Microsoft Copilot Speech to Text: Dictate Your Prompts

Microsoft Copilot speech to text comes in two kinds, and they solve different problems. Copilot Voice is a conversation: you talk, and Copilot talks back. Dictation turns your speech into a prompt you can read and fix before you send it. LumeVoice does the second kind in every Copilot box on Windows and Mac, from the Copilot app to Copilot in Word.

Copilot Voice or dictation: which one do you need?#

Copilot Voice is for thinking out loud. You start it from the Voice icon in the composer, Copilot greets you, and you talk. You can interrupt it, change direction and ask follow-ups, and you get a transcript afterwards. Microsoft notes that voice sessions may be time-limited, and that some text features don't work in voice chat yet, such as image creation, file creation and @-mentioning agents.

Dictation is for prompts you want to get right. Your speech becomes text in the prompt box, so you can check a name, fix a number or add "keep it under 200 words" before Copilot runs. It's the better fit for long instructions, prompts that point at a file, and anything you'd rather not say twice.

How to dictate into Copilot with Microsoft's own tools#

As of October 2026, Microsoft's help pages describe three ways to get voice input into a Copilot prompt:

1. Copilot Chat, with a work or school account. In the prompt box, select Start dictation, speak, then select Stop dictation. Say "period," "comma" or "new line" for punctuation, and review the text before sending, as Microsoft advises.
2. Copilot in Teams for personal use. Open the Copilot tab and select Start dictation in the Message Copilot box. Microsoft lists this for Microsoft 365 Personal, Family and Premium subscribers.
3. Windows voice typing. Click into any Copilot box and press Windows key + H. It needs an internet connection, and an auto punctuation setting adds punctuation for you. On Copilot+ PCs, fluid dictation also cleans up grammar, punctuation and filler words in English.

Where they fall short#

• Not every box has a button. Microsoft documents the dictation button for Copilot Chat and for Copilot in Teams for personal use. Where you don't see one, Win+H is the fallback, but only on Windows.
• Mac. Win+H doesn't exist there. Your built-in routes are Copilot's own dictation button, where your account has it, or macOS Dictation.
• Cleanup. Copilot's dictation follows spoken punctuation, and Win+H can punctuate for you. Filler-word removal through fluid dictation needs a Copilot+ PC and English.
• Conversations end. Copilot Voice sessions can disconnect when they hit a time limit.

How to dictate into Copilot with LumeVoice#

LumeVoice types wherever your cursor is, so one key works in the Copilot app, Copilot on the web, and Copilot in Word, Excel, PowerPoint, Outlook and Teams.

1. Download LumeVoice for Windows or Mac and sign in. On Windows it installs per user, so you don't need admin rights.
2. Click into the Copilot prompt box.
3. Hold Ctrl + Win on Windows or fn on a Mac, say your prompt, and let go.
4. The cleaned-up prompt appears in the box. Edit anything you like, then send it.
5. For a long brief, double-press the key for hands-free mode, and press it once when you're done.

On your phone, open the Copilot app and switch to the Lume keyboard on iPhone, or tap the Lume bubble on Android.

Tips for dictating prompts Copilot gets right#

Microsoft's advice for prompts in Copilot in Word is to describe the outcome you want and name the readers, purpose, sources, format, tone and length. That's a lot to type, and easy to say in one breath. An illustrative example:

You say: "Using the Q3 planning notes, draft a one-page update for the sales team, um, friendly but direct, in three short sections, no, make it two, and end with the two decisions we need from them."

Lume types: "Using the Q3 planning notes, draft a one-page update for the sales team: friendly but direct, in two short sections, ending with the two decisions we need from them."

A few more habits that help:

• One outcome per prompt. Ask for the draft, then refine it with follow-ups such as "shorten this by half," the way Microsoft suggests, instead of packing everything into one request.
• Write your own draft first. Dictate the rough version straight into Word or Outlook, then ask Copilot to tighten it. Your ideas, Copilot's polish.
• Get names right. Add colleagues, clients, products and acronyms to Lume's custom dictionary, so prompts that mention them come out spelled correctly.
• Correct yourself out loud. Say "Tuesday, actually Wednesday" and Lume keeps only Wednesday.
• Use the same key in the thread. In Microsoft Teams, the key that dictates your Copilot prompt also dictates your reply to the channel.

Copilot's voice options vs LumeVoice#

When Copilot's built-in voice is the better choice#

• You want a conversation. Brainstorming, quick questions, talking something through while you pace: Copilot Voice does that, and LumeVoice doesn't.
• You're on Windows and dictate now and then. Win+H is free, and on a Copilot+ PC fluid dictation already tidies filler words in English.
• You have a work account and only dictate into Copilot Chat. The Start dictation button is right there.
• Your IT team needs central management. LumeVoice has no team plan or admin console.

LumeVoice makes sense when you dictate a lot, in Copilot and everything around it, when you work on a Mac, or when you want self-corrections, spoken lists, a custom dictionary and 100 languages on your computer and your phone.

Talk to Copilot, or dictate to it#

Use Copilot Voice when you want to think out loud with Copilot, and dictation when the prompt itself matters. Microsoft's built-in options cover a lot of that for free. LumeVoice adds one key that works in every Copilot box and every other app you write in, with the ums and false starts already gone.