excel-rs-xlsx

A fast, low-allocation Rust library for writing XLSX (Excel Open XML) files.

excel-rs-xlsx is the core engine behind py-excel-rs and cli-excel-rs. It streams cell data directly into a ZIP-compressed XLSX archive, flushing to the underlying writer in batches — it never materialises the full file in memory.

Features

• Streams directly to any Write + Seek target (file, Cursor<Vec<u8>>, etc.)
• SIMD-accelerated XML escaping via memchr
• Compile-time column-letter lookup table (zero runtime allocation for A1 references)
• Supports strings, numbers, booleans, and dates
• Named worksheets
• Row/column/sheet limit enforcement matching the OOXML spec

Usage

use std::fs::File;
use excel_rs::{WorkBook, sheet::CellType};

let file = File::create("output.xlsx")?;
let mut wb = WorkBook::new(file);

let mut sheet = wb.new_worksheet("Sales".to_string())?;

// Write a header row (all strings by default)
sheet.write_row([b"Name".as_ref(), b"Revenue"].into_iter(), None)?;

// Write a data row with explicit type hints
sheet.write_row(
    [b"Alice".as_ref(), b"42000"].into_iter(),
    Some(&[CellType::String, CellType::Number]),
)?;

sheet.close()?;
wb.finish()?;

Limits

License

MIT