Do my files get uploaded?

No. Every tool runs in your browser. The badge "Processed in your browser · nothing uploaded" appears only on tools where that is literally true, which today is all of them.

Then why do I need an internet connection?

To load the page and the tool's code. After that, processing works offline. A full offline mode (installable app) is on the roadmap.

Where does the exported file go?

It is saved by your browser like any download. Nothing is kept on our side.

How many files can I process for free?

8 exports per day, up to 500 MB each. The counter resets at midnight UTC. Opening, previewing and adjusting a file does not count — only exporting does.

Why is there a limit if nothing is uploaded?

It keeps the free tier sustainable and tells us how much demand there is for Plus. The limit is enforced softly; it is not a security boundary.

Very long files fail with a memory message. Why?

Effects that require decoding turn a compressed file into raw samples, which takes several gigabytes for hours of audio. Use the no-re-encoding cut for long files, or split them first.

Which formats can I export?

MP3 and WAV everywhere. M4A/AAC, FLAC and Opus depend on your browser's built-in encoders; the export menu shows only what your browser can produce.

Why can't I make an .m4r ringtone in Firefox?

Firefox has no AAC encoder. Use Chrome, Edge or Safari for .m4r, or export an MP3 ringtone.

Which browsers are supported?

Current Chrome, Edge, Firefox and Safari on desktop and mobile. Safari 17 or newer is needed for keeping files between tools.

Is there a paid plan?

Not yet. Plus is described on the pricing page; leave your email there and we will tell you when it launches. No account is needed for the free tools.

There is no password yet. The Sign in button opens a waiting list for Plus. Google / Apple login arrives with billing.

What happens if a charge goes wrong?

Nothing is charged today. The refund policy at /legal/refund explains the 14-day rule that will apply when Paddle is live.

AVI / WMV / FLV failed in the browser. Now what?

Those containers are sent to the server FFmpeg encoder (whitelist arguments only). If that job fails too, the file uses a codec we cannot decode — convert it to MP4 locally first.

The encoder said it was busy.

The 4 GB host runs one FFmpeg job at a time. Wait a few seconds and retry. Long 4K files may time out; trim first.

Camera or microphone was denied.

Use the padlock in the address bar and allow the permission, then reload. Recording never leaves this device.

Can I import from a URL?

Yes — paste a direct public http(s) link on the tool page. We block private/loopback addresses. Google Drive and Dropbox pickers need OAuth client IDs we do not have yet.

Found a translation error?

Use Contact and mention the language and the page. The language menu lists 16 locales; English and Simplified Chinese have full copy, the others fall back to English until we finish them.

Help

Short answers about privacy, limits, formats and browsers.

Privacy and processing

Do my files get uploaded?: No. Every tool runs in your browser. The badge "Processed in your browser · nothing uploaded" appears only on tools where that is literally true, which today is all of them.
Then why do I need an internet connection?: To load the page and the tool's code. After that, processing works offline. A full offline mode (installable app) is on the roadmap.
Where does the exported file go?: It is saved by your browser like any download. Nothing is kept on our side.

Limits

How many files can I process for free?: 8 exports per day, up to 500 MB each. The counter resets at midnight UTC. Opening, previewing and adjusting a file does not count — only exporting does.
Why is there a limit if nothing is uploaded?: It keeps the free tier sustainable and tells us how much demand there is for Plus. The limit is enforced softly; it is not a security boundary.
Very long files fail with a memory message. Why?: Effects that require decoding turn a compressed file into raw samples, which takes several gigabytes for hours of audio. Use the no-re-encoding cut for long files, or split them first.

Formats and browsers

Which formats can I export?: MP3 and WAV everywhere. M4A/AAC, FLAC and Opus depend on your browser's built-in encoders; the export menu shows only what your browser can produce.
Why can't I make an .m4r ringtone in Firefox?: Firefox has no AAC encoder. Use Chrome, Edge or Safari for .m4r, or export an MP3 ringtone.
Which browsers are supported?: Current Chrome, Edge, Firefox and Safari on desktop and mobile. Safari 17 or newer is needed for keeping files between tools.

Plans and account

Is there a paid plan?: Not yet. Plus is described on the pricing page; leave your email there and we will tell you when it launches. No account is needed for the free tools.
How do I sign in?: There is no password yet. The Sign in button opens a waiting list for Plus. Google / Apple login arrives with billing.
What happens if a charge goes wrong?: Nothing is charged today. The refund policy at /legal/refund explains the 14-day rule that will apply when Paddle is live.

Encoding and permissions

AVI / WMV / FLV failed in the browser. Now what?: Those containers are sent to the server FFmpeg encoder (whitelist arguments only). If that job fails too, the file uses a codec we cannot decode — convert it to MP4 locally first.
The encoder said it was busy.: The 4 GB host runs one FFmpeg job at a time. Wait a few seconds and retry. Long 4K files may time out; trim first.
Camera or microphone was denied.: Use the padlock in the address bar and allow the permission, then reload. Recording never leaves this device.
Can I import from a URL?: Yes — paste a direct public http(s) link on the tool page. We block private/loopback addresses. Google Drive and Dropbox pickers need OAuth client IDs we do not have yet.

Translations

Found a translation error?: Use Contact and mention the language and the page. The language menu lists 16 locales; English and Simplified Chinese have full copy, the others fall back to English until we finish them.

Something else? Write to hello@batonbox.com. Contact us