Cron generators, regex builders, JSON formatters and more β fast, free, and built for developers who hate friction.
Live example β CronBuilder
Tools
Cron expressions, decoded.
Generate, explain, and validate cron expressions. Get plain-English explanations, next run times, and ready-to-paste code for Node.js, Python, Linux, and GitHub Actions.
Regex built visually.
Visual regex builder, tester & explainer with 22 real-world patterns. Live matching with plain-English token breakdown and code export.
JSON formatted, typed, and exported.
Format, validate, and transform JSON. Generate TypeScript interfaces, Zod schemas, CSV export, and sorted keys β all in the browser.
Hash, encode, decode, generate.
MD5, SHA-1, SHA-256, SHA-512 hashing. Base64 encode/decode, URL encode/decode, and UUID v4 generator β all processed locally in your browser.
Parse, build, and decode URLs.
Break any URL into its components β protocol, host, path, query params, fragment. Build query strings visually and encode/decode URL components.
See exactly what changed.
Side-by-side and inline text diff with line-level highlighting. Works for code, JSON, SQL, Markdown. Supports unified and split view.
Design tokens from one brand color.
Input a single hex color and generate a complete design system β primary/neutral scales, dark mode tokens, WCAG contrast ratios, Tailwind config, and CSS variables.
Professional invoices in 60 seconds.
Create, preview, and download professional PDF invoices without signing up. Add your logo, itemize services, and send to clients β all in the browser.
CSV, previewed and transformed.
Preview, filter, sort, and convert CSV files. Export to JSON, SQL INSERT statements, Markdown tables, or TSV. Drag-and-drop or paste β no server upload.
HTTP requests, fired from the browser.
Lightweight REST client. Build GET/POST/PUT/PATCH/DELETE requests with custom headers and body. See status, timing, size, and response β plus copy as cURL.
Decode, inspect, and verify JWTs.
Decode JWT header and payload instantly. See expiry status, issued/not-before times, and verify HMAC (HS256/384/512) signatures locally.
Unix time, humanized.
Convert Unix timestamps to human-readable dates and back. Live current time, timezone selector, ISO 8601, RFC 2822, and relative time.
Convert between YAML and JSON.
Convert YAML to JSON and back β nested mappings, sequences, inline flow syntax, and comments all supported. Essential for Docker, Kubernetes, and CI/CD configs.
Strong passwords & passphrases.
Generate cryptographically secure passwords or memorable passphrases. Configurable length, character classes, entropy calculation, and bulk generation.
Beautify and minify SQL.
Format raw SQL queries with proper keyword casing and clause indentation, or minify to a single line. Covers ANSI/MySQL/PostgreSQL common syntax.
Diff two environment files.
Compare two .env files side by side β see keys only in one file, keys with different values, and generate a safe .env.example template.
Why DevTools?
No install, no login, no config. Open a tool and start working immediately.
Fully browser-based β Windows, Mac, Linux, mobile. Your data stays on your machine.
Every output generates a URL. Share your cron expression, regex, or JSON with one click.
Copy output as Node.js, Python, Linux, GitHub Actions, Docker β whichever stack you use.
Nothing is sent to our servers on the free tier. All processing runs in your browser.
New tools drop regularly. Pro subscribers get early access and shape the roadmap.
Pricing
All tools are free. Upgrade for saved workspaces, team sharing, and priority features.
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Everything in Pro Monthly, billed yearly. Save 2 months.
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Pay once. Every tool, every future release, forever.
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