Free Online Tools for Developers
Fast, private, no sign-up. Every tool runs 100% in your browser — your data never leaves your device.
Unix Timestamp Converter
Convert epoch timestamps to readable dates and back, with automatic seconds/milliseconds detection.
Base64 Encode / Decode
Encode text to Base64 or decode it back instantly. Unicode-safe, works fully offline in your browser.
Hex to RGB Converter
Convert hex color codes to RGB with a live preview, plus RGB-to-hex and CSS-ready output.
UUID Generator
Generate random v4 or time-ordered v7 UUIDs in bulk, with formatting options and one-click copy.
Rem to PX Converter
Convert between rem and px with a custom root font-size, plus a handy reference table.
HTML Entity Encoder / Decoder
Escape & < > " to HTML entities for safe display, or decode entities back to text.
URL Encoder / Decoder
Percent-encode full URLs or just query parameter values, with live decode and one-click copy.
Chmod Calculator
Convert between octal (755), symbolic (rwxr-xr-x) and rwx bits with presets for 644, 755 and 600.
Cron Expression Generator
Build cron schedules visually, read them in plain English, and preview the next 5 run times.
YAML ↔ JSON Converter
Convert YAML to JSON and back with a hand-rolled parser and precise line-numbered errors.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text, computed live in your browser.
JSON to CSV Converter
Flatten nested JSON arrays to RFC 4180 CSV with a column picker and one-click download.
SVG to Data URI Converter
Turn SVG code into optimized data URIs with live preview and byte-size comparison.
CSS clamp() Calculator
Generate fluid clamp() typography formulas with a live viewport-width slider preview.
HTTP Status Code Lookup
Search 50+ HTTP status codes — what each means and the real-world scenarios behind them.
Why TinyKit?
- Private by design. All conversions happen locally in your browser with JavaScript. Nothing you type is uploaded anywhere — paste secrets, tokens, or proprietary text with confidence.
- Fast and free. No accounts, no paywalls, no waiting. Pages are plain HTML with no heavy frameworks, so they load instantly even on slow connections.
- Built for real workflows. Each tool handles the edge cases developers actually hit: millisecond vs second timestamps, Unicode in Base64, UUID v7, custom root font sizes.