Developer Tools
Free online developer tools. Format, encode, generate, convert and process data right in your browser.
.gitignore Generator
Free .gitignore generator for 50+ languages and frameworks. Build a .gitignore file for Node.js, Python, Java, Go, Rust …
AI Cost Calculator
Free online AI cost calculator. Estimate API costs for GPT-5, Claude, Gemini, Llama 4, and DeepSeek. Compare token …
AI Model Comparison Table
Free interactive AI model comparison table. Compare context windows, pricing, benchmarks, and speeds across GPT-5, …
AI Token Counter
Free online AI token counter. Estimate token counts for GPT-5, Claude, Gemini, Llama and more. Calculate API costs …
Base64 Decode
Free online Base64 decoder. Convert Base64 strings back to text instantly in your browser. Supports UTF-8.
Base64 Encode
Free online Base64 encoder. Convert text to Base64 format instantly in your browser. Supports UTF-8 characters.
Base64 Encode / Decode
Free online Base64 encoder and decoder. Convert text to Base64 and back instantly in your browser. Supports UTF-8.
Case Converter
Free online case converter. Instantly convert text to camelCase, snake_case, PascalCase, kebab-case, CONSTANT_CASE, …
chmod Calculator
Free online chmod calculator. Convert between numeric and symbolic Unix file permissions instantly in your browser. No …
Chunking Preview Tool
Free online text chunking tool for RAG pipelines. Split text by tokens, sentences, or paragraphs with overlap. Visualize …
Claude Opus 4.6 Pricing Calculator
Calculate Claude Opus 4.6 API costs instantly. See per-token pricing for input and output, compare with other models, …
Claude Opus 4.6 vs DeepSeek V3 — AI Model Comparison
Compare Claude Opus 4.6 and DeepSeek V3 side by side. Is the premium model worth 55x the price? Benchmarks, use cases, …
Claude Opus 4.6 vs Gemini 3 — AI Model Comparison
Compare Claude Opus 4.6 and Gemini 3 side by side. Context windows, pricing, benchmarks, and strengths for each model.
Claude Token Counter
Free online Claude token counter. Estimate tokens for Claude Opus 4.6, Sonnet 4.6, and Haiku 4.5, then calculate …
Color Converter
Free online color converter. Convert between HEX, RGB, HSL color formats instantly. Visual color picker and palette …
Cron Expression Builder
Free online cron expression builder. Generate and understand cron schedules visually. Human-readable descriptions …
CSS Beautifier / Minifier
Free online CSS beautifier and minifier. Format and compress CSS code instantly in your browser. No signup, no …
CSV to JSON Converter
Free online CSV to JSON converter. Transform CSV data to JSON format instantly in your browser.
DeepSeek V3 Pricing Calculator
Calculate DeepSeek V3 API costs instantly. One of the cheapest capable LLMs available — see per-token pricing and …
Diff Checker
Free online diff checker. Compare two texts side by side with highlighted differences. Find changes between code …
Favicon Generator
Free online favicon generator. Create favicons from text or emoji instantly in your browser. Download in multiple sizes. …
Gemini 3 Pricing Calculator
Calculate Gemini 3 API costs instantly. Estimate Google AI pricing per token, compare with Gemini 2.5 Pro and Flash, and …
Gemini Token Counter
Free online Gemini token counter. Estimate token counts for Gemini 3, Gemini 2.5 Pro, and Gemini 2.5 Flash. Calculate …
GPT-5 Pricing Calculator
Free GPT-5 pricing calculator. Estimate API costs per token for GPT-5.4, compare with GPT-4o and Claude, and calculate …
GPT-5.4 vs Claude Opus 4.6 — AI Model Comparison
Compare GPT-5.4 and Claude Opus 4.6 side by side. Benchmarks, pricing, context windows, and use cases for the two …
GPT-5.4 vs Gemini 3 — AI Model Comparison
Compare GPT-5.4 and Gemini 3 head to head. Pricing, context windows, benchmarks, and use cases for OpenAI and Google's …
GPT-5.4 vs Mistral Large 3 — AI Model Comparison
Compare GPT-5.4 and Mistral Large 3 head to head. Benchmarks, pricing, context windows, and when to choose each model.
Hash Generator
Free online hash generator. Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly in your browser. No data sent to …
HEX to RGB Converter
Free online HEX to RGB converter. Convert hexadecimal color codes to RGB values instantly in your browser.
HTML Beautifier / Minifier
Free online HTML beautifier and minifier. Format, beautify and minify HTML code instantly in your browser. No signup, no …
HTML Entity Encode/Decode
Free online HTML entity encoder and decoder. Convert special characters to HTML entities and back instantly in your …
HTML to Markdown Converter
Free online HTML to Markdown converter. Convert HTML code to clean Markdown syntax instantly in your browser. No signup, …
JavaScript Beautifier / Minifier
Free online JavaScript beautifier and minifier. Format and compress JS code instantly in your browser. No signup, no …
JSON Formatter & Validator
Free online JSON formatter and validator. Beautify, minify and validate JSON instantly in your browser. No signup …
JSON Schema Generator for Function Calling
Free online JSON schema generator for AI function calling. Build tool schemas for OpenAI and Claude APIs with a visual …
JSON to CSV Converter
Free online JSON to CSV converter. Convert JSON arrays to CSV and CSV to JSON instantly in your browser.
