collection of 209+ free, open-source tools. Built for developers, running 100% locally in your browser.

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Featured Tools

JWT Decoder

Decode and inspect JSON Web Tokens.

JSON to TypeScript

Generate Typescript Interfaces.

UUID Generator V4

Generate V4 UUIDs.

Meta Tag Generator

Generate SEO Meta Tags.

New Arrivals

String to JSON

Escape string to JSON.

Small Text Generator

Superscript & Subscript.

Text Cleaner

Clean & Format Text.

Meta Tag Generator

Generate SEO Meta Tags.

CIDR Calculator

IPv4 CIDR Calculations.

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All Developer Tools

HEX to Pantone

Color

Convert HEX color codes to the nearest Pantone (PMS) color.

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RGB to Pantone

Color

Convert RGB color values to the nearest Pantone color.

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HSV to Pantone

Color

Convert HSV color values to the nearest Pantone color.

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CMYK to Pantone

Color

Convert CMYK color values to the nearest Pantone color.

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CMYK to HEX

Color

Convert CMYK color codes to HEX format.

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CMYK to RGB

Color

Convert CMYK color codes to RGB format.

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CMYK to HSV

Color

Convert CMYK color codes to HSV format.

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HSV to HEX

Color

Convert HSV color codes to HEX format.

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HSV to RGB

Color

Convert HSV color codes to RGB format.

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HSV to CMYK

Color

Convert HSV color codes to CMYK format.

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HEX to RGB

Color

Convert HEX color codes to RGB format.

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HEX to CMYK

Color

Convert HEX color codes to CMYK format.

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HEX to HSV

Color

Convert HEX color codes to HSV format.

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RGB to HEX

Color

Convert RGB color codes to HEX format.

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RGB to CMYK

Color

Convert RGB color codes to CMYK format.

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RGB to HSV

Color

Convert RGB color codes to HSV format.

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Pantone to HEX

Color

Convert Pantone colors to HEX format.

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Pantone to RGB

Color

Convert Pantone colors to RGB format.

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Pantone to CMYK

Color

Convert Pantone colors to CMYK format.

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Pantone to HSV

Color

Convert Pantone colors to HSV format.

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Length Converter

Unit

Convert between meters, kilometers, miles, feet, inches, and other length units.

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Weight Converter

Unit

Convert between kilograms, pounds, ounces, grams, and other weight units.

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Volume Converter

Unit

Convert between liters, gallons, cups, pints, and other volume units.

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Area Converter

Unit

Convert between square meters, acres, hectares, and other area units.

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Time Converter

Unit

Convert between seconds, minutes, hours, days, and other time units.

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Unix Timestamp Converter

Unit

Convert Unix timestamps to human-readable dates and relative time strings.

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SQL to CSV

SQL

Convert SQL INSERT statements to CSV format.

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SQL to JSON

SQL

Convert SQL INSERT statements to JSON format.

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SQL to XML

SQL

Convert SQL INSERT statements to XML format.

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SQL to YAML

SQL

Convert SQL INSERT statements to YAML format.

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SQL to HTML

SQL

Convert SQL INSERT statements to HTML Table.

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Base64 Encoder/Decoder

Encode/Decode

Encode and decode Base64 data.

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Base32 Encoder/Decoder

Encode/Decode

Encode and decode Base32 data.

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Base58 Encoder/Decoder

Encode/Decode

Encode and decode Base58 data.

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URL Encoder/Decoder

Encode/Decode

Encode and decode URL components.

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HTML Encoder/Decoder

Encode/Decode

Encode and decode HTML entities.

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PNG to JPG

Image

Convert PNG images to JPG format.

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JPG to PNG

Image

Convert JPG images to PNG format.

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BMP to PNG

Image

Convert BMP images to PNG format.

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Image to SVG

Image

Convert raster images to SVG vector graphics.

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Favicon Generator

Image

Generate favicons for websites.

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QR Code Generator

Image

Generate customizable QR codes.

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YouTube Thumbnail

Image

Download Video Thumbnails.

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JSON to CSV

Converter

Convert JSON data to CSV format.

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JSON ⇄ Dart

Converter

Bidirectional converter: JSON to Dart classes or Dart to JSON.

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CSV to JSON

Converter

Convert CSV data to JSON format.

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Markdown to HTML

Converter

Convert Markdown text to HTML.

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JSON to YAML

Converter

Convert JSON data to YAML format.

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YAML to JSON

Converter

Convert YAML data to JSON format.

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JSON Validator

Development

Validate JSON data.

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XML Validator

Development

Validate XML data.

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YAML Validator

Development

Validate YAML data.

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Case Converter

Converter

Convert text case (Upper, Lower, Camel, etc).

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Text Shuffler

String

Randomize lines.

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Binary to Text

Converter

Binary <-> ASCII.

