CSV to TOML — Free Online Converter with Table Editor

What Is TOML?

TOML (Tom's Obvious Minimal Language) is a configuration file format created by Tom Preston-Werner in 2013. It is designed to be unambiguous, human-readable, and easy to parse. TOML files use the .toml extension.

[database]

host = "localhost"

port = 5432

name = "myapp"

enabled = true

[server]

host = "0.0.0.0"

port = 8080

workers = 4

TOML Syntax

Where TOML Is Used

TOML vs. YAML vs. JSON vs. INI

Why Convert CSV to TOML?

TOML Type Mapping from CSV

Core Features

1. Online Table Editor

After loading CSV data, an interactive spreadsheet grid lets you edit before converting:

2. Privacy by Design

All processing runs entirely in your browser. No data is uploaded to any server.

How to Use This Tool — Step-by-Step

Step 1: Load CSV Data

Choose one of two input methods:

• Upload a file: Click "Choose File" and select a .csv file.

• Paste data: Click "Enter Data" to switch to the code editor. Paste your CSV.

Step 2: Edit in Table Editor (Optional)

Use the toolbar to clean your data:

• Remove duplicates (Deduplicate)

• Remove empty rows/columns (Delete Empty)

• Find and replace values (Replace)

• Transform text case

• Transpose rows and columns

Step 3: Convert

Click Convert. The TOML output appears in the "Output Data" panel.

Step 4: Copy or Download

• Click Copy to Clipboard to paste into your .toml file.

• Premium users can click Download File to save.

Complete Example

Example — Database Configuration

Input CSV:

key,value

host,localhost

port,5432

name,myapp_production

enabled,true

pool_size,10

timeout,30

Output:

host = "localhost"

port = 5432

name = "myapp_production"

enabled = true

pool_size = 10

timeout = 30

Example — Rust Dependencies (Cargo.toml)

Input CSV:

name,version

serde,1.0

tokio,1.35

reqwest,0.11

tracing,0.1

clap,4.4

Output:

name = "serde"

version = "1.0"

Note: For Cargo.toml dependencies, you would reorganize the output into TOML table format:

[dependencies]

serde = "1.0"

tokio = "1.35"

reqwest = "0.11"

tracing = "0.1"

clap = "4.4"

Example — Application Settings

Input CSV:

section,key,value

database,host,localhost

database,port,5432

database,name,myapp

server,host,0.0.0.0

server,port,8080

server,workers,4

logging,level,info

logging,file,/var/log/app.log

After transposing and editing, output:

[database]

host = "localhost"

port = 5432

name = "myapp"

[server]

host = "0.0.0.0"

port = 8080

workers = 4

[logging]

level = "info"

file = "/var/log/app.log"

Example — Environment Variables

Input CSV:

variable,value

DATABASE_URL,postgres://localhost/myapp

REDIS_URL,redis://localhost:6379

SECRET_KEY,abc123xyz

DEBUG,false

MAX_CONNECTIONS,100

Output:

DATABASE_URL = "postgres://localhost/myapp"

REDIS_URL = "redis://localhost:6379"

SECRET_KEY = "abc123xyz"

DEBUG = false

MAX_CONNECTIONS = 100

TOML Best Practices

Frequently Asked Questions (FAQ)

• Does the tool upload my data to the server?

  No. All conversion happens locally in your browser using JavaScript. Your data never leaves your device.

• What is TOML?

  TOML (Tom's Obvious Minimal Language) is a configuration file format designed to be human-readable and unambiguous. It is used by Rust (Cargo.toml), Python (pyproject.toml), Hugo, and many other tools.

• What is the difference between TOML and YAML?

  TOML uses explicit section headers ([section]) and requires quoted strings. YAML uses indentation for structure and supports more complex features. TOML is less ambiguous; YAML is more expressive. Both are used for configuration.

• What is the difference between TOML and INI?

  TOML supports typed values (integers, floats, booleans, arrays, datetime), nested tables, and has a formal specification. INI only supports string values with no formal spec. TOML is a strict superset of INI's capabilities.

• Can I use the output in Cargo.toml?

  The tool generates flat TOML key-value pairs. For Cargo.toml, you may need to reorganize the output into the expected [package] and [dependencies] table structure.

• Can I edit the data before converting?

  Yes. The built-in table editor lets you modify cells, transpose, deduplicate, find/replace, change case, and insert/delete rows and columns before generating TOML.

• What CSV formats are supported?

  Standard CSV with comma delimiters. The first row can be used as column headers (enable "First Row as Header").

• Is there a file size limit?

  The tool processes data entirely in your browser. Files up to 10 MB typically convert without issues on modern hardware.

• Can I use this on mobile?

  Yes. The tool is responsive, though the table editor is best experienced on desktop.