File Size Converter — Browser File Utility

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File Size Converter is a browser-based file utility that converts bytes into kb, mb, gb, kib, and mib units.

File Size Converter

Local processingUnsupported formats or browser encoders are shown as clear errors.

Runs in your browser

Selected files and input are not uploaded to a server. Preview, conversion, hashing, and download file creation run in this browser session.

Supported input: Byte value of 0 or greater
Output: KB, MB, GB, KiB, MiB
Max file size: 25.00 MB
Max pixels: 32,000,000 px

Bytes

File size

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What is it

File Size Converter processes files or filename lists in your browser without uploading them to a server. It uses standard web APIs such as Web Crypto, Blob, and string normalization to check hashes, sizes, and cleaned filename plans quickly.

convertedSize = bytes / unitBase^unitPower

How to use

1Choose a file or enter a base value.
2Press calculate or clean.
3Read the converted values in the result table.

Reference

File Size Converter — Browser File Utility Reference
Input	Result
file or filename	converts bytes into KB, MB, GB, KiB, and MiB units

Sources & standards

MDN Web Docs: Client-side web APIs - MDN Web Docs

FAQ

Is the File Size Converter file uploaded to a server?

No. This tool processes files and input in your browser and does not upload them to a server.

Can I use the File Size Converter result directly?

Hashes and sizes are browser-calculated values. Filename cleanup is a safe default rule example; adjust it when your organization has a specific naming policy.