Cron Expression Builder

Build a five-field cron expression from minute, hour, day, month, and weekday values and get a plain-English description of when the job runs — no server round trips.

Reference

Cron notes

What is Cron?

Cron is a time-based scheduler used to run commands, scripts, and background jobs automatically at fixed times or recurring intervals.

How does the Cron tool work?

A standard cron expression has five fields: minute, hour, day of month, month, and day of week. Each field can use numbers, wildcards, ranges, lists, and step values to describe when a job should run. This cron expression builder turns field values into a readable schedule description.

When should you use Cron?

  • Scheduling backend jobs and recurring workers
  • Running automated backups, cleanup tasks, and report generation
  • Triggering CI/CD maintenance jobs and deployment checks
  • Creating scheduled tasks for Linux servers and containers
  • Documenting cron schedules in a readable format

What are the limitations of Cron?

  • Standard Unix cron uses five fields and does not include seconds
  • Quartz, Kubernetes, GitHub Actions, and cloud schedulers may use different cron syntax
  • Cron expressions do not explain timezone behavior by themselves
  • Complex schedules with ranges, lists, and steps can be hard to read
  • Cron only describes timing; the job command and runtime environment still need separate configuration

Cron examples

Every minute * * * * * -> Runs every minute
Every hour 0 * * * * -> Runs every hour at minute 0
Daily midnight 0 0 * * * -> Runs every day at 00:00
Mondays 08:30 30 8 * * 1 -> Runs every Monday at 08:30
Related workflow

Automation & Patterns tools

Automation & Patterns
Regex Tester & Debugger Test, debug and replace with regular expressions. Supports Match/Test/Replace modes, positional and named groups, replacement patterns ($1, $&), global matching and detailed match reports.
Security & Identity
JWT Decoder and Encoder Decode JWT tokens, inspect JSON payloads, verify signatures with a secret, and generate HS256 tokens locally in your browser.
Data & Encoding
Base64 Encoder and Decoder Encode text or images to Base64, decode Base64 strings back to readable text, and preview image data URLs in the browser.
Data & Encoding
JSON Formatter & Validator Format, validate, pretty print, and minify JSON data in your browser for API responses, configuration files, and debugging.
Data & Encoding
JSON to TypeScript Interface Generator Convert JSON objects into TypeScript interfaces and generate sample JSON from simple TypeScript interfaces in your browser.
Security & Identity
UUID v4, v7 and v5 Generator Generate UUID v4, sortable UUID v7, namespace UUID v3/v5, GUID, URN, and hyphenless identifiers, then validate UUID strings locally.
Sharing
Custom QR Code Generator Create custom QR codes for URLs, Wi-Fi, vCard, email, SMS, events, and locations with a logo, gradients, module shapes, contrast check, and PNG, SVG, JPEG, or WebP export.
Security & Identity
Hash Generator Generate SHA-1, SHA-256, SHA-384, SHA-512, and BCrypt hashes from text for checksums, password hashing, and integrity checks.
Security & Identity
Password Generator Generate secure random passwords with customizable length, uppercase, lowercase, digits, and symbols for strong credentials.
Data & Encoding
URL Encoder and Decoder Encode and decode URLs, query strings, and text safely for web requests, links, and browser navigation.
Data & Encoding
Timestamp Converter Convert Unix timestamps, ISO dates, local time, UTC time, and timezone offsets directly in your browser.
Data & Encoding
YAML Formatter and YAML to JSON Format simple YAML, convert YAML to JSON, and convert JSON back to readable YAML for configs and manifests.
Text & Documents
Text and JSON Diff Checker Compare two text or JSON snippets side by side and review added, removed, and changed lines locally.
Network & Web
HTTP Headers Analyzer Parse HTTP headers into a table and highlight cache, security, CORS, and content negotiation signals.
Network & Web
CIDR and IP Subnet Calculator Calculate IPv4 network ranges, masks, usable hosts, broadcast addresses, and CIDR prefix details.
Design
Color Converter and Contrast Checker Convert HEX, RGB, and HSL colors and check WCAG contrast ratios for accessible UI color pairs.
Network & Web
User Agent Parser Parse browser user agent strings into browser, engine, operating system, device, and bot hints.
Text & Documents
SQL Formatter Format SQL queries with readable indentation, keyword casing, and line breaks for debugging and reviews.
Text & Documents
Markdown Preview Preview Markdown as HTML, inspect generated markup, and copy rendered HTML without sending text to a server.
Data & Encoding
HTML Entity Encoder and Decoder Encode text as HTML entities, decode entities back to text, and safely prepare snippets for markup.