Developer Tools
31 toolsFormatters, encoders, converters and utilities for developers and engineers.
Format messy JSON, decode JWT tokens, test regex patterns, convert between CSV and JSON, build cron schedules, and much more — without installing anything or creating an account. Every tool works instantly in your browser, so your source code and data stay on your machine. Perfect for quick tasks during development when you just need a result, not another app to download.
Formatters & Validators
Free JSON Formatter & Validator for Easy Analysis | MultiTools
Format and validate JSON effortlessly for better readability and error-free data. 100% private, no u...
Free Regex Tester Online — Test & Debug Instantly | MultiTools
Test and debug regex patterns instantly online. Get real-time feedback, full privacy, and no data up...
Free SQL Formatter Online
Format SQL queries instantly for better readability and debugging. Enhance team collaboration and ma...
Free Text Diff Checker Online — Compare Text Securely | MultiTools
Compare text files instantly with ease. Highlight differences, maintain privacy, and enjoy fast resu...
Beautify & Minify HTML/CSS/JS Online for Free | MultiTools
Format or compress your HTML, CSS, JS code instantly for clarity or speed. 100% online, secure, and ...
Free Markdown Preview Online
Edit and preview Markdown in real-time with zero uploads. Perfect for bloggers and developers. Fast,...
.env File Cleaner Online
Organize and sanitize .env files effortlessly. Ensure privacy with no uploads. Free and efficient, k...
Free XML Formatter & Validator Online — 100% Private | MultiTools
Format and validate XML instantly with our free online tool. Gain clarity and accuracy in your XML f...
Free Online Log Viewer & Analyzer — Secure & Fast | MultiTools
Quickly analyze and filter log files with regex search. Color-coded levels for easy readability. Fre...
Free JSON Schema Validator Online — Ensure Data Accuracy | MultiTools
Validate JSON data against schemas instantly and privately. Improve data integrity and streamline pr...
Create Diagrams Online Free — Easy Mermaid Visualizer | MultiTools
Create diagrams online with ease using free templates. Export as SVG/PNG. No sign-up required, your ...
Encoders & Decoders
Base64 Encoder & Decoder Online Free — Secure & Fast | MultiTools
Encode or decode Base64 strings quickly for seamless data transfer. Compatible with text and files. ...
Free URL Encoder & Decoder Online for Safe URLs | MultiTools
Convert URLs safely and easily with our free online encoder/decoder. Perfect for developers, 100% pr...
Decode JWT Tokens Securely Online | Free Tool | MultiTools
Decode JWT tokens instantly, inspect headers & payloads with full privacy. No data leaves your brows...
Converters
Convert Unix Timestamps to Dates Online, Free & Private | MultiTools
Easily convert Unix timestamps to human-readable dates with zero data upload. Enjoy fast, accurate r...
Convert JSON to Cartoons Online for Free | MultiTools
Transform JSON data into engaging cartoons instantly. Visualize and simplify complex data. 100% priv...
Convert CSV to JSON Online Free — Instant & Private | MultiTools
Convert CSV files to JSON format instantly and securely. Enjoy user-friendly features with full priv...
Convert YAML to JSON Free Online — Secure & Fast | MultiTools
Easily convert YAML to JSON with instant, secure results. No data uploads, fully private, and access...
Free Number Base Converter — Binary, Hex, Decimal | MultiTools
Convert numbers between binary, octal, decimal, and hex with ease. Fast, private, and no data upload...
Convert cURL to Fetch or Axios Online Free | MultiTools
Easily convert cURL commands to Fetch or Axios for seamless API integration. Fast, free, and secure ...
Free CSV Data Profiler Online
Analyze CSV files quickly to improve data quality. Get instant insights with no uploads and complete...
AI & LLM
Online Token Cost Estimator for AI API Budgets | MultiTools
Estimate AI API token costs easily and plan budgets effectively. Enjoy instant results with no data ...
AI Token Counter for ChatGPT, GPT-4 & Claude — Free | MultiTools
Count tokens for GPT-4, ChatGPT, Claude & Llama instantly. Estimate API costs, check context limits....
LLM API Pricing Comparison Calculator | Free Online Tool
Compare costs of GPT-5, Claude Opus, and Gemini per token with our free LLM API pricing calculator t...
AI Prompt Builder & Template Generator | Free Online Tool
Create and format effective AI prompts for Midjourney and ChatGPT with our free online tool. Easy to...
EU AI Act Risk Classification Checker | Free Online Tool
Evaluate your AI application's compliance with the EU AI Act using our Risk Classification Checker. ...
SEO & Web
Free Meta Tag Generator for SEO & Social Media | MultiTools
Generate SEO-friendly meta tags, Open Graph, and Twitter Cards instantly. Enhance visibility with ou...
Generate Robots.txt & Sitemap Online Fast & Free | MultiTools
Generate robots.txt and sitemap.xml in seconds to boost your SEO. 100% private, no signup needed. En...
Privacy Policy Generator
Generate a free custom GDPR and CCPA compliant privacy policy for your website or app instantly. No ...
Other
Generate Secure UUIDs Online — Free & Private | MultiTools
Generate secure UUID v4 identifiers instantly for unique ID needs. Free, no signup, 100% private wit...
Build and Test Cron Expressions Online Free | MultiTools
Effortlessly create and test cron expressions for scheduling tasks. Secure, private, and no signup r...
Cut Your Business Costs
Automate your business processes and reduce operational costs with tailored digital solutions.
Subcategories
- Formatters & Validators 11
- Encoders & Decoders 3
- Converters 7
- AI & LLM 5
- SEO & Web 3