Fast, free online tools

Prompt Template Generator

Build structured prompts with system, user, and assistant messages

Token Cost Estimator

Estimate LLM API costs by model, input tokens, and output tokens

GPT Tokenizer

Count tokens for OpenAI, Anthropic, and other LLM models

JSON to Function Calling Schema

Convert JSON objects into OpenAI and Anthropic function calling schemas

SVG to PNG

Convert SVG files to PNG images with custom dimensions

Image to Base64

Encode images to Base64 strings for embedding

Base64 to Image

Decode Base64 strings back into downloadable images

Image Compressor

Compress images to reduce file size

Placeholder Image Generator

Generate placeholder images with custom size, color, and text

Image Compare Slider

Compare two images side by side with an interactive slider

Image Resizer

Resize images to exact pixel dimensions in the browser

Favicon Generator

Generate favicons and app icons from any image

Image Cropper

Crop images to exact dimensions with a visual selection tool

Image Watermark

Add text or image watermarks to photos with customizable options

EXIF Reader

View and extract EXIF metadata from images

EXIF Data Remover

Strip metadata from images for privacy protection

PNG/JPG to WebP

Convert PNG and JPG images to WebP format

SVG to ICO Converter

Convert SVG files to ICO format with multiple sizes

PNG/JPG to ICO Converter

Convert PNG and JPG images to ICO format with multiple sizes

Case Converter

Convert text between camelCase, snake_case, kebab-case, and more

Word Counter

Count words, characters, sentences, and paragraphs

Slug Generator

Convert text into URL-friendly slugs

Text Diff Checker

Compare two texts and highlight differences

String Escape/Unescape

Escape and unescape strings for different contexts

Reading Time Estimator

Estimate reading and speaking time for any text

Lorem Ipsum Generator

Generate placeholder text for design and development

Typing Speed Test

Test your typing speed and accuracy in words per minute

Roman Numeral Converter

Convert between Roman numerals and decimal numbers

Morse Code Converter

Convert text to Morse code and Morse code to text

NATO Alphabet Converter

Convert text to NATO phonetic alphabet and back

Sort Lines Alphabetically

Sort text lines alphabetically with multiple options

Word Frequency Counter

Analyze text to find the most used words and their frequency

Remove Duplicate Lines

Remove duplicate lines from text instantly

Link Extractor

Extract all URLs from text with one click

HTML to Text Converter

Strip HTML tags and extract plain text from markup

HEX to RGB

Convert colors between HEX, RGB, and HSL formats

Color Palette Generator

Generate harmonious color palettes from a base color

Contrast Checker

Check color contrast for WCAG accessibility

Color Shades Generator

Generate light-to-dark shade palette from any base color

Average Color Calculator

Calculate the average of multiple colors

Color Blender

Mix two colors together with adjustable ratio

Base64 Encode/Decode

Encode text to Base64 or decode Base64 to text

URL Encode/Decode

Encode or decode URL components

JWT Decoder

Decode and inspect JSON Web Tokens

Markdown to HTML

Convert Markdown to HTML with live preview

Base/Radix Converter

Convert numbers between binary, octal, decimal, hex, and custom bases

Punycode Converter

Encode and decode internationalized domain names

Hex/ASCII Converter

Convert between hexadecimal and ASCII text

HTML Entity Encode/Decode

Encode or decode HTML entities

px to rem

Convert pixel values to rem units and vice versa

Gradient Generator

Create CSS linear and radial gradients visually

Box Shadow Generator

Create CSS box shadows with live preview

Fluid Typography Calculator

Generate CSS clamp() values for responsive typography

CSS Cursor Preview

Preview all CSS cursor values visually

CSS Filter Generator

Build CSS filter effects visually with sliders

Glassmorphism Generator

Create frosted glass CSS effects with live preview

Border Radius Previewer

Preview and generate CSS border-radius values

JSON Formatter

Format, validate, and minify JSON data

JSON to CSV

Convert JSON arrays to CSV format

JSON Validator

Validate JSON with detailed error messages

JSON Diff

Compare two JSON objects and highlight structural differences