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Text Cleaner

String

Remove spaces/duplicates.

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Word Counter

String

Count words/chars/lines.

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Number to Words

String

Convert Number to Text.

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Reverse String

String

Reverse text characters.

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Crontab Generator

Development

Cron schedule helper.

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HTML Stripper

Web

Remove HTML tags.

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JSON to TSV

Converter

Convert JSON to TSV.

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Upside Down Text

String

Flip text.

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List Comparator

String

Compare two lists (A vs B).

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Text Analyzer

String

Word count, reading time & stats.

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String Splitter

String

Split text by delimiter.

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Bitwise Calculator

Number

AND, OR, XOR.

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JSON Diff

Development

Compare two JSON objects side-by-side.

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JWT Decoder

Development

Decode and inspect JSON Web Tokens.

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Regex Tester

Development

Test and debug regular expressions.

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UUID Generator

Development

Generate V4 UUIDs.

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Password Generator

Other

Generate strong passwords.

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Lorem Ipsum

Other

Generate placeholder text.

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JSON Beautifier

Development

Beautify & Minify JSON.

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XML Beautifier

Development

Beautify & Minify XML.

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HTML Beautifier

Development

Beautify & Minify HTML.

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CSS Beautifier

Development

Beautify & Minify CSS.

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JS Beautifier

Development

Beautify JavaScript.

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CSS Box Shadow

Development

Layered shadow generator.

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CSS Gradient

Development

Linear & Radial gradients.

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Border Radius

Development

CSS rounded corners.

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Cursor Viewer

Development

All CSS cursors.

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Px to Rem

Development

Unit converter.

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MD5 Generator

Encode/Decode

Generate MD5 hash.

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SHA1 Generator

Encode/Decode

Generate SHA1 hash.

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SHA256 Generator

Encode/Decode

Generate SHA256 hash.

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SHA512 Generator

Encode/Decode

Generate SHA512 hash.

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JSON Escape

Encode/Decode

Escape/Unescape JSON.

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XML Escape

Encode/Decode

Escape/Unescape XML.

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Markdown to HTML

Converter

Convert Markdown to HTML.

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HTML to Markdown

Converter

Convert HTML to Markdown.

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CSV to HTML

Converter

CSV to HTML Table.

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HTML to CSV

Converter

HTML Table to CSV.

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JSON to Java

Converter

JSON to Java POJO.

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XML to JSON

Converter

XML to JSON.

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XML to YAML

Converter

XML to YAML.

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HTML Escape

Encode/Decode

Escape/Unescape HTML.

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Java Escape

Encode/Decode

Escape/Unescape Java.

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Base Converter

Converter

Convert Decimal/Binary/Hex/Octal.

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Binary Converter

Converter

Binary <-> Dec/Hex/Oct.

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Hex Converter

Converter

Hex <-> Dec/Bin/Oct.

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Decimal Converter

Converter

Decimal <-> Bin/Hex/Oct.

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Credit Card Tools

Development

Validate/Generate Credit Cards.

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Text Diff

Development

Compare two texts.

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Responsive Tester

Web

Test screen sizes.

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Device Info

Web

My screen & browser info.

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Line Chart Maker

Other

Create Line Charts.

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Bar Chart Maker

Other

Create Bar Charts.

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Pie Chart Maker

Other

Create Pie Charts.

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Doughnut Chart Maker

Other

Create Doughnut Charts.

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Scatter Plot Maker

Other

Create Scatter Plot Charts.

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JSON Viewer

Development

Interactive JSON Tree.

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URL Parser

Web

Parse URL/Query strings.

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Encryption/Decryption

Encode/Decode

AES Encrypt/Decrypt.

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HMAC Generator

Encode/Decode

HMAC-MD5/SHA1/256.

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My IP Address

Web

Show your public IP.

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DNS Lookup

Web

Check DNS records.

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IP Converter

Web

IP <-> Decimal/Binary.

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SQL Formatter

Formatter

Beautify SQL Queries.

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Code Editor

Development

Edit & Format Code.

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HTML Live Editor

Development

Real-time HTML Preview.

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Image to Base64

Base64

Convert images to Base64 string.

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Base64 to Image

Base64

Convert Base64 string to image.

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JSON to Base64

Base64

Convert JSON data to Base64 string.

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Base64 to JSON

Base64

Convert Base64 to JSON string.

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XML to Base64

Base64

Convert XML data to Base64 string.

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Base64 to XML

Base64

Convert Base64 to XML string.

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YAML to Base64

Base64

Convert YAML data to Base64 string.

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Base64 to YAML

Base64

Convert Base64 to YAML string.

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CSV to Base64

Base64

Convert CSV data to Base64 string.

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Base64 to CSV

Base64

Convert Base64 to CSV string.

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Hex to Base64

Base64

Convert Hex string to Base64.

