# Compress XLSX

> Compress Microsoft Excel Workbook (XLSX) files online for free. The compressor shrinks the embedded photos and repacks the document at maximum compression; text and layout are untouched. Processed in an isolated cloud sandbox and deleted automatically. Or set an exact target size.

URL: https://www.converterrr.com/compress-xlsx

- Compression: lossy, runs in an isolated cloud sandbox (deleted automatically).
- API: `POST /api/v1/jobs` with `"operation": "compress"` and an optional `compression_level` or `target_size` (paid plans).
- Format: [XLSX converter](https://www.converterrr.com/xlsx-converter), [Compress documents](https://www.converterrr.com/compress-documents).

## What compression does to XLSX

Shrinks the embedded photos and repacks the document at maximum compression; text and layout are untouched.

- **Light:** Gentle: images are recompressed but stay close to the original; good for print.
- **Balanced (default):** The default: images are optimised for reading on screen, usually with no visible difference.
- **Strong:** Smallest file: images are downsampled further; fine on screen, not for print.

## How to compress XLSX

1. **Add your XLSX files.** Drag and drop XLSX files onto the compressor, paste them, or click to browse. You can add several at once.
2. **Pick a level or a target.** Balanced is selected and suits most files. Choose Light to stay closer to the original or Strong for the smallest file, or set a target size or a percentage to reduce by.
3. **Compress.** Click Compress. Files are processed in an isolated cloud sandbox and are usually ready in seconds.
4. **Download.** Download each smaller XLSX, or everything at once as a ZIP.

## Good to know

- Workbooks are ZIP-compressed XML already. If a file is big because of pictures or pasted screenshots, compression helps a lot; if it's big because of many rows of data, the savings are modest.
- Formulas, formatting, charts and data are untouched.
- Need to meet an upload limit? Set a target size (or a percentage to reduce by) in the compressor and the workbook is compressed to fit.
- XLSX files are compressed in an isolated cloud sandbox created just for your job; the upload and the result are deleted automatically afterwards.

## About the XLSX format

XLSX is the modern Excel workbook format with formulas, multiple sheets, charts and formatting.

|  | XLSX |
| --- | --- |
| Full name | Microsoft Excel Workbook |
| Type | Spreadsheet |
| Extensions | .xlsx |
| MIME type | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| Best for | spreadsheets in Excel, Google Sheets and Numbers |
| Properties | open standard |

## Compress other documents

[Compress PDF](https://www.converterrr.com/compress-pdf), [Compress DOCX](https://www.converterrr.com/compress-docx), [Compress PPTX](https://www.converterrr.com/compress-pptx), [Compress ODT](https://www.converterrr.com/compress-odt), [Compress ODP](https://www.converterrr.com/compress-odp), [Compress ODS](https://www.converterrr.com/compress-ods), [Compress EPUB](https://www.converterrr.com/compress-epub)

## Compressing XLSX: frequently asked questions

### How do I compress an XLSX file?

Drop the XLSX onto the compressor above, keep Balanced or pick another level, and click Compress. Download the smaller XLSX when it's done; it usually takes a few seconds.

### Does compressing XLSX reduce quality?

A little, by design: XLSX is a lossy format. Balanced is tuned to look the same for most uses; choose Light if you want to stay closer to the original.

### How much smaller will my XLSX get?

Workbooks with pictures shrink well; data-only workbooks are already compressed XML and change little.

### Can I compress XLSX to a specific size?

Yes. Set a target size in the compressor, or a percentage to reduce by, and the file is compressed to land at or just under it.

### Is it safe to compress XLSX files here?

Yes. Your file travels over an encrypted connection to an isolated sandbox created for your job only, and both the original and the result are deleted automatically.

### Is the XLSX compressor free?

Yes. Cloud jobs like this one use the same free daily credits as cloud conversions, and there's no watermark.