JSON to CSV Converter
Free online JSON to CSV converter. Transform JSON arrays to CSV format instantly in your browser.
JSON to YAML Converter
Free online JSON to YAML converter. Transform JSON data to YAML format instantly in your browser.
JSON to YAML Converter
Free online JSON to YAML converter. Convert between JSON and YAML formats instantly in your browser. No signup required.
JWT Decoder
Free online JWT decoder. Decode and inspect JSON Web Token header and payload instantly. Check expiration and claims.
JWT Generator
Free online JWT generator. Sign JSON Web Tokens with HS256, HS384 or HS512 in your browser. Add custom claims, set …
Llama 4 Pricing Calculator
Free Llama 4 pricing calculator. Compare Maverick API costs across providers, estimate self-hosting spend, and see how …
Llama 4 vs GPT-5.4 — AI Model Comparison
Compare Llama 4 Maverick and GPT-5.4 side by side. Benchmarks, pricing, context windows, and self-hosting vs API …
Llama Token Counter
Free online Llama token counter. Estimate token counts for Llama 4 Maverick and other Meta models. Plan your self-hosted …
Lorem Ipsum Generator
Free online Lorem Ipsum generator. Generate placeholder text paragraphs, sentences, or words instantly. HTML output …
Markdown to HTML Converter
Free online Markdown to HTML converter. Convert Markdown syntax to HTML code instantly in your browser with live …
MD5 Hash Generator
Free online MD5 hash generator. Generate MD5 checksums from text instantly in your browser. No data sent to any server.
Meta Tags Generator
Free online meta tags generator. Create HTML meta tags, Open Graph tags, and Twitter Card tags instantly. No signup, no …
Mistral Token Counter
Free online Mistral token counter. Estimate token counts for Mistral Large 3 and other Mistral models. Calculate API …
Morse Code Translator
Free online Morse code translator. Convert text to Morse code and Morse code to text instantly in your browser. No …
Number Base Converter
Free online number base converter. Convert between binary, octal, decimal, and hexadecimal instantly in your browser.
OpenAI Token Counter
Free online OpenAI token counter. Estimate token counts for GPT-5.4, GPT-4o, and GPT-4o Mini. Calculate API costs …
Password Generator
Free online password generator. Create strong, random passwords instantly in your browser. Customizable length and …
Prompt Diff / A/B Viewer
Free online prompt diff tool. Compare two prompts side by side with highlighted differences. Track prompt iterations and …
Prompt Template Library
Free curated prompt templates for developers. Copy-paste prompts for coding, debugging, writing, analysis, and more. …
QR Code Generator
Free online QR code generator. Create QR codes for URLs, text, WiFi, and more instantly in your browser. No signup, no …
Regex Tester
Free online regex tester. Test regular expressions with real-time match highlighting. Supports JavaScript regex flags.
RGB to HEX Converter
Free online RGB to HEX converter. Convert RGB color values to hexadecimal color codes instantly in your browser.
robots.txt Generator
Free online robots.txt generator. Build and customize your robots.txt file instantly in your browser. No signup, no …
SHA-1 Hash Generator
Free online SHA-1 hash generator. Generate SHA-1 hashes from text instantly in your browser.
SHA-256 Hash Generator
Free online SHA-256 hash generator. Generate secure SHA-256 hashes from text instantly in your browser.
SQL Formatter
Free online SQL formatter. Beautify and format SQL queries instantly in your browser. No signup required.
Structured Output Tester
Free online structured output tester. Validate JSON schemas, generate example responses, and create TypeScript types for …
System Prompt Builder
Free online system prompt builder. Create structured system prompts for ChatGPT, Claude, and other LLMs with a visual …
Text Similarity Analyzer
Free online text similarity analyzer. Compare two texts using TF-IDF and cosine similarity. Visualize shared terms and …
Unicode Escape/Unescape
Free online Unicode escape and unescape tool. Convert text to \uXXXX escape sequences and back instantly in your …
Unix Timestamp Converter
Free online Unix timestamp converter. Convert timestamps to human-readable dates and back. Supports seconds and …
URL Decode
Free online URL decoder. Decode percent-encoded URLs back to readable text instantly in your browser.
URL Encode
Free online URL encoder. Percent-encode text for safe use in URLs instantly in your browser.
URL Encode / Decode
Free online URL encoder and decoder. Percent-encode special characters and decode %20, %2F, %3D, and Unicode in your …
UUID Generator
Free online UUID generator. Generate random UUIDs (v4) instantly in your browser. Bulk generation, uppercase/lowercase …
Word & Character Counter
Free online word and character counter. Count words, characters, sentences, and paragraphs instantly. Reading time …
XML Formatter & Validator
Free online XML formatter and validator. Beautify and validate XML instantly in your browser. No signup, no …
YAML to JSON Converter
Free online YAML to JSON converter. Transform YAML data to JSON format instantly in your browser.
YAML to TOML Converter
Free online YAML to TOML converter. Convert between YAML and TOML formats instantly in your browser. No signup, no …
YAML Validator
Free online YAML validator and syntax checker. Validate YAML files instantly in your browser — Kubernetes manifests, …