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Useful tools

Small, client-side helpers for links, writing, and developer workflows. No sign-in required.

Links & network

  • UTM builder and parserBuild tracked links or inspect query parameters from a URL.
  • QR code generatorGenerate a QR image from text or a URL.
  • URL encode / decodePercent-encode or decode URL components.
  • Extract linksGrab URLs from prose and dedupe.
  • MIME lookupExtension → common Content-Type.
  • IP lookupPublic geolocation, ASN, timezone, and offline IPv4/IPv6 checks.

Content & text

  • Markdown previewLive preview while you write.
  • Text diffLine-by-line differences between two texts.
  • Slug generatorSEO-friendly path segments from titles.
  • HTML to textStrip tags for plain text.
  • OG previewParse Open Graph tags from HTML.
  • Word countCharacters, words, lines, paragraphs, CJK count.
  • Lorem ipsumRandom multi-paragraph Latin-style filler text.
  • Case and namingUPPER, lower, camelCase, kebab-case, and more.
  • HTML entitiesEscape or unescape <, >, &, and quotes.
  • Line toolsSort, unique, trim, drop blanks, reverse.
  • Markdown tableSheet rows to GFM pipe table.
  • Word frequencyTop Latin words and CJK characters.

Data & dev

  • JSON / YAMLFormat JSON or convert between JSON and YAML.
  • Timestamp and zonesSeconds/ms, IANA zones, multi-zone table, calendar info, ISO string parse.
  • Base64 encode / decodeUTF-8 text and Base64 conversion.
  • Regex testerRun RegExp and list matches.
  • JWT decoderInspect header and payload JSON.
  • UUID generatorRandom UUID v4 in batch.
  • SHA-256Text fingerprint hash.
  • Password generatorLength and charset mix, secure random.
  • AI token calculatorEstimate OpenAI-style tokens by model vocabulary.
  • Hex encode/decodeUTF-8 bytes as hex and back.
  • ROT13Rotate Latin letters by 13.
  • Radix converterBinary, octal, decimal, hex integers.
  • CSV / TSV / tableDelimited data ↔ Markdown table.
  • XML formatterPretty-print XML locally.
  • JSON stringSafe JSON string encode/decode.
  • SemVerCompare versions and bump hints.
  • Luhn checkMod-10 validation and check digit.
  • IBAN checkMod-97 IBAN validation.
  • Cron hintsRanges, lists, steps, names, summary, presets.
  • User-AgentRough browser/OS from UA.
  • Sort JSON keysRecursive key sort + format.
  • HMAC-SHA256Message auth code in the browser.
  • IPv4 subnetNetwork, broadcast, usable hosts.
  • Repeat & padrepeat / padStart / padEnd.
  • Random pickShuffle, pick one, pick N.
  • UTF-8 BOMDetect or add/remove BOM bytes.
  • Random hexCSPRNG bytes as hex.

Color & CSS

  • Color contrastWCAG contrast checks.
  • Safe colorsWCAG contrast pairs and text-on-bg picks.
  • Linear gradientCopy linear-gradient CSS.
  • Box-shadowVisual box-shadow builder.
  • Color mixBlend two hex colors.