toolbox4devs.com

TOOL
BOX4DEVS

A curated set of everyday utilities for developers. Fast, clean, and completely client-side.

Browse All Tools →29 tools
·No ads·No tracking·100% browser·Always free
08Web04Encode / Decode04Text03Generatorsall categories →

Featured

POPULAR TOOLS

json→

JSON Formatter & Validator

Format, validate and minify JSON instantly — paste your JSON to beautify it, spot syntax errors, or compress it. Free, runs entirely in your browser.

/json-formatter
codegen→

JSON → Model

Convert JSON to C# classes or TypeScript interfaces with proper types.

/json-model
text→

Case Converter

Convert text between uppercase, lowercase, camelCase, snake_case, kebab-case and more.

/case-converter
text→

Slug Generator

Convert titles and labels into clean kebab-case or snake_case slugs entirely in your browser.

/slug-generator
Analyze→

Word Counter

Count words, characters, sentences, paragraphs and reading time instantly.

/word-counter
web→

Color Converter

Convert HEX, RGB, and HSL values instantly with a live color preview. Free and fully client-side.

/color-converter
ai→

Local AI Text Assistant

Summarize text, surface keywords, detect action items, and estimate sentiment fully in JavaScript with no API.

/local-ai-text-assistant
View all 29 tools →

What's new

CHANGE
LOG

This project ships regularly. Here's what landed recently.

Full changelog →
2026-03-18
newHTML Entity Encoder + MIME Type Lookup

Added two more browser-based tools for escaping HTML safely and checking common content types during web debugging.

2026-03-18
newSlug Generator + Lorem Ipsum Generator

Added two more fully client-side tools for generating clean slugs and placeholder copy directly in the browser.

2026-03-18
newMarkdown Preview

Launched a live Markdown previewer that renders headings, lists, tables, blockquotes, and generated HTML fully client-side.

Prove it

DON'T
TRUST US

We say we don't track you. Here's how to verify that claim yourself in under 60 seconds.

DevTools → Network tab
01
Open DevTools
Press F12 or right-click → Inspect
F12
02
Go to Network tab
Filter by "Fetch/XHR" or "All"
03
Use any tool
Paste a JWT, format some JSON, anything
04
Watch the silence
Zero outbound requests. Nothing phoning home.
Expected output
— no external requests —
0 / 0 requests

All requests you see will be to toolbox4devs.com — your own files. No analytics endpoints. No third-party scripts. No beacon calls.

Still skeptical? Open DevTools on any tool page and inspect the source yourself. No minified third-party bundles. No hidden scripts.

Why

BUILT FOR
DEVS

01

Privacy first

Every tool runs entirely in your browser. Your data never leaves your machine — paste your secrets safely.

02

No friction

No login. No sign-up. No paywall. Open the tool, use it, close it. That's the whole flow.

03

Always growing

29 tools today. New ones added regularly based on what developers actually need.

Community

MISSING
A TOOL?

Got a tool you reach for daily that's not here yet? Send a message — this toolbox is built around what developers actually use.

Send a suggestion →

toolbox4devs.com — built with care for developers who value clean tools.

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