How File Processing Works - FileFormer

Learn how FileFormer runs every tool entirely in your browser, with no uploads, no server step, files that never leave your device, and safe file-use choices.

Free online file converter tool. Works in Chrome Firefox Safari Edge Opera and other modern browsers on Windows macOS Linux Android and iOS. No software installation or sign-up required. All conversions run directly in your browser, so your files never leave your device. Free to use with no account needed.

How File Processing Works

FileFormer runs entirely in your browser. Every conversion and compression happens on your own device using JavaScript, WebAssembly, and modern web APIs, so your files are never uploaded to a server.

Everything runs in your browser

All tools -- from JSON formatting, Base64 encoding, and text utilities to image, audio, video, document, and archive conversion -- run directly in your browser. Your file stays on your device the whole time. Nothing is sent to our servers, no account is needed, and there is no server step.

Your files are never uploaded

Because processing is fully client-side, your files are not transferred over the network, stored, or seen by us at any point. The conversion runs locally and the result is made available for download right in your browser. We cannot retain, inspect, or reuse your files because they never reach us.

Private by design

Since files never leave your device, there is nothing for us to store, log, or analyze. We do not use your files for training, advertising, or analytics -- they simply stay with you.

Accounts and access

No sign-up is required to use any tool on the site. We do not require email, identity verification, or payment to convert or compress files. If you encounter a tool that asks for any of those, treat it as a bug and let us know at editorial@fileformer.com.

File size and workflow limits

Because everything runs locally, practical limits depend on your device's memory and processing power rather than any server cap. Very large files may run slowly on lower-end hardware. There are no paid tiers and no throttling.

Sensitive files

FileFormer is well suited to documents containing personal, medical, financial, legal, or otherwise sensitive information, because those files stay on your device and are never uploaded. We still do not provide formal compliance attestations such as HIPAA, SOC 2, or comparable frameworks, so use your own judgment for regulated workflows.

Questions and contact

Editorial and product questions go to editorial@fileformer.com. We respond to questions about how a specific tool processes files, what data is retained, and how to verify the workflow before uploading anything.

Frequently asked questions

Do all tools run in my browser?

Yes. Every tool runs entirely in your browser, including video, PDF, audio, image, and archive conversions. Your files are never uploaded to a server.

Do I need an account?

No. There is no account, sign-up, or payment requirement to use any tool.

Are there file size limits?

Limits depend on your device's memory and processing power rather than any server cap, since everything runs locally. Very large files may run slowly on lower-end hardware.

Are my files safe to process here?

Your files never leave your device, so they are not uploaded, stored, or seen by us. That makes the tools well suited to sensitive documents, though we do not provide formal compliance attestations such as HIPAA or SOC 2.

What happens after processing?

Your converted file is available for immediate download right in your browser. Nothing is sent to or stored on a server, so there is no copy of your file anywhere but your own device.