convert.com.de
Free to start · Works offline

Convert anything, offline.

Math, units, text, data, time, color, geo — paste anything, get answers in milliseconds. No ads.

Download

Made for developers, analysts & students.

Private by design — nothing leaves your device.

offline
Math
Inputevaluate any math
Result
6.6666666667
By the numbers

One app, every conversion

Tools
29
Tool packs
12
Works offline
100%
MathUnitsBase64GeoColorTimestampsCJK textPhonesCalendarsUUIDHTMLURLMathUnitsBase64GeoColorTimestampsCJK textPhonesCalendarsUUIDHTMLURL
29 tools

Pick a tool, paste, done.

Try Math live above. Everything else is one free download away.

Math
evaluate any math
(2 + 3) * 4 / (1 + 2)
Unit
convert units
5 km mi
Base64
encode / decode
convert.com.de consolidates conversion APIs
Slugify
URL-safe strings
Hello, World! → This is great
Case
camelCase, snake_case…
convertComDeConsolidatesApis
Number base
dec ⇄ hex ⇄ bin ⇄ oct
255
Timestamp
unix ⇄ ISO ⇄ local
1704067200
Color
RGB ⇄ HEX ⇄ HSL ⇄ CMYK
#3b82f6
Format
JSON ⇄ YAML ⇄ TOML ⇄ CSV
{"name":"Ada","langs":["ts","rust"]}
URL
encode / decode
https://example.com/?q=hello world&lang=en
HTML
entity encode / decode
<a href="x">Tom & Jerry</a>
UUID
generate & reformat
Charset
text ⇄ bytes
Hello, world
Calendar
Gregorian ⇄ lunar
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
MGRS
MGRS ⇄ lat/lng
18S UJ 22764 14186
Geodesic
distance & bearing
40.7128,-74.0060 51.5074,-0.1278
UTM
lat/lng ⇄ UTM zone
38.958730, -77.045519
Web Mercator
lat/lng ⇄ EPSG:3857
38.958730, -77.045519
DMS
decimal ⇄ deg/min/sec
38.958730, -77.045519
Geohash
lat/lng ⇄ geohash
42.6, -5.6
Plus code
lat/lng ⇄ OLC
40.7128, -74.0060
CRS
reproject coordinates
48.8566 2.3522 EPSG:4326 EPSG:2154
Geometry
area, buffer, overlay
{"type":"Polygon",…}
Phone
E.164 ⇄ national
+1 (212) 555-0123
JWT
decode & verify
eyJhbGciOi…
Hash
md5, sha, blake…
hello
Thermo
fluid saturation & density
water 100 c psat
Local API

Every format. One local API.

Fluent in the formats you use. Scriptable from anything, over localhost.

Plus CSV, TOML, Shift-JIS, Hebrew & Islamic calendars, UTM, DMS and 20 more — see all tools. Tap a format to preview its API call.

Automate the boring parts.

Pipe any conversion into your workflow — all 29 tools answer on localhost.

  • ✓ POST /v1/convert · GET /v1/tools
  • ✓ Same tools as the app — nothing new to learn
  • ✓ Secured with your license key

Read the Local API docs →

curl — unit · km → mi
Pricing

One key. Every tool.

Core tools are free forever. One key unlocks the rest.

Core

Everyday conversions.

Free
  • 7 core tools, math & units
  • History & favorites
  • Offline, no account
Download free
Best value

Pro

Every tool, one key.

$49$29 / year

Founding members lock $29/yr for life. Billed yearly, cancel anytime.

  • All 29 tools
  • API + CLI access
  • All updates included
Get license key

Enterprise

For companies & orgs.

Custom
  • Volume keys from 5 seats
  • Offline installer
  • Priority support
Chat with us

Founding prices for the first 1,000 — then they go up. Pro starts with a 7-day trial.

FAQ

Common questions.

Yes — everything runs on your machine. No cloud, no tracking, no uploads.

Get the app

Stop Googling “X to Y”.

Download free. Pro starts with a 7-day trial — $29/yr founding for the first 1,000.

Download for Mac Windows

~4 MB · Mac & Windows · auto-updates