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Tool Category Map

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Count words, chars, reading time

UPPER, lower, camelCase & more

Lorem Ipsum Generator

Generate placeholder text

Flip text chars or words

Beautify & validate JSON

Encode or decode Base64

Encode/decode URL strings

Escape HTML entities

Test regex patterns live

MD5, SHA-256, SHA-512

Color Converter

HEX, RGB, HSL, CMYK

CSS Gradient Maker

Build gradients visually

Password Generator

Cryptographically strong

Length, weight, temp, speed

Exact age in years/days

Body mass index checker

Random Number Gen

Generate random numbers

Meta Tag Generator

OG, Twitter, SEO tags

Timestamp Converter

Unix ↔ readable date

Decode JWT header & payload

Random UUID v4 in bulk

Compare two texts line by line

SEO-friendly URL slugs

Latest practical guides

Short explainers for the problems people search before opening a tool.

All guides →

Text Title Case vs Sentence Case Know which style to use in headings, buttons, filenames and code. Developer URL Encoding Query Parameters Fix broken links with spaces, ampersands, hashes and Unicode. Math Unit Conversion Formulas Convert metric, imperial, temperature and speed without guessing. Health BMI Formula Metric and Imperial Calculate adult BMI and understand why it is only a screening number. Finance Loan Payment Formula Estimate monthly payment, total interest and full repayment cost. Developer Convert JSON to CSV Prepare JSON arrays for Excel, Google Sheets and database imports.

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Free Online Tools for Developers & Productivity

ToolZone is a curated collection of 28 free online tools for developers, designers, writers, and everyday productivity. Every tool runs entirely in your browser — no signup, no uploads. Your tool input never leaves your device.

Format and validate JSON, generate strong passwords, encode and decode Base64 or URLs, test regular expressions, convert colors, build CSS gradients, calculate BMI or age, generate Lorem Ipsum, hash text with MD5 or SHA-256, and more — all from a single fast, private, dark-themed workspace.

Whether you're a developer needing quick utilities, a designer working with colors and gradients, or a writer counting words and characters, ToolZone gives you instant, low-clutter access to professional-grade web tools that work offline once loaded.

Free HTML Encoder & Decoder

Convert characters to and from HTML entities. Encoding is essential when you display user input inside HTML to prevent XSS attacks; decoding helps you read raw HTML source or convert exported text back to its original form.

Features

Encodes &, <, >, " and ' to their HTML entities
Decoder handles named and numeric entities
Output is XSS-safe — uses textContent under the hood

How to use

Step 1. Paste text or HTML-encoded content.
Step 2. Click Encode or Decode.
Step 3. Copy the result.

Real use case: publishing a code snippet inside a blog post

A technical writer wants to show readers a literal <script> example inside an article. Pasted directly into the CMS, the browser executes it instead of displaying it — the snippet disappears and, worse, the page now runs untrusted markup.

Encoding the snippet first turns < into < and > into >, so the browser prints the characters instead of parsing them. The same trick fixes user-submitted comments that display as &amp; — decoding once shows exactly how many times the value was escaped along the way.

How HTML Encoder / Decoder works

Encoding replaces the five characters that are syntactically meaningful in HTML — & < > " ' — with their named entities & < > " and '. Ampersand is always replaced first, otherwise the & inside the entities you just produced would be double-escaped.

Decoding maps named and numeric entities (both decimal © and hexadecimal © forms) back to characters, using a lookup rather than assigning to innerHTML, so decoding never executes markup.

Escaping is the primary defence against cross-site scripting: any untrusted value inserted into HTML must be encoded so it is treated as text, never as tags.

HTML Encoder / Decoder vs similar tools

HTML escaping options compared:

Tool	How it works	Trade-off
Template engines (JSX, Handlebars)	Auto-escape interpolated values at render time.	Protects your app automatically, but does not help you prepare a snippet for a CMS field.
innerHTML round-trip in the console	Assign then read back to escape or unescape.	Executes markup while unescaping — an XSS risk on untrusted input.
ToolZone HTML Encoder / Decoder	Explicit, non-executing escape and unescape of a pasted block.	A manual step; sanitising a whole application still needs a proper library.

Frequently Asked Questions

Why escape HTML?

Inserting unescaped user input into a page lets attackers run JavaScript (XSS). Encoding turns dangerous characters into harmless entities the browser will display as text.

Does it handle named entities like &copy;?

Yes, decoding supports common named entities as well as numeric (&#39;) and hex (&#x27;) forms.

Related Developer tools

Guides worth reading

Browse all ToolZone guides →