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Essential utilities for developers. Format and validate JSON, convert between CSV and JSON, encode and decode Base64 and URLs, decode JWTs, test regular expressions, validate cron scheduling, and generate secure passwords.
Generate regex patterns for validation, extraction, and replacement scenarios.
Generate JSON Schema draft 2020-12 with validation constraints for API and data pipelines.
Validation, formatting and syntax highlighting for JSON.
Encode and decode text to/from Base64 format with UTF-8 support.
Encode and decode URL components or form values with UTF-8-safe browser processing.
Decode JWT header and payload locally, inspect exp/iat/nbf claims, and debug bearer tokens without uploading them.
Convert CSV exports into clean JSON locally, inspect headers and rows, and copy or download API-ready output without uploads.
Convert JSON arrays into clean CSV locally, flatten nested objects when needed, and copy or download spreadsheet-ready exports without uploads.
Convert Unix timestamps and ISO 8601 values locally, switch between seconds and milliseconds, and inspect UTC vs local time without uploads.
Test regular expressions with live match highlighting and capture groups.
Validate cron expressions, see next run times, and field breakdown.
Convert HEX/RGB/HSL/CMYK, color harmonies, palette, and WCAG contrast.
Merge, split, extract pages, and compress PDF files with queued server processing.
Cryptographically secure password generator.
Paste any code snippet and get a clear, human-readable explanation powered by a 480B coding model.
Convert code between Python, JavaScript, Go, Rust, TypeScript, and more using a 480B coding model.
Get an instant AI code review — find bugs, security vulnerabilities, and performance issues.
Describe a UI element and get production-ready CSS, Tailwind classes, or responsive styles.
Paste your API route handler and get OpenAPI specs, Markdown docs, or JSDoc annotations.
Paste a diff or describe changes — get a well-structured commit message in Conventional Commits or other formats.
Describe a schedule in plain English and get the correct cron expression with an explanation.
Paste a slow SQL query and get optimization suggestions, execution plan analysis, and index recommendations.
Paste a git diff and get an AI-powered code review with change summary and risk assessment.
Engineering teams hit the same routine tasks dozens of times a week: validate JSON before shipping a payload, decode a JWT to confirm scopes, regex-test a parser, sanity-check a Unix timestamp, encode a string for a query parameter. Each is trivial in isolation and a context-switch tax in aggregate. This hub keeps them one click away.
Every utility runs locally in your browser. Tokens, payloads, secrets, and customer data never leave your machine — even on the AI-assisted tools, requests are scoped to a single completion and never logged. There is no account, no rate limit, no telemetry on what you paste in.
Use this set when you want a fast sanity check during code review, a copy-paste sandbox to verify a regex against real log lines, or a no-install timestamp converter for an incident timeline. Each tool links to a focused blog post with deeper patterns — index/match, cohort SQL, JSON schema validation — when you need methodology rather than just an answer.