Free Developer Tools Online

Debugging at 2am shouldn\'t mean pasting production data into a random website. NToolHub\'s developer tools format JSON, test regexes, decode JWTs, and generate hashes entirely in your browser — your code and tokens never touch a server, which makes these safe to use even with sensitive payloads.

Base64 Decode

Decode any Base64 string to readable text instantly with NToolHub’s free decoder. Full UTF-8 support and input validation — 100% private, runs in your browser.

Base64 Encode

Encode any text to Base64 instantly with NToolHub’s free encoder. Proper UTF-8 handling, URL-safe option, line-wrap control — private and fast.

BCRYPT Generator

Generate secure bcrypt password hashes free with NToolHub. Adjustable cost factor, built-in verifier — everything runs privately in your browser.

Border Radius Generator

Set each corner with sliders and copy the CSS border-radius code instantly. Free border radius generator with live preview — no sign-up needed.

Box Shadow Generator

Create soft, realistic CSS box shadows with sliders and copy the code. Free box shadow generator for web designers — no sign-up required.

Color Code Converter

Convert colors between HEX, RGB and HSL instantly with NToolHub’s free converter. Live preview swatch, one-click copy — private and fast.

CSS Formatter

Beautify messy CSS instantly with NToolHub’s free CSS formatter. Clean indentation, readable rules, comment-safe — 100% private in-browser tool.

CSS Gradient Generator

Build linear, radial and conic CSS gradients visually and copy the code. Free CSS gradient generator with live preview — no sign-up.

CSS Minifier

Minify CSS for production with NToolHub’s free minifier. Strips comments and whitespace safely — see byte savings instantly, 100% private.

CSV To JSON

Convert CSV to JSON instantly with NToolHub’s free converter. Handles quoted fields, custom delimiters, header detection — 100% private.

GUID Generator

Generate random GUIDs instantly with NToolHub’s free generator. Braces, uppercase and bulk options — cryptographically random, 100% private.

Hash Generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes at once with NToolHub’s free tool. Compare algorithms side by side — private in-browser hashing.

HEX To RGB

Convert HEX codes to RGB values instantly with a live color preview. Free HEX to RGB converter, one-click copy — no sign-up needed.

HTACCESS Generator

Build Apache .htaccess rules visually with NToolHub’s free generator. HTTPS, www, redirects, hotlink protection — copy-ready server config.

HTML Formatter

Beautify messy HTML instantly with NToolHub’s free formatter. Clean indentation, readable markup, safe for inline code — 100% private.

HTML Minifier

Minify HTML for production with NToolHub’s free minifier. Removes comments and whitespace safely, protects scripts — see savings instantly.

HTML To Markdown

Convert HTML to clean Markdown with NToolHub’s free tool. Headings, lists, links, code and tables — fast, private, no sign-up.

Javascript Formatter

Beautify minified JavaScript with NToolHub’s free formatter. Smart brace indentation, string-safe — readable code instantly, 100% private.

Javascript Minifier

Minify JavaScript safely with NToolHub’s free minifier. String- and regex-aware compression with byte savings — 100% private in-browser.

JSON Formatter

Format and beautify JSON instantly with NToolHub’s free formatter. Syntax validation, error location, stats — private in-browser tool.

JSON Minifier

Minify JSON for production with NToolHub’s free minifier. Validates first, strips all whitespace, shows savings — 100% private.

JSON To CSV

Convert JSON arrays to CSV spreadsheets with NToolHub’s free tool. Proper quoting, custom delimiters — opens in Excel, 100% private.

JSON Validator

Validate JSON syntax instantly with NToolHub’s free validator. Clear verdicts, exact error positions, structure stats — 100% private.

JWT Decoder

Decode JWT tokens instantly with NToolHub’s free decoder. Read header and payload, check expiry — signatures never leave your browser.

JWT Generator

Generate unsigned test JWTs instantly with NToolHub’s free tool. Custom header and payload, live decode preview — test-only, private.

