Free Developer Tools
17 browser-based tools for developers. No signup, no tracking, nothing leaves your device.
Browse all tools ↓Why Punchbit?
100% Browser-Based
Every tool runs entirely in your browser. Your data never touches a server. No uploads, no processing queues, no privacy concerns.
No Account Required
No signup, no login, no email. Open a tool and start working. Your favorites and preferences are saved locally in your browser.
Always Free
Every tool is completely free with no usage limits. Supported by non-intrusive native ads — no popups, no tracking.
Time & Dates5 tools
Convert timestamps, measure the gap between two dates, add or subtract days, and compare timezones.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. See current time, relative time, and multiple date formats with live updates.
Timestamp Difference Calculator
Find the exact gap between two timestamps or dates. Paste Unix time, ISO 8601, or plain dates and read the answer in years, days, hours, minutes, and seconds.
Date Calculator — Add or Subtract Time
Add or subtract days, weeks, months, and years from any date. Skip weekends for business-day math and copy the result as a date or a Unix timestamp.
Timezone Converter & Meeting Planner
Convert one time across many timezones at once. Compare working hours side by side, see UTC offsets, and get a shareable meeting time.
Duration Converter (Seconds, Minutes, Hours)
Convert any duration between milliseconds, seconds, minutes, hours, days, and weeks. Reads human formats like 1h 30m and clock formats like 01:30:00.
Cron & Schedules4 tools
Write a schedule in plain English, read one back, build one field by field, and port it to any platform.
Cron Expression Parser
Parse and explain cron expressions in human-readable format. See next run times and use preset templates for common schedules.
Natural Language to Cron Generator
Describe a schedule in plain English and get a valid cron expression. Type 'every weekday at 9am' and see the expression, what it means, and the next run times.
Visual Cron Expression Builder
Build a cron expression by picking minutes, hours, days, and months from menus. No syntax to remember — the expression and its next runs update as you click.
Cron Converter — Quartz, AWS, Kubernetes
Convert a standard cron expression into Quartz, AWS EventBridge, GitHub Actions, Kubernetes CronJob, and systemd timer syntax, with the gotchas spelled out.
Everything else
JSON Formatter & Validator
Format, validate, and minify JSON data with syntax highlighting and error detection. Paste any JSON and instantly see it formatted with proper indentation.
Regex Tester & Debugger
Test regular expressions with live matching, capture groups, and flag support. See matches highlighted in real-time as you type.
JWT Decoder & Inspector
Decode and inspect JSON Web Tokens. View the header, payload, and check expiration status without any external libraries.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 strings back to plain text. Handles UTF-8 characters correctly.
UUID Generator
Generate cryptographically random v4 UUIDs. Bulk generate up to 100 at once with one-click copy.
Hash Generator (SHA-256, SHA-512)
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic hashes from any text input.
Text Diff Checker
Compare two texts side by side with color-coded differences. See additions, deletions, and changes highlighted line by line.
Color Converter (HEX, RGB, HSL)
Convert between HEX, RGB, HSL, and CSS color formats. Live preview with a color picker and one-click copy for all formats.