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Free Developer Tools for Builders, Writers, and Makers

Simple, practical tools for coding, SEO, technical writing, AI workflows, image utilities, API testing, and everyday developer tasks.

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File & Export

QR Code & Barcode Generator

Generate customizable QR codes with colors, logos, and download options

CSV to Excel

Convert CSV files to Excel format (XLSX or XLS) with auto-sized columns

Markdown to Word

Convert Markdown (.md) files to Word documents (.docx) with formatting

Vector Embeddings Formatter

Format vector embeddings into JSON, Python, SQL (pgvector), Pinecone, or MongoDB syntax

SQL to ERD

Parse a .sql file into an interactive ER diagram with tables, keys and relations

Odoo Module Generator

Scaffold a standards-compliant Odoo 18 module (model, views, security, menus) with optional Vietnamese i18n — download as .zip

Text & String

Text Utilities

Transform, organize, format, and clean text with powerful utilities

Hash Generator

Generate MD5, SHA-1, SHA-256, and other cryptographic hashes

Color Picker

Advanced color picker with HEX, RGB, HSL, and palette generation

Image

Image to Base64

Convert images to Base64 format for embedding in HTML, CSS, or data URIs

Image Resizer

Resize images while maintaining aspect ratio. Perfect for logos and thumbnails

Image Cropper

Crop images with custom sizes and shapes. Supports multiple aspect ratios

Network & API

API Tester

Send HTTP requests and inspect responses directly in your browser

Firebase Notification Tester

Send test FCM push notifications to Android and iOS devices

AI & Prompts

Dev & PM Prompt Builder

Generate structured prompts and developer context for Claude Code and AI coding assistants

Practice & Learn

Git Workflow Playground

Interactive simulator that teaches branch flow, naming, commits, conflicts, revert/reset and branch syncing on a live Git graph

Why use these tools

Built for real developer workflows

Each tool solves a concrete task you hit while coding, shipping, or writing docs.

Fast and lightweight

Tools run in your browser. Open a page and start working in seconds.

Useful for technical writing and SEO

Convert Markdown, format content, and prep assets for technical blogs.

No unnecessary complexity

Clean interfaces, sensible defaults, keyboard shortcuts. Nothing to configure.

Who these tools are for

From solo builders to small teams shipping fast.

Developers

Quick utilities for debugging APIs, hashing, and prepping data — no context switch.

Technical bloggers

Improve SEO and turn Markdown into publish-ready, well-formatted content.

Indie hackers

Build and launch projects without installing heavyweight software.

AI builders

Draft structured prompts and format embeddings for AI workflows.

Small teams

Simple browser-based tools for everyday tasks, nothing to set up.

Learn how these tools are built and used in real projects

Hands-on articles on AI workflows, dev tooling, and project notes — the same thinking behind these tools.

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Try the tools and tell us what to improve next

Open any tool and start working. Got an idea for the next one? Let us know.

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