Providers & API keys
VoxMark doesn’t transcribe on its own servers. It sends your audio to a service you choose, using your own API key, and that service bills you directly. VoxMark never handles payment.
The three services
Section titled “The three services”| Service | Good for | Get a key |
|---|---|---|
| Groq Whisper | Free tier, and the fastest of the three. The best start for most voiceovers. | console.groq.com/keys |
| OpenAI Whisper | Whisper from OpenAI. Billed per minute of audio. | platform.openai.com/api-keys |
| AssemblyAI | Several speakers, and long recordings. The only one that identifies speakers. | assemblyai.com/dashboard/api-keys |
The Service menu marks any service without a key as (no api key set), and the line under it reminds you what each one is good for.
File-size limits
Section titled “File-size limits”VoxMark uploads your audio file as it is — it doesn’t convert it first — so the limit is on the size of the file you drop in. (A WAV with leading silence is trimmed before upload, which makes it a little smaller.)
| Service | Largest upload |
|---|---|
| Groq | 25 MB on the free tier · 100 MB on the developer tier |
| OpenAI | 25 MB |
| AssemblyAI | Around 2 GB |
How much audio that is depends on the format. Uncompressed audio is large: a minute of 48 kHz, 24-bit stereo WAV is about 17 MB, so a long WAV is over 25 MB within a couple of minutes. An MP3 or M4A of the same voiceover is a fraction of the size — export one if your provider’s limit is tight, or use AssemblyAI, which has no practical limit.
VoxMark checks the size before it uploads. If the file is over your provider’s limit, it says so and stops, rather than letting the upload fail. Groq keys can be on either tier and VoxMark can’t tell which, so past 25 MB it warns that the file will only go through on the developer tier. Between 1 GB and 2 GB, AssemblyAI uploads go ahead with a warning that they may be slow.
Adding or changing a key
Section titled “Adding or changing a key”- On the Transcribe tab, choose the Service.
- Click Set / Update key.
- Paste the key and click Save.
In the key window:
- The field opens empty — none of your saved key is shown; the line above says whether a key is saved. Show reveals the saved key for a few seconds, then clears the field again.
- Get key… opens the provider’s API-key page in your browser.
- Save stores what you pasted. Leaving the field unchanged, or empty, keeps the key you had.
Where keys are stored
Section titled “Where keys are stored”Keys are stored in the Chroma preferences on your computer, in Cinema 4D’s preferences
folder. They are private to this computer and your user account; they aren’t saved in your
scenes, so sending a .c4d to someone never sends your key. Each person, and each computer,
needs their own key.
If you also use other Chroma plugins through the Chroma Plugin Manager, the same keys appear in Cinema 4D’s Preferences under the Chroma section. VoxMark’s Edit ▸ Preferences menu in the panel opens Cinema 4D’s Preferences there.