Developer Tools
JSON, Base64, URL, regex, and code formatting utilities — each on its own page.
JSON Formatter
Beautify and format JSON data instantly.
Open tool →JSON Validator
Check JSON syntax and find errors fast.
Open tool →JSON Minifier
Compress JSON by removing whitespace.
Open tool →JSON Repair
Fix broken JSON from LLMs and configs.
Open tool →Base64 Encoder
Encode text or files to Base64 format.
Open tool →Base64 Decoder
Decode Base64 strings back to text.
Open tool →URL Encoder
Encode URLs for safe web transmission.
Open tool →Multiple URL Opener
Open many links in new tabs at once.
Open tool →UUID Generator
Generate unique UUIDs in one click.
Open tool →Password Generator
Create strong and secure passwords.
Open tool →Regex Tester
Test and debug regular expressions.
Open tool →Text Diff Checker
Compare two texts and highlight differences.
Open tool →Excel Compare
Compare two Excel files and highlight cell differences.
Open tool →JavaScript Beautifier
Format and beautify JavaScript code online.
Open tool →HTML & CSS Beautifier
Beautify HTML markup and CSS stylesheets.
Open tool →Word to HTML Generator
Convert Word docs into a styled HTML page with CSS.
Open tool →Website Builder
Build multi-page sites from templates, 24 blocks, and a brand theme — export clean HTML/CSS.
Open tool →Frequently Asked Questions
What is Developer Tools?
Developer Tools is a collection of free browser-based utilities for working with JSON, Base64, URLs, regular expressions, and source code formatting.
Which developer tools are available?
JSON Formatter, JSON Validator, JSON Minifier, JSON Repair, Base64 Encoder and Decoder, URL Encoder, Multiple URL Opener, UUID Generator, Password Generator, Regex Tester, Text Diff, Excel Compare, JavaScript Beautifier, HTML/CSS Beautifier, Word to HTML, and Website Builder.
Is my data uploaded to a server?
No. These tools run entirely in your browser, so the text, code, and files you paste never leave your device.
Is Developer Tools free to use?
Yes. All Neemtools utilities are free to use with no signup required.
Is my data uploaded when I use Developer Tools?
For most tools, processing happens in your browser and your input is not stored on our servers. A few tools may fetch live URLs when that feature requires external data — each tool page explains what applies.
Do I need an account to use Developer Tools?
No account is required. Open the tool and start using it immediately.