Developer, Cloud & Data Utilities
Instant browser-based developer utilities: JSON formatter, Base64, LLM token cost, CIDR subnet, SLA uptime, and CSS converters.
JSON Formatter, Beautifier, Minifier & Syntax Validator
Validate, pretty-print (2-space indent), and minify JSON payloads directly in your browser with zero server uploads.
Base64 String Encoder & Decoder Utility (UTF-8 Safe)
Encode plain UTF-8 text to Base64 or decode Base64 strings back to readable text instantly in your browser.
URL Percent Encoder & Query String Decoder (`encodeURIComponent`)
Safely encode or decode special characters in URLs and query parameters using RFC 3986 percent-encoding.
UUID v4 Bulk Generator (Cryptographically Random RFC 4122)
Generate cryptographically secure RFC 4122 UUID v4 identifiers in bulk for database keys and API request IDs.
Secure Password Generator & Shannon Entropy Bit Calculator
Generate high-entropy cryptographic passwords and calculate exact bits of entropy and brute-force crack time.
Unix Epoch Timestamp to UTC / ISO-8601 Date Converter
Convert Unix epoch seconds or milliseconds into human-readable ISO-8601 UTC dates and relative time offsets.
CSS PX to REM & EM Responsive Typography Unit Converter
Convert pixel (px) values into responsive CSS rem and em units based on your root html font-size (default 16px).
HEX to RGB, RGBA & CSS HSL Color Code Converter
Convert HEX color codes (#10B981) into CSS rgb(), rgba(), and relative luminance contrast values.
Linux Chmod Octal (755, 644) & Symbolic Permission Calculator
Convert Linux file permission octal digits (e.g. 755, 644, 600) into symbolic rwxr-xr-x notation and chmod commands.
IPv4 CIDR Subnet Mask & Usable Host Range Calculator
Calculate total IPv4 addresses, usable host IPs, and subnet mask from any CIDR prefix length (/8 to /32).
File Download & Data Transfer Time Calculator (Mbps / Gbps)
Calculate how long it takes to download or transfer large files (GB/TB) over any internet connection speed (Mbps).
Cloud Server Egress Bandwidth Cost & TB Transfer Calculator
Estimate monthly cloud bandwidth usage in Terabytes (TB) and compare AWS/GCP egress fees vs Cloudflare $0 egress.
SLA Uptime Percentage (99.9% vs 99.99%) Downtime Calculator
Calculate maximum allowed downtime per day, month, and year for 99.9% (Three Nines), 99.95%, and 99.99% SLA agreements.
SQL Database Storage, Index Overhead & IOPS Size Estimator
Estimate database table storage size in GB, B-Tree index overhead, and 3-year growth for PostgreSQL, MySQL, or D1.
AI LLM API Token Cost Calculator (Input & Output Pricing)
Calculate monthly AI API costs based on daily requests, prompt input tokens, completion output tokens, and per-1M token pricing.
Battery mAh to Watt-Hours (Wh) & Runtime Calculator
Convert battery capacity from milliamp-hours (mAh) to Watt-hours (Wh) and check TSA 100Wh airline carry-on compliance.
PC / Server 24/7 Electricity Cost & kWh Consumption Calculator
Calculate how much electricity a gaming PC, home lab server, or NAS consumes and costs per month and year.
RAID 0, 1, 5, 6 & 10 Usable Storage Capacity Calculator
Compare usable storage capacity, parity overhead, and drive failure tolerance across RAID 5, RAID 6, and RAID 10.
Monitor & Smartphone Screen PPI (Pixels Per Inch) Calculator
Calculate display pixel density (PPI), dot pitch in mm, and optimal Retina viewing distance for any screen size.
HTML Entity Encoder & XSS-Safe String Escaper
Escape raw HTML tags (<, >, &, quotes) into safe HTML entities for code snippets and XSS prevention.