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About DevPane

A collection of essential developer tools, built with care.

What is DevPane?

DevPane is a growing suite of developer utilities designed to solve common problems quickly and elegantly. Every tool runs entirely in your browser, with no servers collecting your data, no signup walls, and no artificial limits. Whether you need to decode a JWT, convert a Unix timestamp, or analyze a domain's DNS records, DevPane gives you the answer in seconds.

Each tool is meticulously designed to do one thing exceptionally well. We believe developer tools should be fast, transparent, and respectful of your privacy. That means client-side execution wherever possible, clean interfaces without clutter, and thoughtful features like URL state sharing, keyboard shortcuts, and dark mode by default.

DevPane is also a demonstration of quality over quantity. Rather than building mediocre utilities, we focus on carefully crafted tools that developers actually use daily. Each tool includes educational content, real-world examples, and best practices guides to help you understand not just how to use the tool, but why certain patterns and standards exist in the first place.

The Tools

Calculate

  • Epoch Converter

    Convert Unix timestamps to human-readable dates and vice versa

  • Cron Builder

    Visual cron expression builder with natural language

  • Subnet Calculator

    Calculate subnets, plan VPCs, and detect overlapping CIDRs

  • Color Converter

    Convert colors between HEX, RGB, HSL, OKLCH with contrast checker

  • chmod Calculator

    Calculate Unix file permissions with interactive grid and umask

Encode & Decode

  • Base64 Encoder

    Encode and decode Base64 with file, URL-safe, and bulk modes

  • URL Encoder

    Encode, decode, and parse URLs with query string builder

  • HTML Entities

    Encode and decode HTML entities with XSS prevention and Unicode explorer

Format & Validate

  • JSON Formatter

    Format, validate, and beautify JSON data

  • YAML Validator

    Validate, format, and convert YAML with Kubernetes and GitHub Actions awareness

  • SQL Formatter

    Format and beautify SQL with multi-dialect support and query analysis

  • Markdown Preview

    Live Markdown editor with GFM support, HTML export, and table generator

  • Mermaid Diagram Renderer

    Write Mermaid code, see live diagrams — flowcharts, sequences, ER, and more

  • ASCII to SVG

    Turn ASCII art diagrams into beautiful SVG and PNG images

Inspect & Analyze

  • JWT Decoder

    Decode and inspect JSON Web Tokens

  • Regex Tester

    Test regular expressions with live matching and plain-English explanations

  • Diff Checker

    Compare text and code with syntax-aware side-by-side diff

  • HTTP Status Codes

    Interactive HTTP status code explorer with decision tree

Generate

Lookup

Built by Bluminal Labs

DevPane is built and maintained by Bluminal Labs, a software consultancy focused on developer tools, technical infrastructure, and web performance optimization.

Our Philosophy

  • Privacy by default: Most tools run 100% in your browser. Your data never leaves your machine.
  • Performance matters: Instant feedback, no loading spinners, no artificial delays.
  • Education over automation: Every tool includes guides explaining the underlying concepts and best practices.
  • Open and honest: We show our work. Source code, reasoning, and limitations are documented clearly.
  • No dark patterns: No signup walls, no artificial feature locks, no misleading language. The site is supported by ethical advertising, not user tracking.

Get in Touch

Have feedback, questions, or partnership inquiries? Reach out at hello@bluminal.com.