Properties to YAML Converter

.properties → YAML. Dotted keys expand into nested mappings, indexed keys such as app.clients[0].name become sequences, and \uXXXX escapes are decoded.

application.properties# Spring Boot
spring.application.name=checkout-service
spring.profiles.active=production

spring.datasource.url=jdbc:postgresql://db.internal:5432/checkout
spring.datasource.username=checkout
spring.datasource.hikari.maximum-pool-size=20

server.port=8080
server.servlet.context-path=/api

management.endpoints.web.exposure.include=health,info,metrics

app.clients[0].name=mobile
app.clients[0].timeout=2500
app.clients[1].name=partner
app.clients[1].timeout=8000

app.welcome=Hello, \u00c9milie

application.ymlspring:
  application:
    name: checkout-service
  profiles:
    active: production
  datasource:
    url: jdbc:postgresql://db.internal:5432/checkout
    username: checkout
    hikari:
      maximum-pool-size: 20
server:
  port: 8080
  servlet:
    context-path: /api
management:
  endpoints:
    web:
      exposure:
        include: health,info,metrics
app:
  clients:
    - name: mobile
      timeout: 2500
    - name: partner
      timeout: 8000
  welcome: Hello, Émilie

Properties to YAML Converter — Free Online Tool

Converts a Java .properties file into YAML by expanding dotted keys into nested mappings and collapsing indexed keys (servers[0].host) into sequences, honoring comments, colon separators, line continuations and escaped Unicode, useful for migrating a Spring Boot application.properties to application.yml without rewriting the hierarchy by hand.

How to use the Properties to YAML Converter

Open the tool above — it runs entirely in your browser, so your input never leaves this page.
Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
Copy the result from the output area with the copy button orCtrl/Cmd + C.
No signup, no upload, and no tracking — repeat as often as you need.

Frequently asked questions

Does this handle a Spring Boot application.properties?

Yes — that is the main use. Dotted keys such as spring.datasource.hikari.maximum-pool-size expand into the nested application.yml hierarchy, and indexed keys such as app.clients[0].name become a YAML sequence.

Are comments carried over?

No. YAML supports comments but the parse step discards them, because a comment in .properties has no unambiguous position in the resulting tree. Re-add the important ones after converting.

What about \uXXXX escapes and line continuations?

Both are handled. Java .properties files are Latin-1 by convention, so non-ASCII text is escaped as \uXXXX — those are decoded back to real characters, and a value split across lines with a trailing backslash is rejoined before parsing.

Free & private — why use this Properties to YAML Converter

The Properties to YAML Converter runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.

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