D4rC Tools

All tools

• Resources

  Tech News

  Curated security, hosting and development news with vulnerability warnings from fixed trusted sources.

  CISA KEVGHSACERT.atHosting
• Sharing

  Secure Share

  Share secrets and files end-to-end encrypted. The key never leaves your browser.

  AES-256-GCMZero-KnowledgeOne-time
• Sharing

  No-Paste

  Share code and text via link. Expires automatically, syntax highlighting included.

  Share linkExpiryHighlight
• Security

  Password Generator

  Strong passwords, passphrases and PINs with entropy rating. Generated in your browser.

  PassphrasesCSPRNGEntropy
• Security

  Password Check

  Calculate entropy and strength locally and check against Have I Been Pwned via k-anonymity.

  EntropyHIBPCrack time
• Network

  My IP

  Your public IPv4/IPv6 address, hostname and approximate location – plus the d4rc.net IP API docs.

  IPv4 · IPv6Reverse DNSAPI
• Security

  Security & Crypto

  Decode and verify JWTs, generate TOTP codes, inspect certificates, create CSRs and fingerprint SSH keys – all locally.

  JWTTOTPX.509SSH
• Security

  .htaccess Generator

  Protect directories with password hashes and IP filters for LiteSpeed and Apache.

  bcryptIP filterApache 2.4
• Security

  Text Hash

  Hash any text with digests, HMAC and password hashes – and verify existing hashes.

  SHA-2/3bcryptArgon2id
• Development

  Random Hashes

  Generate up to 100 random test hashes at once. Copy individually or export.

  MD5SHA-256Batch
• Development

  Base64 Converter

  Encode and decode text, files and images. Data URI, CSS, HTML and more output formats.

  Data URIImagesUTF-8
• Development

  JSON Tool

  Validate, format, minify and explore JSON in an interactive tree view.

  ViewerFormatValidate
• Design

  Color Picker

  Pick colors directly on the page, convert formats, build palettes and check contrast.

  HEX · RGB · HSLOKLCHWCAG
• Design

  Lock Pattern

  Draw Android-style unlock patterns and export them as PNG for documentation.

  3×3 · 4×4 · 5×5PNGArrows
• Network

  Network Tools

  Subnet and CIDR calculator, IP converter, MAC vendor lookup and a port reference – fully offline.

  IPv4 · IPv6CIDRMACPorts
• Server

  Linux Tools

  chmod calculator, cron explainer, systemd units, command builders, fstab and logrotate generators.

  chmodCronsystemdfstab
• Server

  Docker Tools

  Convert docker run to Compose, build and validate compose.yaml, plus volume, resource and Dockerfile generators.

  ComposeDockerfileVolumesLimits
• Server

  Web Tools

  Analyze security headers and CSP, generate CORS and robots.txt, look up MIME types and status codes, size PHP upload limits.

  HeadersCSPCORSrobots.txt
• Development

  Developer Tools

  Regex, text diff, case conversion, encoding, local QR codes, SemVer and line processing.

  RegexDiffQRSemVer
• Server

  Admin Calculators

  Unix time, date differences, transfer times, SI vs. IEC, storage growth, RAID capacity and backup retention.

  Unix TimeRAIDBackupGiB
• Network

  Domain Tools

  Registration, DNS, DNSSEC, mail policy and network intelligence using controlled registry and resolver services.

  RDAPWHOIS fallbackDNSSECASN
• Resources

  Toolbox

  Downloads with checksum, file size and counter. Protected files require a password.

  SHA-256ProtectedCounter
• Resources

  Useful Links

  A curated collection of handy services for security, network, development and servers.

  CuratedSearchable

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