kilaz.com · Developer

Developer Tools

Everyday encoders, formatters and testers: JSON, YAML and CSV, Base64, URL encoding, JWTs, regular expressions, diffs, timestamps, UUIDs, cron schedules and colours.

14 tools
Runs in your browser
No sign-up

🔤 Base64 Encoder / Decoder 🔗 URL Encoder / Decoder 📋 JSON Formatter & Validator 🔢 Hex Viewer 🎟️ JWT Decoder 🎨 Color Converter & Contrast

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Base64 Encoder / Decoder Encode and decode text or files to and from Base64, including URL-safe output.

URL Encoder / Decoder Percent-encode and decode URLs or individual query components.

JSON Formatter & Validator Beautify, minify and validate JSON with clear error messages.

Hex Viewer View text, hex, base64 or a file as a hex/decimal byte dump with ASCII gutter.

JWT Decoder Decode JSON Web Tokens, check expiry and verify HMAC signatures.

Color Converter & Contrast Checker Convert HEX, RGB, HSL, HWB and OKLCH, build tints and shades, and check WCAG contrast.

JSON ⇄ YAML ⇄ CSV Converter Convert data between JSON, YAML and CSV with clear errors, flattened nested keys and delimiter detection.

Markdown Live Preview Write GitHub-flavored Markdown with a live, sanitized preview. Copy or download the HTML.

HTML Entity Encoder / Decoder Encode text to named, decimal or hex HTML entities, or decode any entities back to plain text.

Regex Tester Test JavaScript regular expressions with live highlighting, capture groups and replace preview.

Text Diff Checker Compare two texts side by side or unified, with added, removed and changed words highlighted.

Unix Timestamp Converter Convert epoch timestamps (s, ms, µs, ns) to readable dates and back, in any time zone.

UUID / ULID Generator Generate UUID v4, time-ordered UUID v7 and ULIDs in bulk, and inspect any UUID or ULID.

Cron Expression Explainer Turn cron schedules into plain English and see the next 10 run times in local time or UTC.

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