Developer tools

10 free developer tools that run in your browser — no signup, no watermark, no upload required.

• Generate a QR code — Turn any URL or text into a downloadable QR code PNG.
• Generate a strong password — Cryptographically secure passwords, generated in your browser.
• Generate a UUID — Cryptographically random UUIDv4 values.
• Hash any text — Compute SHA-1, SHA-256 or SHA-512 digests in your browser.
• Format & validate JSON — Pretty-print JSON with two-space indent. Errors highlighted.
• Encode or decode Base64 — Round-trip UTF-8 text to Base64 and back.
• Convert Unix timestamps — Convert between Unix time, ISO 8601 and human-readable dates.
• Convert CSV to JSON — Paste CSV, get a JSON array of objects.
• Calculator — Evaluate math expressions with +, -, *, /, %, ^, parentheses and functions (sqrt, sin, cos, log, ln).
• Currency converter — Convert between 30+ currencies using European Central Bank reference rates.