Choose a tool by the job you need to finish.

Convert between binary, octal, decimal, and hex

numbers

Strictly decode standard Base64 into UTF-8 text

encoding

Encode UTF-8 text with standard RFC 4648 Base64

encoding

Decode hexadecimal string to readable text

encoding

Create keyed hash message authentication code

hashing

Beautify JSON with proper indentation and spacing

formatters

Strip whitespace from JSON for smallest payload

formatters

Convert JSON into YAML format

converters

Check whether JSON text is valid and show the browser parser error

formatters

Hash UTF-8 text with SHA-256 using Web Crypto

hashing

Hash UTF-8 text with SHA-512 using Web Crypto

hashing

Encode text as hexadecimal representation

encoding

Convert Unix timestamp to human-readable date

datetime

Decode percent-encoded URL strings

encoding

Percent-encode special characters for URLs

encoding

Break a URL into protocol, host, path, and query

web reference

Generate cryptographically random RFC 9562 UUIDv4 values

hashing

Clean up YAML indentation and structure

formatters

Convert YAML into JSON format

converters

Parse YAML and report syntax errors

formatters

Build a local mail-hop timeline and explain SPF, DKIM, and DMARC results

niche

Analyze HAR traffic locally and export a redacted copy with secrets removed

niche

Calculate exact IPv4 and IPv6 network boundaries locally with arbitrary precision

niche

Inspect SAML XML locally, surface signing state, and redact likely secrets

niche

Create .gitignore files for any language or framework

web reference

Generate .htaccess rules for redirects and rewrites

web reference

Calculate exact age from birth date

numbers

All ASCII characters with decimal, hex, and binary

web reference

Convert ASCII codes to characters

encoding

Decode Base64 and render as downloadable image

encoding

Hash passwords using bcrypt algorithm

hashing

Decode binary string to readable text

encoding

Compute Body Mass Index from height and weight

numbers

Convert text to camelCase

text

Count characters with and without spaces

text

Simulate how colors appear with color blindness

color

Generate harmonious color palettes

color

Visual color picker with HEX, RGB, HSL output

color

Convert text to CONSTANT_CASE

text

Check color contrast against WCAG standards

color

Build cron expressions from a friendly UI

datetime

Explain a cron expression in plain English

datetime

Reformat CSS with consistent indentation

formatters

Strip comments and whitespace from CSS

formatters

Explains all CSS units with examples

web reference

Parse CSV rows into JSON array of objects

converters

Convert CSV data into a Markdown table

converters

Convert comma-separated to tab-separated values

converters

Render CSV as a sortable, searchable table

niche

Calculate days, weeks, months between two dates

numbers

Convert a date to Unix timestamp

datetime

Generate rows of fake CSV data

generators

Generate arrays of dummy JSON objects

generators

Strip all EXIF metadata from images

image

Display camera and GPS metadata from images

image

Create fake names, emails, addresses for testing

generators

Generate favicons in all sizes from a source PNG

image

Encode any file into a Base64 string

encoding

Find and replace text with optional regex

text

Build CSS gradients with live preview

color

Pretty-print GraphQL queries and schemas

formatters

Convert hexadecimal color to RGB values

color

Convert between HSL and other color formats

color

Convert between HSV and other color formats

color

Reverse HTML entities to original characters

encoding

Convert characters to HTML entity equivalents

encoding

Beautify HTML with proper tag indentation

formatters

Remove whitespace and comments from HTML

formatters

Searchable HTML entities and characters reference

web reference

Translate HTML content into Markdown

converters

Searchable table of HTTP status codes

web reference

Extract dominant colors from an image

color

Reduce image file size with adjustable quality

image

Visually crop images and download results

image

Convert between PNG, JPG, WebP, and AVIF

image

Resize images to specific dimensions

image

Encode an image into a Base64 data URI

encoding

Parse ISO 8601 date strings into components

datetime

Reformat JavaScript with consistent style

formatters

Compress JavaScript for production

formatters

Test JMESPath queries used in AWS CLI

niche

Generate C# class definitions from JSON

converters

Flatten JSON array into a CSV table

converters

Generate Go struct definitions from JSON

converters

Generate Java POJO classes from JSON

converters

Generate TypeScript interfaces from JSON

converters

Transform JSON into equivalent XML markup

converters

Test JSONPath queries against JSON samples

niche

Decode, verify, edit, and re-sign JWTs

hashing

Decode JWT to display header and payload

hashing

Convert text to kebab-case

text

Convert between meters, feet, miles, and more

numbers

Count lines in a block of text

text

Generate placeholder dummy text

text

Side-by-side Markdown editor and preview

niche

Render Markdown text into HTML

converters

Produce 128-bit MD5 hash of input text

hashing

Render Mermaid syntax into diagrams

niche

Generate HTML meta tags for SEO and social sharing

web reference

Look up MIME types for file extensions

web reference

Build realistic JSON responses for API prototyping

generators

Translate between text and Morse code

encoding

Preview how a URL appears when shared on social media

web reference

Convert text to PascalCase

text

Generate strong random passwords

hashing

Evaluate password strength and crack time

generators

Calculate percentages and percentage change

numbers

Generate placeholder images with optional text

generators

Render PlantUML syntax into UML diagrams

niche

Encode/decode internationalized domain names

encoding

Generate QR codes from text or URLs

image

Scan QR codes from a bounded local image file

image

Generate random numbers in a specified range

generators

Generate random strings with custom character sets

generators

Generate cryptographically random tokens

hashing

Generate structured README.md from a form

web reference

Test regex patterns with live highlighted matches

text

Render regex as a railroad diagram

text

Strip duplicate lines from text

text

Reverse the characters of text

text

Convert RGB values to hexadecimal color

color

Build robots.txt for search engine crawlers

web reference

Apply ROT13 Caesar cipher shift

encoding

Full-featured calculator with trig, logs, and more

numbers

Produce 160-bit SHA-1 hash of input

hashing

Convert string to URL-friendly slug

text

Convert text to snake_case

text

Sort lines alphabetically, numerically, or by length

text

Beautify SQL with keyword casing and indentation

formatters

Convert SQL results or INSERT statements to JSON

converters

Strip whitespace and comments from SVG

image

Remove redundant metadata and shrink SVG files

image

Convert between Celsius, Fahrenheit, and Kelvin

numbers

Compare two texts and highlight differences

text

Get ASCII codes for each character

encoding

Encode text as 8-bit binary representation

encoding

Convert a date to relative time like '3 days ago'

datetime

Convert time between different time zones

datetime

Clean up and validate TOML config files

formatters

Convert tab-separated to comma-separated values

converters

Convert between Unicode characters and \u escapes

encoding

Parse user agent strings to identify browser and OS

web reference

Convert between liters, gallons, milliliters, and more

numbers

Convert between grams, pounds, ounces, and more

numbers

Count words in a block of text

text

Pretty-print XML with proper indentation

formatters

Remove whitespace and comments from XML

formatters

Parse XML and output equivalent JSON

converters

Verify XML is well-formed

formatters