Developer Tools
Color converters, encoders, generators, and utilities for developers.
Browse all 34 tools in Developer Tools. Each tool runs entirely in your browser with no account required.
Color Converter
Convert colors between HEX, RGB, HSL, and CMYK formats. Includes a color picker and palette generator.
Use tool →Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings instantly. Supports UTF-8 and file encoding.
Use tool →QR Code Generator
Generate QR codes for URLs, text, Wi-Fi, email, and more. Download as PNG or SVG.
Use tool →Word & Character Counter
Count words, characters, sentences, and paragraphs. Estimate reading time and speaking time.
Use tool →Password Generator
Generate strong, random passwords with customizable length, symbols, numbers, and strength indicator.
Use tool →HTML Entity Encoder/Decoder
Encode special characters to HTML entities or decode entities back to readable text.
Use tool →JSON Formatter
Format, validate, and minify JSON with syntax highlighting and instant error detection.
Use tool →Regex Tester
Test regular expressions in real time with match highlighting, flags, and capture group inspection.
Use tool →URL Encoder/Decoder
Encode and decode URL strings for safe query parameters, path segments, and web debugging.
Use tool →Unix Timestamp Converter
Convert Unix timestamps to human-readable date/time and convert dates back to epoch format.
Use tool →Lorem Ipsum Generator
Generate placeholder text by paragraph, sentence, or word count for mockups and content drafts.
Use tool →JWT Decoder
Decode JWT headers and payloads, inspect claims, and quickly check token expiry timestamps.
Use tool →UUID Generator
Generate secure UUID v4 values in bulk with formatting options for braces, hyphens, and uppercase output.
Use tool →Cron Expression Parser
Validate cron syntax and preview upcoming run times in UTC to debug schedules before deployment.
Use tool →HTTP Status Code Lookup
Look up HTTP status codes and meanings fast to troubleshoot API responses and integration issues.
Use tool →cURL Command Generator
Build cURL commands with headers, auth, query params, and body payloads for reliable API testing.
Use tool →SQL Query Formatter
Format messy SQL into readable clauses, normalize keyword casing, and produce compact minified queries.
Use tool →JSON Schema Generator
Generate JSON Schema from sample payloads for validation rules, contracts, and structured AI outputs.
Use tool →Prompt Template Studio
Create reusable AI prompt templates with variables and export rendered message JSON for LLM APIs.
Use tool →Prompt Variant Generator
Generate multiple high-quality prompt rewrites from one base instruction to improve reliability, structure, and output style.
Use tool →Prompt A/B Test Workbench
Compare two prompts side by side with token and clarity heuristics to pick a stronger baseline before deployment.
Use tool →AI Output Evaluator
Score model responses for relevance, structure quality, and risk signals to quickly diagnose weak output patterns.
Use tool →JSON Output Repair Tool
Repair common malformed JSON issues from AI outputs and return valid formatted JSON for downstream workflows.
Use tool →Prompt Injection Checker
Detect common prompt-injection and instruction-override patterns in untrusted text before sending it to an LLM.
Use tool →Prompt Compression Tool
Compress verbose prompts into tighter instructions while preserving intent and reducing estimated token usage.
Use tool →Image Palette Extractor
Extract dominant color swatches from uploaded images for branding systems, UI kits, and social creative workflows.
Use tool →WCAG Contrast Checker
Calculate contrast ratio between foreground and background colors with AA/AAA pass-fail checks for accessible UI text.
Use tool →CSS Gradient Generator
Generate linear gradient CSS with angle and multi-color stops, including live preview and copy-ready code output.
Use tool →SVG Optimizer
Minify SVG markup by stripping comments and extra whitespace to reduce payload size for web delivery.
Use tool →Image Color Picker
Click any pixel in an uploaded image to inspect and copy exact HEX color values for design and frontend work.
Use tool →Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files. All hashing runs locally in your browser.
Use tool →Diff Checker
Compare two blocks of text side by side and see added, removed, and unchanged lines instantly.
Use tool →Chmod Calculator
Calculate Unix file permissions with an interactive checkbox matrix. Convert between octal and symbolic notation.
Use tool →CSS Flexbox Generator
Build flexbox layouts visually with a live preview. Adjust direction, wrapping, alignment, and gap, then copy the CSS.
Use tool →Topic Hubs for Developer Tools
Follow hub playbooks to chain related tools and complete larger workflows.