Markdown Editor

Write Markdown with live preview using NToolHub’s free editor. Split-pane editing, toolbar shortcuts, export HTML or .md — private.

Markdown To HTML

Convert Markdown to clean HTML with NToolHub’s free tool. Tables, code blocks, lists supported — copy or download, 100% private.

MD5 Generator

Generate MD5 hashes instantly with NToolHub’s free tool. Live hashing as you type, uppercase option, file checksum mode — private.

Meta Tag Generator

Generate SEO and social meta tags with NToolHub’s free tool. Title, description, Open Graph, Twitter cards — copy-ready HTML head code.

Password Hash Generator

Hash passwords securely with NToolHub’s free tool. Bcrypt plus salted SHA options, random salt, verifier — 100% private in-browser.

Regex Escape

Escape special regex characters instantly with NToolHub’s free tool. Safe literal matching, unescape mode — fast and private.

Regex Generator

Build regex patterns visually with NToolHub’s free generator. Token builder, presets, plain-English explanation — no regex PhD needed.

Regex Tester

Test regular expressions live with NToolHub’s free tester. Match highlighting, groups, flags, clear errors — 100% private.

RGB To HEX

Turn RGB values into HEX codes with sliders or typed input. Free RGB to HEX converter with live preview — no sign-up needed.

Robots Txt Generator

Generate robots.txt files visually with NToolHub’s free tool. Allow/disallow rules, sitemap reference, crawl delay — copy-ready.

SHA1 Generator

Generate SHA-1 hashes instantly with NToolHub’s free tool. Live hashing, file checksum mode, uppercase option — 100% private.

SHA256 Generator

Generate SHA-256 hashes instantly with NToolHub’s free tool. Live text hashing, local file checksums — secure, fast, 100% private.

SHA512 Generator

Generate SHA-512 hashes instantly with NToolHub’s free tool. 128-char digests, live hashing, file checksums — 100% private in-browser.

Sitemap Generator

Generate XML sitemaps free with NToolHub. Paste URLs, set priority and change frequency — valid sitemap.xml in seconds, 100% private.

Sql Formatter

Format messy SQL queries with NToolHub’s free formatter. Keyword highlighting layout, readable clauses — private in-browser tool.

Sql Minifier

Minify SQL queries with NToolHub’s free minifier. Strips comments and whitespace safely, protects strings — private in-browser tool.

Timestamp Converter

Convert Unix timestamps to readable dates and back with NToolHub’s free tool. UTC and local time, auto unit detection — private.

Unix Timestamp Converter

Convert Unix timestamps to readable dates and back, with automatic seconds and milliseconds detection built in. Free epoch converter, no sign-up.

Unix Timestamp Generator

Get the current Unix timestamp instantly with NToolHub’s free generator. Seconds or milliseconds, live updating — one-click copy.

URL Decode

Decode percent-encoded URLs instantly with NToolHub’s free tool. Handles UTF-8, plus-as-space, batch lines — private in-browser.

URL Encode

Percent-encode URLs and text instantly with NToolHub’s free tool. Component or full-URL mode, UTF-8 safe — private in-browser.

UUID Generator

Generate version 4 UUIDs instantly with NToolHub’s free tool. Cryptographically random, bulk mode, uppercase option — 100% private.

XML Formatter

Format and beautify XML instantly with NToolHub’s free formatter. Validates well-formedness, clean indentation — 100% private.

XML To JSON

Convert XML to JSON instantly with NToolHub’s free tool. Attributes, repeated elements, CDATA handled — private in-browser conversion.

XML Validator

Validate XML well-formedness instantly with NToolHub’s free validator. Clear verdicts, parser error details — 100% private.

YAML Formatter

Format YAML with clean 2-space indentation using NToolHub’s free formatter. Normalizes nesting, validates structure — private.

YAML To JSON

Convert YAML to JSON instantly with NToolHub’s free tool. Handles mappings, sequences, nested structures — private in-browser.

About Our Developer Tools

Formatters, validators, encoders, and generators below — every one free, fast, and private by design.