How to Get a Free AssemblyAI API Key in 2 Minutes (Step-by-Step Guide)
Getting your free AssemblyAI API key takes about 2 minutes, requires no credit card, and works with the UD Tools Audio to SRT Converter right away. Below is the exact, screenshot-by-screenshot process so you never get stuck on this step again.
Quick Answer
Go to assemblyai.com, sign up for free (Google signup is fastest), open Manage → API Keys, create a new key, copy it, and paste it into the Audio to SRT Converter on UD Tools. No card. No hidden fee. You get 100 free transcription hours every month.
Why Does This Tool Need an API Key?
UD Tools' Audio to SRT Converter does not use a fake demo or a shared, limited engine. Instead, it connects directly to AssemblyAI's real AI transcription engine using your own personal API key. This design choice exists for one simple reason: honesty and quality.
Because you use your own key, there is no middleman limiting your usage, no watermark added to your subtitles, and no queue shared with thousands of other users. You get AssemblyAI's genuine 100 free hours every month, and your key is used only to talk directly to AssemblyAI's servers — it never passes through or gets stored on UD Tools' server.
Step-by-Step: How to Create Your Free AssemblyAI API Key
Follow these 10 steps in order. Each step below matches exactly what you will see on your own screen.
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1
Click the API Key section inside the tool
Inside UD Tools' Audio to SRT Converter, find the API Key section and click on it. This takes you straight to assemblyai.com so you don't have to search for it yourself.
Step 1 — Opening AssemblyAI from inside the UD Tools converter.
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2
Click "Sign Up For Free"
Once the AssemblyAI website opens, click the "Sign Up For Free" button to start creating your account.
Step 2 — Starting free signup on AssemblyAI.
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3
Choose a signup method
On the Create Account page, choose "Sign up with Google" for the fastest signup — or pick any other option you prefer (email signup also works fine).
Step 3 — Choosing a signup method (Google is fastest).
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4
Open the "Manage" menu
After signing up, look at the bottom-left corner of your dashboard and click the "Manage" button.
Step 4 — Opening the Manage menu.
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5
Select "API Keys"
A small dropdown will open. Select the first option, "API Keys".
Step 5 — Selecting the API Keys section.
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6
Click "Create New API Key"
In the center of the screen, you'll see a "Create New API Key" option. Click it.
Step 6 — Creating a new API key.
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7
Name your key and confirm
A popup will appear asking for a name. Type anything you like — for example, "UD Tools Audio to SRT Converter" — then click Create.
Step 7 — Naming your key and confirming creation.
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8
Copy your new API key
Your API key is now generated and shown on screen. Click the Copy button next to it to copy the key to your clipboard.
Step 8 — Copying your API key.
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9
Paste it into UD Tools
Go back to the Audio to SRT Converter on UD Tools and paste your key into the API Key field.
Step 9 — Pasting the key back into UD Tools.
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10
Save it for next time
Right after pasting, click "No Need To Re-Enter Next Time" so the key is saved in your browser and you won't need to repeat these steps again.
Step 10 — Saving your key so you never have to re-enter it.
That's it — your key is saved and ready. You can now convert any audio file to accurate SRT subtitles instantly.
Is My API Key Safe?
Yes. Your API key is stored only inside your own browser's local storage on your own device. It is never sent to or stored on UD Tools' server. When you click "Convert", your key is sent directly from your browser to AssemblyAI's servers for processing — UD Tools never sees it or touches it in between.
What Happens After 100 Free Hours?
AssemblyAI's free tier gives you 100 hours of transcription every month at no cost and with no credit card required. If you use up your free hours in a given month, AssemblyAI's dashboard will let you know, and the free hours reset automatically the following month. For most individual users, students, and content creators, 100 free hours per month is more than enough.
Frequently Asked Questions
Yes. AssemblyAI offers a genuine free tier with 100 transcription hours every month, and creating an account does not require any payment.
No. You can create an AssemblyAI account and generate your free API key without entering any card details.
Your audio is sent directly from your browser to AssemblyAI for processing using your own key. UD Tools does not upload your file to its own server at any point.
Yes, the same key will work on any device or browser. Just paste it into the Audio to SRT Converter on that device and save it there as well.
No problem — log back into your AssemblyAI dashboard, go to Manage > API Keys, and either copy your existing key again or create a new one following the same steps above.
AssemblyAI accepts standard international payment methods (major debit/credit cards) for paid plans, similar to most global AI API providers. For most users, though, the free 100 hours per month is enough and no payment is ever needed.
AssemblyAI's engine is one of the most accurate speech-to-text systems available today, handling clear audio, multiple accents, and background noise well. Accuracy is highest with clear speech and good recording quality.
Yes. The entire process — from getting your free API key to converting audio into SRT subtitles — happens in your browser using the UD Tools Audio to SRT Converter. Nothing needs to be downloaded or installed.
Final Summary
Creating a free AssemblyAI API key takes about two minutes: sign up, open Manage > API Keys, create a new key, copy it, and paste it into the Audio to SRT Converter on UD Tools. Your key stays private in your own browser, you get 100 free hours every month, and you're ready to start converting audio into accurate subtitles right away.
Now that you have your key, start converting
Paste your API key into the tool and turn any audio file into accurate SRT subtitles in seconds.
Open Audio to SRT Converter →Official AssemblyAI signup page: assemblyai.com
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