Collection
Fast, privacy-first utilities that run completely inside your browser. No data ever leaves your device.
48 tools
Format and validate JSON with one click.
Decode and inspect JWT tokens instantly.
Encode or decode Base64 strings.
Encode or decode URL components.
Validate JSON syntax and catch errors instantly.
Test and debug regular expressions live.
Generate v4 UUIDs instantly.
Generate strong, random passwords.
Count tokens for GPT, Claude, and other LLMs.
Estimate OpenAI API costs by token usage.
Check how much of a model's context window you're using.
Convert docker-compose.yml into Kubernetes manifests.
Validate Kubernetes manifest YAML syntax and structure.
Decode cron expressions into human-readable schedules.
Build cURL commands from a simple form.
Inspect and explain HTTP response headers.
Decode X.509 certificates into readable fields.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
Convert a JSON array into a CSV file.
Convert a CSV file into JSON.
Convert JSON into YAML format.
Convert YAML into JSON format.
Compare two JSON documents and see what changed.
Minify JSON by stripping whitespace.
Compare two blocks of text and highlight differences.
Convert Markdown into clean HTML.
Convert text between camelCase, snake_case, kebab-case, and more.
Count words, characters, and reading time instantly.
Convert text into a clean, URL-safe slug.
Encode or decode HTML entities.
Generate placeholder text for mockups and layouts.
Generate compact, URL-safe unique IDs.
Generate sortable, timestamp-based ULIDs.
Generate a QR code from text or a URL.
Convert between Unix timestamps and human-readable dates.
Convert colors between HEX, RGB, and HSL.
Visually build CSS linear and radial gradients.
Check color contrast against WCAG accessibility guidelines.
Calculate subnet ranges from CIDR notation.
Parse a User-Agent string into browser, OS, and device info.
Format and beautify GraphQL queries.
Generate and verify bcrypt password hashes.
Generate HMAC signatures with SHA-256/SHA-512.
Estimate password strength and entropy.
Convert PEM-encoded certificates to DER format.
Lint a Dockerfile for common issues and best practices.
Generate a values.yaml scaffold for Helm charts.
Convert a .env file into docker-compose environment config.