Developer Tools

Find the right aspect ratio for Midjourney, DALL-E, Stable Diffusion, and social media.

Build system prompts for ChatGPT, Claude and any LLM. Pick role, task and tone.

Build AI system prompts instantly. Pick role, task, and tone from dropdowns and get a complete, copy

Encode text to Base64 or decode Base64 strings back to text.

Convert colours between HEX, RGB, HSL, and CMYK with live preview.

Decode any cron expression into plain English. See next 10 run times.

Decode any cron expression into plain English. See the next 10 run times instantly. Build cron sched

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.

Format, minify, sort keys and validate JSON instantly.

Decode JWT tokens and see header, payload, claims, and expiry.

Estimate token count and API cost for GPT-4, Claude, Gemini, and Llama.

Cryptographically secure random passwords. Nothing stored.

Test regular expressions with live highlighted matches and group capture.

Encode and decode URLs and query string parameters.

Generate random UUID v4 identifiers. Bulk generate up to 50 at once.

Convert epoch timestamps to human-readable dates and back.