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Base64 to Hex

Base64

Convert Base64 to Hex string.

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Binary to Base64

Base64

Convert Binary string to Base64.

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Base64 to Binary

Base64

Convert Base64 to Binary string.

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Octal to Base64

Base64

Convert Octal string to Base64.

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Base64 to Octal

Base64

Convert Base64 to Octal string.

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Text to ASCII

Converter

Convert text and code to ASCII decimal values.

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ASCII to Text

Converter

Convert ASCII decimal values to readable text.

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JSON Minifier

Development

Minify and compress JSON data.

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UTF-8 Converter

Encode/Decode

Convert text to UTF-8 encoded bytes.

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UTF-8 Decoder

Encode/Decode

Decode UTF-8 bytes to text.

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Hex to UTF-8

Encode/Decode

Convert hex string to UTF-8 text.

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Random IP Generator

Random

Generate random IPv4/IPv6 addresses.

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Random Number Generator

Random

Generate random numbers in range.

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Random Date Generator

Random

Generate random dates.

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Random Hex Generator

Random

Generate random hex strings.

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Random String Generator

Random

Generate random alphanumeric strings.

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Random JSON Generator

Random

Generate random JSON objects.

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Random XML Generator

Random

Generate random XML documents.

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JSON to JSONL

Converter

Convert JSON to JSON Lines.

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HTML to JSX

Converter

Convert HTML to JSX.

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Markdown Table Generator

Development

Create Markdown tables visually.

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JSON to TypeScript

Converter

Generate Typescript Interfaces.

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JSON to TOML

Converter

Convert JSON to TOML.

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TOML to JSON

Converter

Convert TOML to JSON.

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JSON to PHP Array

Converter

Convert JSON to PHP Array.

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Morse Code Translator

String

Text <-> Morse Code.

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UUID Generator V4

Random

Generate V4 UUIDs.

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Lorem Ipsum Generator

Random

Generate placeholder text.

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Checksum Calculator

Encode/Decode

MD5, SHA1, SHA256 hashes.

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Slug Generator

String

Make URL-friendly slugs.

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String to JSON

Converter

Escape string to JSON.

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Small Text Generator

String

Superscript & Subscript.

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Text Cleaner

String

Clean & Format Text.

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Meta Tag Generator

Web

Generate SEO Meta Tags.

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CIDR Calculator

Web

IPv4 CIDR Calculations.

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Image Resizer

Image

Resize images to specific dimensions.

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SQL Studio

SQL

Advanced in-browser SQL database manager. Create tables, run joins, and export data.

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Advanced Color Picker

Color

Professional color tools: Harmonies, Gradients, and A11y Contrast Checker.

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Delimiter Converter

Text

Convert columns to delimited lists (CSV, Pipe, etc.) and vice versa.

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Age Calculator

Calculator

Detailed age stats, next birthday countdown, and chronological age.

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JSON Placeholder API

Web

Free mock REST API for testing and prototyping (Posts, Users, Todos).

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Scientific Calculator

Calculator

Advanced calculator with scientific functions and history.

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Image to PDF

PDF

Convert images to a single PDF document.

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PDF to Image

PDF

Convert PDF pages to images.

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Aspect Ratio

Calculator

Calculate dimensions.

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Roman Numeral

Converter

Decimal ↔ Roman.

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Factorial Calc

Calculator

Calculate n!.

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Prime Checker

Number

Is number prime?

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Keycode Info

Development

JS keyboard events.

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Choice Picker

Random

Pick random option.

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Coin Flipper

Random

Heads or Tails.

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Dice Roller

Random

Roll virtual dice.

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Pass Strength

Encode/Decode

Test security.

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NanoID Gen

Development

Modern unique IDs.

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Text Sorter

String

Sort lines A-Z.

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Diff Checker

String

Compare text diffs.

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ASCII Art

String

Text to Banner.

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Rot13 / Cipher

String

Encrypt text.

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Fake Data Gen

Development

Mock user data.

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Image Cropper

Image

Crop images.

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Image Filters

Image

Apply visual filters.

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SVG Blob Gen

Image

Organic SVG shapes.

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Color Extractor

Image

Palette from image.

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cURL Converter

Development

cURL to Code.

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UA Parser

Development

Parse User Agent.

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Chmod Calc

Development

Unix permissions.

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CSS Triangle

Development

Generate CSS triangles.

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Flexbox Gen

Development

Visual Layout.

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Percentage Calc

Math

Calculate percentages.

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Date Difference

Math

Days between dates.

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Time Zone Conv

Converter

World clock.

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Loan Calc

Math

Mortgage payments.

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Stopwatch

Math

Timer & Laps.

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IP Lookup

Network

Geo & ISP info.

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Subnet Calc

Network

CIDR & Masks.

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What Is My IP

Network

Public IP Check.

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Ping Tool

Network

Website latency.

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