Developer Tools

Encode text to Base64 or decode Base64 strings instantly. Supports UTF-8 and file encoding.

Free QR code generator with custom colors, logos, gradients, and 10 data types (URL, WiFi, vCard, email, SMS, crypto). Download as PNG, SVG, JPEG, or WebP — no signup required.

Generate strong, random passwords with customizable length, symbols, numbers, and strength indicator.

Encode special characters to HTML entities or decode entities back to readable text.

Format, validate, and minify JSON with syntax highlighting and instant error detection.

Test regular expressions in real time with match highlighting, flags, and capture group inspection.

Encode and decode URL strings for safe query parameters, path segments, and web debugging.

Convert Unix timestamps to human-readable date/time and convert dates back to epoch format.

Generate placeholder text by paragraph, sentence, or word count for mockups and content drafts.

Decode JWT headers and payloads, inspect claims, and quickly check token expiry timestamps.

Generate secure UUID v4 values in bulk with formatting options for braces, hyphens, and uppercase output.

Validate cron syntax and preview upcoming run times in UTC to debug schedules before deployment.

Look up HTTP status codes and meanings fast to troubleshoot API responses and integration issues.

Build cURL commands with headers, auth, query params, and body payloads for reliable API testing.

Format messy SQL into readable clauses, normalize keyword casing, and produce compact minified queries.

Generate JSON Schema from sample payloads for validation rules, contracts, and structured AI outputs.

Create reusable AI prompt templates with variables and export rendered message JSON for LLM APIs.

Generate multiple high-quality prompt rewrites from one base instruction to improve reliability, structure, and output style.

Compare two prompts side by side with token and clarity heuristics to pick a stronger baseline before deployment.

Score model responses for relevance, structure quality, and risk signals to quickly diagnose weak output patterns.

Repair common malformed JSON issues from AI outputs and return valid formatted JSON for downstream workflows.

Detect common prompt-injection and instruction-override patterns in untrusted text before sending it to an LLM.

Compress verbose prompts into tighter instructions while preserving intent and reducing estimated token usage.

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files. All hashing runs locally in your browser.

Compare two blocks of text side by side and see added, removed, and unchanged lines instantly.

Encrypt and decrypt text with AES-GCM, PBKDF2 passphrase hardening, raw AES keys, AAD, and optional gzip compression. Export as JSON envelope or compact token.

Calculate Unix file permissions with an interactive checkbox matrix. Convert between octal and symbolic notation.

Upload CSV, TSV, or JSON files and query them with SQL directly in your browser. Auto-detects schema, generates example queries, and exports results as CSV. Powered by SQLite via WebAssembly.