All tools

Every tool runs locally, offline. Inputs are pasted text — outputs are instant.

Core (free forever)

Tool	What it does	Try
Color	RGB ⇄ HEX ⇄ HSL ⇄ CMYK	`#3b82f6`
Format	JSON ⇄ YAML ⇄ TOML ⇄ CSV	`{"name":"Ada"}`
URL	encode / decode	`https://example.com/?q=hello world`
HTML	entity encode / decode	`<a>Tom & Jerry</a>`
UUID	generate & reformat	(empty = generate)
Charset	text ⇄ bytes	`Hello, world`
Calendar	Gregorian ⇄ lunar & religious	`2025-03-15`
Chinese	Simplified ⇄ Traditional	`汉字转换`
Pinyin	汉字 → pinyin	`你好世界`
Romaji	かな ⇄ romaji	`こんにちは`
Phone	E.164 ⇄ national	`+1 (212) 555-0123`
MGRS	MGRS ⇄ lat/lng	`18S UJ 22764 14186`
Geodesic	distance & bearing	`40.7128,-74.0060 51.5074,-0.1278`
UTM	lat/lng ⇄ UTM zone	`38.9587, -77.0455`
Web Mercator	lat/lng ⇄ EPSG:3857	`38.9587, -77.0455`
DMS	decimal ⇄ deg/min/sec	`38.9587, -77.0455`
Geohash	lat/lng ⇄ geohash	`42.6, -5.6`
Plus code	lat/lng ⇄ OLC	`40.7128, -74.0060`
CRS	reproject coordinate systems	`48.8566 2.3522 EPSG:4326 EPSG:2154`
Geometry	area, buffer, overlay	`{"type":"Polygon",…}`
JWT	decode & verify	`eyJhbGciOi…`
Hash	md5, sha, blake…	`hello`

Tool packs: the 29 tools ship as 12 installable packs. Add only what you use in Settings → Packs.