Contents
  1. Why a Browser-Based Toolkit
  2. Formatters
  3. Encoders & Decoders
  4. Generators
  5. Debuggers & Testers
  6. Network & Reference Tools
  7. A Complete Dev Workflow
  8. Frequently Asked Questions

Why a Browser-Based Toolkit

Most online developer tools upload whatever you paste to their server. That is a real risk when you are debugging a JWT, decoding a Base64 payload, or formatting a config file that contains secrets.

Every formatter, encoder, decoder, hasher, and diff tool on iluv.tools runs client-side. The JavaScript executes in your browser tab, the input never crosses the network, and the tool works even offline after first load. The only exceptions are a handful of AI-powered helpers (code explainer, regex explainer, SQL query generator, README generator) that send your input to the DeepSeek API — and even those store nothing. Network lookup tools like DNS and WHOIS query public APIs by design.

Why it matters: A JWT from production, a hashed API key, an encrypted config block — these show up in your clipboard every day. A local tool means you can inspect them without handing them to a third party. This is the same privacy model as our Base64 guide and JWT debugging guide.

Formatters

Formatting unreadable minified code or data is the most common daily dev task. These tools beautify, validate, and compress in one click.

JSON Formatter
Pretty-print, minify, validate, and sort JSON keys. Error highlighting included.
JSON Validator
Validate JSON and JSONL with a structure tree of keys, types, and depth.
SQL Formatter
Format SQL queries with configurable indentation and keyword casing.
CSS Minifier
Remove comments and whitespace — see size comparison and compression %.
JavaScript Minifier
Compress JS by stripping comments and whitespace. Size comparison shown.
HTML Minifier
Minify HTML and see compression stats. Free, instant, private.

Encoders & Decoders

Encoding is everywhere in web development — URLs, HTML entities, and binary data. These tools encode and decode instantly, locally.

Base64 Encoder / Decoder
Encode or decode Base64 text and files. 100% private, in-browser.
URL Encoder / Decoder
Percent-encode strings for safe use in URLs and query parameters.
HTML Entity Encoder
Encode and decode angle brackets, ampersands, quotes, and more.
Unicode Analyzer
Inspect code points, UTF-8/UTF-16 bytes, HTML entities, and character names.

Deep dives: how Base64 works, URL encoding explained, and the regex beginner guide.

Generators

Need a hash, a UUID, a gitignore file, or a SQL query? These generators produce ready-to-use output in seconds.

Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes locally.
UUID Generator
Generate UUID v1 and v4, with batch generation for many IDs at once.
.gitignore Generator
Create .gitignore files for any language, framework, or editor.
Markdown Table Generator
Build and edit Markdown tables visually — great for README files.
cURL Command Builder
Build cURL commands visually with method, URL, headers, and body.
SQL Query Generator AI
Generate SQL from plain English for MySQL, PostgreSQL, SQLite, and more.
README Generator AI
Create professional GitHub README files with badges, install, and usage.

Debuggers & Testers

When something breaks, these tools help you find out why. All processing happens locally.

JWT Decoder
Decode JWT tokens and inspect the header, payload, and signature.
Regex Tester
Test regular expressions against sample text with live match highlighting.
Regex Visualizer
See highlighted matches, capture groups, and a plain-English breakdown.
Regex Explainer AI
Paste any regex and get a human-readable component-by-component breakdown.
Diff Checker
Compare two texts side by side with color-coded changes.
API Tester
Send HTTP requests and inspect status, headers, and body from your browser.
HTML Preview
Paste HTML and see it rendered live in a sandboxed iframe.
Cron Expression Parser
Translate cron syntax to plain English and preview the next run times.

Network & Reference Tools

For the infrastructure side of development — domains, DNS, certificates, and HTTP — these reference tools query public data on demand.

DNS Lookup
Look up A, AAAA, MX, CNAME, TXT, NS, and SOA records via DNS-over-HTTPS.
WHOIS Lookup
Find registrar, creation date, expiry, and nameservers via RDAP.
IP Info
Look up IP geolocation, ISP, timezone, and ASN. Auto-detect your own IP.
SSL Checker
Check certificate issuer, validity dates, SANs, and chain info.
HTTP Status Codes
The complete 1xx–5xx reference with reason phrases and use cases.
MIME Type Lookup
Search IANA MIME types by extension or content-type.
Color Converter
Convert between HEX, RGB, HSL, HSV, and CMYK with live preview.
AI Code Explainer AI
Paste any code and get a plain-English explanation in any language.

A Complete Dev Workflow

Used together, these tools cover a full debugging session without installing anything:

  1. Decode the payload — decode a JWT or Base64 to see what you are actually working with.
  2. Format it — run the result through the JSON formatter or SQL formatter to make it readable.
  3. Test your logic — build and verify a pattern in the regex tester before you deploy it.
  4. Hunt the difference — compare the broken and working versions in the diff checker.
  5. Verify the target — check the endpoint with API tester, the domain with DNS lookup, and the cert with SSL checker.

Frequently Asked Questions

Are these developer tools really free?

Yes. Every developer tool is completely free with no signup, no rate limits, and no pro tier. Format, encode, decode, and test as much as you need.

Does my code leave my device?

No. All formatters, encoders, decoders, hash generators, regex testers, and diff checkers run entirely in your browser using JavaScript. Nothing is uploaded, so you can safely paste API keys and tokens.

Can I use these tools offline?

Most of them work offline after the page has loaded, because processing happens locally. A few network-dependent tools — DNS lookup, WHOIS, IP info, and SSL checker — need an internet connection.

Is the JWT decoder safe for production tokens?

Yes. The JWT decoder runs locally in your browser — it simply base64-decodes the header and payload segments. Nothing is sent to a server. Still, avoid pasting tokens you are not authorized to inspect.

How is the JSON formatter different from the JSON validator?

The JSON formatter pretty-prints, minifies, and sorts keys. The JSON validator checks syntax and shows a structure tree of keys, types, and depth — useful for spotting errors in large payloads.

Are the AI developer tools free too?

Yes. AI tools like the code explainer, regex explainer, SQL query generator, and README generator are free. They send your input to the DeepSeek API for processing but store nothing.

Open a developer tool — free, local, and private.
Browse All Developer Tools →