Are my files uploaded anywhere?

No. Every step of the Spreadsheet → Excel conversion happens locally on your device. The files never leave your browser — you can verify this in your network tab.

What's the maximum file size?

There is no hard cap. SwiftConvert is limited only by the memory available to your browser tab, so very large spreadsheet inputs may run slower on low-end devices.

Converters/Spreadsheet→Excel (.xlsx)

Spreadsheet to Excel Converter — free, in your browser

Best under 15 MB · Max 75 MB

.xlsx, .xls, .ods

Switch target

CSV JSON Excel (.xlsx)

Drop a spreadsheet or click to browse

.xlsx, .xls, .ods

Choose file

xlsxxlsods≤ 100 MB

About this converter

Spreadsheet → Excel

Spreadsheet → Excel — the fast, private way to turn Excel-style workbooks (.xlsx, .xls, .ods) into an Excel .xlsx workbook. Drag files in below and the converter runs entirely inside your browser tab. No sign-up, no upload, no size cap beyond what your device can handle.

All sheets are read; the first sheet is used unless you pick another.
Formulas are evaluated to their last-saved values.
Opens in Excel, Google Sheets, and Numbers with formatting intact.
Convert as many files as you like — each one triggers a direct download.

When to use this Spreadsheet to Excel converter

A dedicated spreadsheet-to-excel converter is the fastest option when you need a clean .xlsx file without installing software, signing up, or waiting for a server round-trip. Typical uses include moving spreadsheet content into excel (.xlsx) without opening a heavy desktop app. Because everything runs in your browser tab, you can convert one file or a whole batch on a work laptop, a shared computer, a Chromebook, or even a phone — anywhere a modern browser runs.

How SwiftConvert converts Spreadsheet to Excel

SwiftConvert uses well-tested open-source libraries compiled to run inside the browser. When you drop a spreadsheet file, it is parsed in memory, transformed into excel, and offered back to you as a direct download. No temporary copy is written to a server, no queue, no worker cluster — the CPU doing the work is the one in front of you. That means results are usually ready in seconds for small files, and speed scales with your device rather than someone else's free plan.

Tips for the best Excel output

For best results, start from a clean spreadsheet source: fewer nested layers, embedded fonts where possible, and reasonable file sizes convert most reliably. If a batch stalls, split it into smaller groups so the browser can free memory between runs. On mobile, close background tabs before converting very large files. If a specific Excel setting matters to you — resolution, quality, page size — check the options exposed above the drop zone; SwiftConvert exposes the knobs that actually change the output, and leaves the rest on sensible defaults.

How it works

1Drop one or more spreadsheet files into the drop zone above (or click to browse).
2SwiftConvert converts each file to Excel (.xlsx) locally, showing progress as it goes.
3Your Excel (.xlsx) downloads appear in the list — click any file to save it.
4Repeat with more files — history is kept for this session.

Frequently asked

Yes. SwiftConvert runs the Spreadsheet → Excel (.xlsx) conversion in your browser using open-source libraries. There's no server, no account, and no per-file limit.

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Index

All converters

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From Image

5

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5

From Word document

4

From Plain text

4

From Markdown

4

From HTML

6

From JSON

4

From CSV

3

From Spreadsheet

3

From YAML

2

From XML

2

From Audio

1

Audio → WAV