Developer & Webmaster Guides
In-depth articles covering DNS, SSL, data formatting, security, encoding, and every tool on WMCoder.
Base64 Encoder & Decoder Online
Base64 turns bytes into safe ASCII text. WMCoder helps you encode and decode quickly while you keep URL-safe variants, padding, and non-security use cases straight.
Base64 Image Converter Online
Turn small images into data URIs—or recover files from Base64—for quick prototypes, emails, and embedded assets. Know the 33% size tax before you inline everything.
Color Converter: HEX, RGB, HSL
Translate between HEX, RGB, HSL, and HSB in one place. Pick the model that matches your job—token ramps in HSL, precise channels in RGB, handoffs in HEX.
Cron Expression Parser — Human-Readable Schedules
Turn cron expressions into clear language, field meanings, and upcoming run times—right in the browser, without sending schedules to a server.
CSV ↔ JSON Converter for Tabular Data
Bridge spreadsheets and APIs by converting tabular CSV and structured JSON with explicit control over delimiters and headers.
DMARC Checker: SPF, DKIM & Email Authentication
Query DNS for DMARC, SPF, and DKIM in one run: read v=DMARC1 policy, scan SPF for dangerous includes, and look up a DKIM selector. Built for webmasters and ops teams who need to verify email authentication and troubleshoot deliverability before tightening enforcement.
DNS Lookup: A, MX, CNAME & TXT Records
Query public DNS for A, MX, CNAME, TXT, NS, and more in seconds. Use it to verify deployments, debug mail, and confirm nameserver delegation without installing dig or juggling CLI flags.
Domain WHOIS Lookup - Owner, Expiry & Registrar
Query registration metadata for a domain: registrar, key dates, status codes, and published nameservers. Pair it with DNS and TLS checks when you are debugging ownership or cutover issues.
Email Validator - Syntax, MX & Deliverability
Check whether an email address is structurally sound, whether its domain can receive mail, and common risk signals—without replacing your ESP’s bounce handling.
Hash Generator: MD5, SHA-256, SHA-512
Cryptographic hashes fingerprint data in fixed-size digests. WMCoder generates common algorithms so you can verify downloads, debug APIs, and match upstream specs.
Hex & Number Base Converter — Binary to Hex
Hexadecimal lines up with bits and bytes, so it dominates low-level debugging, colors, and crypto digests. WMCoder converts between common bases without hand math.
Image Resizer & Optimizer Online
Resize and compress images before they hit your CDN or CMS. Right-sized pixels and the right codec cut bytes and improve LCP without changing your stack.
IP Blacklist Check - DNSBL & Reputation
See whether a public IP appears on common DNSBLs and reputation lists. Use it when diagnosing bounces, warming new mail infrastructure, or investigating a compromised host.
IP WHOIS Lookup - ASN, Range & RIR Data
Resolve an IP to its registered holder, netblock, RIR, and ASN context. Essential for abuse handling, peering questions, and understanding where traffic really originates.
JSON Formatter: Beautify, Validate & Minify
Turn messy JSON into readable, valid output—or compact it for production—without leaving the browser.
JSON Schema Generator
Turn sample JSON into a draft-07 JSON Schema in the browser—types, nesting, arrays, enums, common string formats, and strict or loose required fields—with one-click copy.
JSON ↔ YAML Converter: Two-Way, Fast
Move between JSON and YAML with a clear view of structure—ideal for configs, CI files, and API fixtures without retyping by hand.
JWT Parser & Token Debugger Online
JWTs carry signed (or MAC’d) JSON claims in a compact wire format. WMCoder decodes header and payload so you can debug tokens—verification still belongs in your backend.
Lorem Ipsum Generator | Placeholder Text
Generate classic lorem ipsum—or structured placeholder blocks—in the shape your layout needs. Dial in paragraphs, sentences, or words and paste without hunting sample copy.
Markdown Preview & Live HTML Output
See Markdown render as you write and grab HTML when your publishing stack needs it—fewer surprises on GitHub or in static site builds.
Password Generator | Strong & Random
Generate high-entropy passwords with control over length and character classes—optimized for real site policies, not theatrical complexity. Copy once, store in a manager, and pair with MFA.
Free QR Code Generator Online
Generate scannable QR codes for URLs, WiFi, and contacts. Balance error correction, contrast, and module size so real phones decode on the first try.
Random String Generator | Tokens & Test Data
Create random strings with the alphabet and length your system expects—from hex keys to alphanumeric tokens—without writing a script. Ideal for fixtures, local dev secrets, and quick entropy checks.
Regex Tester | Pattern Match & Debug Online
Type a pattern and subject text, then inspect matches and capture groups instantly. Use it to validate extraction logic before you wire regex into production code or configs.
Security Headers Analyzer - CSP & HSTS
Inspect security-related HTTP response headers for any URL. Quickly see whether CSP, HSTS, and framing protections are present, coherent, and appropriate for your app.
XML Sitemap Generator for SEO
Build an XML sitemap from a starting URL with sensible defaults for large sites. Use it to accelerate discovery while you keep on-page SEO and internal linking in good shape.
SSL Certificate Checker - Expiry & Chain
Inspect the live HTTPS certificate: validity window, SANs, issuer, and trust chain. Catch expiry and trust issues early, before browsers and APIs start rejecting connections.
SVG Viewer & Preview Online
Inspect SVG markup and see exactly how it draws—before you ship icons, logos, or charts. Understand viewBox and scaling so your vectors look sharp at every size.
Text Diff Checker | Compare Text Side by Side
Paste two versions of any text and see exactly what changed—line by line or in a compact unified view. Use it for code review prep, contract redlines, and catching accidental edits before you commit.
Timestamp & Epoch Converter
Convert between epoch seconds, milliseconds, and human-readable ISO dates with clear timezone context. Stop guessing whether a JSON field is in seconds or ms.
TLS Scanner - Versions, Ciphers & Weaknesses
Assess live TLS: supported versions, cipher suites, and classic misconfiguration patterns. Use it to align your HTTPS endpoint with current best practice without maintaining your own SSL Labs–style lab.
URL Encoder & Decoder — Percent Encoding
Percent encoding keeps URLs unambiguous when data contains reserved characters or non-ASCII text. WMCoder encodes and decodes so you can debug APIs, redirects, and query strings fast.
UUID Generator | v4, v7 & GUID Online
Produce RFC-compliant UUIDs in the version your architecture needs—random v4 for opacity, v7 for time-friendly indexing. Copy standard hyphenated strings ready for JSON and SQL.
XML Formatter: Beautify & Validate Structure
Indent and inspect XML so integration bugs, namespace issues, and mismatched tags surface before they hit production traffic.