JSON Key Sorter

Sort JSON object keys alphabetically

SQL Formatter

Format and beautify SQL queries for any dialect

CSV to JSON

Convert CSV data to JSON array format

UUID Generator

Generate random UUIDs (v4) instantly

Hash Generator

Generate SHA-1, SHA-256, and SHA-512 hashes

Timestamp Converter

Convert between Unix timestamps and human-readable dates

Regex Tester

Test and debug regular expressions with live matching

QR Code Generator

Generate QR codes from text, URLs, or any data

.gitignore Generator

Generate .gitignore files for any tech stack

Cron Expression Parser

Parse and explain cron expressions in human-readable format

Chmod Calculator

Calculate file permissions in numeric and symbolic notation

ULID Generator

Generate ULIDs — sortable unique identifiers

URL Parser

Parse URLs into protocol, host, path, query, and hash

Algorithm Visualizer

Visualize sorting and searching algorithms step by step

Robots.txt Validator

Validate and analyze robots.txt files for syntax errors and SEO issues

Deep Link Generator

Generate iOS Universal Links, Android App Links, and custom URI scheme deep links

JSON to TypeScript

Generate TypeScript interfaces from JSON data

cURL to Fetch

Convert cURL commands to JavaScript fetch or axios code

JSON to PHP

Convert JSON data to PHP array syntax

HTML to JSX

Convert HTML markup to JSX for React components

JSON to Python Dataclass

Generate Python dataclasses from JSON data

JSON to YAML

Convert JSON data to YAML format

JSON to Zod Schema

Generate Zod validation schemas from JSON

Percentage Calculator

Calculate percentages, increases, and decreases

Unit Converter

Convert between common units of measurement

Aspect Ratio Calculator

Calculate and convert aspect ratios from pixel dimensions

DPI Calculator

Calculate screen PPI and print resolution

Discount Calculator

Calculate sale price and savings from a discount percentage

Password Generator

Generate secure random passwords with customizable options

CSP Header Builder

Build Content Security Policy headers visually

HMAC Generator

Generate HMAC signatures with SHA-256 and SHA-512

JWT Secret Key Generator

Generate cryptographically secure secret keys for JWT signing

Date Difference Calculator

Calculate the difference between two dates

Age Calculator

Calculate exact age from birth date

Countdown Timer

Set a countdown timer or use a stopwatch with lap times

Timezone Converter

Convert time between cities and timezones worldwide

Pomodoro Tracker

Focus timer with work/break cycles and session tracking

Eisenhower Matrix

Prioritize tasks by urgency and importance with a visual matrix

UTM Link Builder

Build UTM-tagged URLs for campaign tracking

Hreflang Tag Generator

Generate hreflang link tags for multilingual SEO

Sitemap XML Generator

Generate sitemap.xml files for search engine indexing

Open Graph Preview

Preview how your page looks when shared on social media

JSON-LD Generator

Generate JSON-LD structured data for Schema.org SEO

Meta Tag Generator

Generate HTML meta tags for SEO and social sharing

HTTP Status Code Reference

Searchable reference of all HTTP status codes

Download Time Calculator

Estimate download time based on connection speed

IP Address Parser

Parse and validate IPv4 and IPv6 addresses

IBAN Validator

Validate and parse IBAN numbers with country and bank details

HTTP Header Explainer

Look up and understand HTTP request and response headers

Subnet Calculator

Calculate IP subnets, ranges, and CIDR notation

Google Fonts CSS Snippet

Generate CSS snippets for Google Fonts

Font-face Declaration Generator

Generate @font-face CSS declarations for custom web fonts

Font Pair Previewer

Preview font combinations for headings and body text

Blob/Wave Shape Generator

Generate organic blob and wave shapes as SVG

SVG Optimizer

Optimize and minify SVG code to reduce file size

SVG to Data URI

Convert SVG code to a CSS-ready data URI string

ARIA Attribute Reference

Searchable reference of all ARIA roles and attributes

Color Blindness Simulator

Simulate how colors appear with different types of color vision deficiency

SRT/WebVTT Converter

Convert between SRT and WebVTT subtitle formats

Video Embed Generator

Generate responsive embed code for YouTube and Vimeo videos