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Free Online Developer Tools

65+ developer utilities. 100% browser-based. Zero data sent anywhere.

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JSON Formatter

Format, validate & minify JSON

Base64 Encoder/Decoder

Encode & decode Base64 strings

UUID Generator

Generate UUID v4 identifiers

Browse Tools by Category

Formatters

12 tools

• JSON Formatter
• JSON Validator
• JSON Diff

Converters

11 tools

• JSON to TypeScript
• YAML ↔ JSON Converter
• XML ↔ JSON Converter

Generators

6 tools

• UUID Generator
• QR Code Generator
• Lorem Ipsum Generator

Text Tools

5 tools

• Regex Tester
• Text Diff Checker
• Word & Character Counter

Encoders & Decoders

7 tools

• Base64 Encoder/Decoder
• Base32 Encoder/Decoder
• URL Encoder/Decoder

Security & Hashing

11 tools

• Hash Generator
• SHA256 Generator
• MD5 Generator

AI Tools

3 tools

• AI Detector
• AI Token Counter
• LLM Pricing Comparison

Date & Time

4 tools

• Timestamp Converter
• Timezone Converter
• Date Calculator

Calculators

4 tools

• Percentage Calculator
• Unit Converter
• Aspect Ratio Calculator

Color & Design

3 tools

• Color Converter
• Color Contrast Checker
• Color Palette Generator

Developer Utilities

9 tools

• HTML/JS Playground
• Cron Expression Builder
• HTTP Header Viewer

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Stop Cursor From Breaking Your Working Code: The Tunnel Vision Problem

AI coding assistants like Cursor can fix one bug while introducing three more because they can't see your whole codebase. Here's how to prevent Claude from breaking working code when you're just trying to fix one thing.

Feb 15, 2026·8 read

How Claude Actually Remembers: Projects, Memory, and Context That Survives

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