Developer utilities & AI tools that just work

In-browser developer utilities, JSON formatters, text cleaners, and AI prompt engineering tools. 16 high-speed utilities, 100% private, no signup.

Featured Tools

Our most popular utilities for developers and prompt engineers

Epoch Converter & Unix Timestamp Studio Convert Unix epoch timestamps to human dates with live clock, relative math, timezone matrix, and batch log inliner. Prompt Formatter Structure AI prompts with Claude XML, OpenAI Markdown, Few-Shot blocks, and API JSON. Prompt Token Counter Count AI tokens, visualize subword slices, and estimate API costs across GPT-4o, Claude & Gemini. Prompt Privacy Checker Detect, mask, and redact API secrets, personal PII, and credentials before sending prompts. Prompt Expander Expand one-line ideas into production-ready system prompts across 7 domains and 5 frameworks. Prompt Compressor Shrink prompts, prune conversational fluff, and cut API token costs by up to 35%. Prompt Linter Static analysis and automated quality diagnostics across 5 core prompt engineering pillars. Prompt Complexity Score Cognitive load analysis, readability indexing, and intelligent LLM model routing. Invisible Character Detector Detect, highlight in-text, decode steganography, and sanitize 35+ hidden Unicode characters. JSON Extractor Extract, inspect, tree-view, and semantically diff JSON from messy text, logs, and AI outputs.

Browse by Category

Prompt Engineering

10 tools

Format, analyze and optimize prompts for ChatGPT, Claude and other AI models.

Text Processing

3 tools

Clean, normalize and inspect any text in seconds.

Markdown

1 tool

Convert and clean Markdown content.

Developer

2 tools

Utilities for working with structured data and code.

All Tools

Text Processing

Text Cleaner Format cases, sort lines, strip HTML/Markdown/emojis, and filter text. Invisible Character Detector Detect, highlight in-text, decode steganography, and sanitize 35+ hidden Unicode characters. Copy/Paste Cleaner Fix smart quotes, weird bullets and hidden junk from pasted text.
The DevForge Advantage

Why developers choose DevForge

DevForge is a fast, free, in-browser developer utility platform built for modern engineers, technical writers, and AI practitioners. Whether you are inspecting JSON trees, converting timestamps, measuring prompt token limits, or sanitizing copy-paste text, DevForge delivers precision tools with zero installation and zero bloat.

🛡️

100% Client-Side Privacy

Everything runs locally in your browser sandbox using Web APIs and JavaScript. Your code, API keys, JSON payloads, and system prompts never touch an external server.

⚡

Zero-Latency Execution

Instant token counts, AST diff calculations, JSON syntax formatting, and regex replacements happen in sub-milliseconds without network roundtrips.

🛠️

Full LLM & Dev Lifecycle

From expanding ideas with Prompt Expander to linting with Prompt Linter and optimizing with Compressor.

Frequently asked questions

Everything you need to know about DevForge, privacy, and how our in-browser developer utilities work.

Frequently asked questions

Are these developer and AI tools really free?

Yes. Every tool on DevForge is completely free to use, with no signup, no account and no usage limits.

Is my data or code uploaded to a server?

No. All tools run entirely in your browser using client-side JavaScript. Your data, code, timestamps, and prompts never leave your device.

Which technologies and AI models are supported?

DevForge is built for all developers. It supports standard JSON, code schemas, Markdown, regex, timestamps, and AI models including ChatGPT, Claude, Gemini, and Llama.

Do I need to install anything?

No. Everything works directly in your browser on desktop and mobile, with full dark mode and keyboard shortcuts.

How often are new tools added?

Regularly. DevForge is actively growing to house in-browser compilers, time utilities, data converters, and next-gen AI developer tools.

From the Blog

Developer guides, prompt architectures, and AI techniques

All posts →

Jul 1, 2026

How to Write Better Prompts: 7 Rules That Actually Work

Seven practical, model-agnostic rules for writing better AI prompts, with before-and-after examples you can apply today.

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Jun 20, 2026

Prompt Engineering Guide: From Basics to Production

A practical prompt engineering guide covering structure, iteration, token budgets, testing and versioning for production AI applications.

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Jun 5, 2026

ChatGPT Prompts: Patterns and Examples That Get Better Answers

Proven ChatGPT prompt patterns with copy-ready examples for writing, coding, analysis and learning, plus mistakes to avoid.

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