Compress TOML Files Online — Browser-Only TOML Compressor

This TOML compressor shrinks .toml files such as Cargo.toml, pyproject.toml, Hugo and Netlify configs by removing comments, blank lines and extra spaces, and by joining multi-line arrays onto one line. Strings, numbers, dates and keys are never touched. Paste a file or open one and the result updates as you type. Each result is read back with a TOML parser and compared with your original, so you know the data is identical before you download it. If your TOML has a mistake, you’ll see the line and column.

How to compress a TOML file

1. Paste your TOML into the left box, use Open file, or drag the file onto the box.
2. Choose what to remove. Everything is on by default, and all of it is safe for TOML.
3. Open Changes to see removed lines in red, edited lines in amber, and array lines that were joined onto the line above in blue.
4. Open Check to confirm the data is unchanged, then copy, download the .toml, or download a .gz copy.

What each option does

Before and after

# Package details
[package]
name    = "my-app"
version = "0.3.1"   # bump before release
[dependencies]
serde = { version = "1.0", features = [ "derive" ] }
tokio = { version = "1", features = [
    "macros",
    "rt-multi-thread",
] }

With every option on, that becomes:

[package]
name="my-app"
version="0.3.1"
[dependencies]
serde={version="1.0",features=["derive"]}
tokio={version="1",features=["macros","rt-multi-thread",]}

What’s never changed

• Strings of every kind, including """ and ''' multi-line strings, character for character
• Numbers, booleans, and dates and times exactly as written, so 1_000, 0xFF and 1.0 stay that way
• Keys, including quoted keys, and the order of every table and key
• Table headers and arrays of tables like [[bin]]
• Line endings. Files with Windows CRLF line endings keep them.

Because the tool only removes spacing and comments between values, and never rewrites the values themselves, the result works with every TOML parser your original worked with. It was tested on hundreds of real TOML files and the full official toml-test suite.

Should you use the GZIP download?

GZIP usually makes a TOML file 30–60% smaller, which helps for backups and sending configs over slow links. But Cargo, pip, Hugo and other tools can’t read a .toml.gz file directly. Unzip it first (gunzip config.toml.gz on Linux and macOS, or 7-Zip on Windows). If you need a smaller config an app can load, use the regular .toml download.

Frequently asked questions