IT/Dev Calculators(21)
Color converter, timestamp, developer tools
Color Converter
Convert between HEX, RGB, and HSL color codes.
Unix Timestamp Converter
Convert between Unix timestamps and dates/times.
Base64 Encoder/Decoder
Encode and decode text in Base64 format.
JSON Formatter
Format or minify JSON data for readability.
URL Encoder/Decoder
Encode and decode URL strings.
Hash Generator
Generate MD5, SHA-1, SHA-256 hash values.
Regex Tester
Test regular expressions and view match results.
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text.
CSS Unit Converter
Convert CSS units.
Chmod Calculator
Calculate Unix file permissions.
IP Calculator
Calculate IP address and subnet info.
Cron Parser
Parse cron expressions.
JWT Decoder
Decode JWT tokens.
PX/REM Converter
Convert between px, rem, em, pt.
Markdown Preview
Check markdown text statistics.
Geo Distance Calculator
Calculate distance between two coordinates using Haversine formula.
Coordinate Converter
Convert between Decimal Degrees (DD) and DMS coordinates.
Midpoint Calculator
Calculate the geographic midpoint between two coordinates.
Bearing Calculator
Calculate bearing (direction) between two coordinates.
UTM Converter
Convert between WGS84 lat/lon and UTM coordinates.
GeoJSON Generator
Generate GeoJSON data from coordinates.
Overview
Our IT and developer tools collection provides essential conversion and utility tools for web developers, backend engineers, and system administrators. Streamline your design workflow with HEX, RGB, and HSL color code conversions, and simplify log analysis and API debugging with Unix timestamp to date conversions. Access everyday development essentials in one place, including Base64 encoding and decoding, URL encoding, JSON formatting, and regex testing. Verify data integrity with SHA-256 and MD5 hash generators, and quickly inspect token payloads using the JWT decoder. The collection also covers server operations and frontend development with CSS unit conversion, chmod permission calculation, IP subnet calculation, and cron expression parsing. For geospatial development, you will find coordinate-based distance calculation using the Haversine formula, UTM coordinate conversion, and GeoJSON generation tools.
Tips
- ✔When converting colors, the '#' prefix for HEX values is optional and will be recognized automatically. Use HEX codes when collaborating with designers, and HSL values when working in CSS for more intuitive hue and saturation adjustments.
- ✔Unix timestamps represent the number of seconds elapsed since January 1, 1970 00:00:00 UTC. You can distinguish millisecond timestamps (13 digits) from second timestamps (10 digits) by their length.
- ✔When formatting JSON, set indentation to 2 or 4 spaces for better readability. Formatted JSON makes it much easier to spot errors when debugging API responses or reviewing configuration files.
- ✔Keep a reference of frequently used regex patterns. Email validation (^[\w.-]+@[\w.-]+\.\w+$) and phone number extraction (\d{2,3}-\d{3,4}-\d{4}) are needed repeatedly in development.
- ✔Base64 encoding is not encryption. Anyone can easily decode it, so it is not suitable for protecting sensitive data. Use it for safely transmitting binary data as text, such as embedding images in HTML or sending file attachments in email.
- ✔When choosing a hash function, MD5 and SHA-1 are no longer recommended for security purposes. Use bcrypt or Argon2 for password storage, and SHA-256 or higher for data integrity verification.
- ✔In CSS unit conversion, 1rem is based on the root element font-size, which defaults to 16px. Using rem instead of px in responsive design improves both accessibility and scalability.
- ✔When calculating IP subnets, CIDR notation (/24, /16, etc.) lets you intuitively determine the network range. A /24 subnet contains 256 addresses, while a /16 subnet contains 65,536 addresses.
FAQ
Q. What are the differences between HEX, RGB, and HSL color codes?
HEX uses a six-digit hexadecimal value (e.g., #FF5733) and is the most widely used format in web development. RGB combines red, green, and blue values each ranging from 0 to 255, and the CSS rgba() function allows you to specify transparency as well. HSL consists of Hue (0 to 360 degrees), Saturation (0 to 100 percent), and Lightness (0 to 100 percent), making it ideal for intuitively adjusting brightness and saturation. All three formats represent the same colors in different ways, so you can choose based on your use case.
Q. What is a Unix timestamp and why is it used?
A Unix timestamp is an integer representing the number of seconds elapsed since January 1, 1970 00:00:00 UTC, also known as the Epoch. Because it represents a specific point in time as a single number regardless of time zone, it is the standard for server communication, database storage, API interactions, and logging. For example, 1700000000 represents November 14, 2023. While not human-readable, it makes time calculations and comparisons extremely simple.
Q. What is the structure of a JWT token?
A JWT (JSON Web Token) consists of three parts separated by dots. The Header contains the token type and signing algorithm, the Payload holds claim data such as user ID and expiration time, and the Signature includes a cryptographic signature to prevent tampering. Each part is encoded in Base64URL, so you can easily inspect the Header and Payload with a decoder. However, without verifying the Signature, you cannot guarantee the token's authenticity.
Q. How do I read chmod permission numbers?
The three-digit chmod number (e.g., 755) represents permissions for the owner, group, and others respectively. Each digit is the sum of read (r=4), write (w=2), and execute (x=1). For example, 755 grants the owner read, write, and execute (7), while the group and others get read and execute (5). Web server files are typically set to 644 (owner read-write, others read-only), and executable scripts are set to 755.
Q. What does /24 or /16 mean in CIDR notation?
In CIDR (Classless Inter-Domain Routing) notation, the number after the slash indicates the number of network prefix bits. With /24, the upper 24 bits serve as the network address, and the remaining 8 bits (2^8 = 256) are used for host addresses. So 192.168.1.0/24 represents a network containing 256 IP addresses from 192.168.1.0 to 192.168.1.255. A smaller number indicates a larger network range: /16 includes 65,536 addresses, and /8 includes roughly 16.77 million addresses.
Q. How do I write a cron expression?
A cron expression consists of five fields (minute, hour, day of month, month, day of week) separated by spaces. For example, '0 9 * * 1-5' means every weekday at 9 AM, and '*/15 * * * *' means every 15 minutes. The asterisk (*) means all values, comma (,) lists multiple values, hyphen (-) defines a range, and slash (/) sets an interval. Cron is widely used to automate recurring tasks such as server backups, data collection, and report generation. After writing an expression, it is best to verify the next execution times with a parser.
Q. When should I use hash functions like MD5 and SHA-256?
Hash functions are one-way functions that convert input data into a fixed-length unique string. They are used for verifying file integrity after download, storing password hashes instead of plain text, and detecting data duplicates. MD5 (128-bit) is fast but has known collision vulnerabilities, making it unsuitable for security purposes. SHA-256 (256-bit) is the currently recommended standard. The same input always produces the same hash, but reversing a hash to recover the original data is computationally infeasible.
Related Categories
Mathematical calculations such as base conversion and bitwise operations are frequently needed in programming, and using math calculators alongside developer tools helps with algorithm design and performance optimization.
Unit conversions such as CSS units and coordinate systems are common in IT development, and using general unit converters in parallel lets you efficiently handle transformations between various data formats.
Scientific tools for coordinate conversion and distance calculation are closely related to the geospatial tools in the IT category, making them useful together for research and data analysis.
IT developer tools are essential for business operations including data analysis, API integration, and automation scripting, and combining them with business calculators boosts workplace productivity.