QR Code Generator
Instantly convert URLs, text, or contact info into QR codes and download as PNG
Free dev & design tools that run right in your browser
Media & Image
4AI Image Generator
Enter a prompt and AI will generate an image instantly
OG Image Generator
Generate social preview (OG) images instantly with text and colors
Video → GIF Converter
Convert video to GIF right in your browser with no upload. Uses WebCodecs hardware acceleration first and your file never leaves the device.
Data & Format
8JSON Formatter
Beautify · minify · validate JSON
Base64 Encoder/Decoder
Encode or decode Base64 text
YAML ↔ JSON Converter
Paste YAML or JSON and instantly convert between them. Auto-detection or manual mode.
CSV ↔ JSON Converter
Convert CSV to JSON or JSON to CSV
Number Base Converter
Convert between binary, octal, decimal, and hex
JSONPath Query
Query JSON data with JSONPath expressions and explore results
JSON to TypeScript Converter
Paste JSON and instantly get TypeScript interfaces or type aliases.
TOML ↔ JSON Converter
Paste TOML or JSON and instantly convert between them. Auto-detection or manual mode.
Text
8Lorem Ipsum Generator
Generate Lorem Ipsum dummy text
Korean Choseong Extractor
Extract Korean initial consonants
Case Converter
Convert text into camelCase, snake_case, kebab-case and 9 naming styles at once
HTML Entity Encoder/Decoder
Encode HTML special characters to entities · decode entities back
Text Diff
Paste two texts and see the differences highlighted by line, word, or character
Korean Typo Converter
Convert accidental English-keyboard typing back to correct Korean (Dubeolsik layout)
Number to Korean Amount
Convert numbers to Korean amount notation for contracts and official documents.
Markdown Preview
Write Markdown and preview the rendered output in real time
Dev & Security
9Password Generator
Random password with strength meter
Hash Generator
Generate SHA hash instantly · copy
JWT Decoder
Parse JWT header · payload · signature instantly
Regex Tester
Test regex patterns with real-time match highlighting
chmod Permission Calculator
Pick Unix file permissions with checkboxes and get octal (755) and symbolic (rwxr-xr-x) instantly
File Hash Checker
Instantly compute SHA-256, SHA-512, or SHA-1 hash of any file or text, and verify against an expected value. Files are processed entirely in your browser.
UUID Generator
Generate UUID v4 (random) or v7 (time-sorted)
IP Subnet Calculator
Calculate IPv4/IPv6 subnet information from CIDR notation
Cron Expression Builder
Visually build cron expressions and preview upcoming fire times
Color & Design
5Color Converter
HEX · RGB · HSL · OKLCH converter
CSS Shadow Builder
Visually design box-shadow values with sliders.
Color Palette Generator
Generate OKLCH-based complementary, triadic, analogous, and tetradic palettes and export as CSS variables.
CSS Gradient Generator
Visually edit CSS linear/radial/conic gradients and instantly copy the CSS or Tailwind code.
WCAG Contrast Checker
Enter foreground and background colors to calculate the WCAG 2.1 contrast ratio and check AA/AAA compliance instantly.
AI
3Time & Units
4Unit Converter
Length · weight · temp · area · data
World Clock
See the current time in cities around the world
Timestamp Converter
Convert Unix timestamp ↔ ISO date instantly
Shared Timer
Set an end time and get a shareable timer link. Count down to weddings, launches, sales, and deadlines with anyone in real time
Web & Network
4URL Encoder/Decoder
URL percent-encode · decode · query string parsing with full Unicode support
URL Shortener
Shorten long URLs into compact shareable links. Stored for 30 days via Cloudflare KV
My Network Info
See your public IP address, country, city, ASN, and which Cloudflare datacenter is serving you — detected by Cloudflare Workers
URL Parser & Editor
Break down a URL into its components, edit them individually, and reassemble. Supports adding and removing query parameters.
Games & More
5Site Guide
AI guide for xiyo.dev — site overview · lab tool links
Reaction Speed Test
Test your click reaction time. Check your rating based on 5 attempts average.
Typing Speed Test
Measure your typing speed in Korean and English. Check your WPM, accuracy, and CPM.
Mini Memo
Save text and share it via URL. Automatically deleted after the expiration period.
XIYO Survivors
Survive 15 minutes against endless monster hordes in this 3D roguelike. Auto-attacking weapons, permanent upgrades, cloud saves, and up to 4-player co-op multiplayer.