Repair manual
Why Mac dictation gets your words wrong
Inaccurate dictation is almost never one problem. It is four, they stack on top of each other, and three of them are yours to fix in about ten minutes. The fourth is the one worth understanding properly, because it is the only one that does not get better with practice, better hardware, or a quieter room. If dictation is not producing text at all rather than producing wrong text, start with the fix list for dictation not working instead.
- Updated
- August 2, 2026
- Applies to
- Recent macOS, any dictation tool
- Contents
- 4 causes, easiest first
No percentages appear on this page. We have not run a formal accuracy benchmark, and neither, as far as we can tell, did the pages quoting figures for this query. The ranking above is the order these causes are worth checking in, not a measurement of anything.
Cause 01
The Mac is listening to the wrong thing, from too far away
Start here because it is free and it is frequently the whole problem. The Dictation section of System Settings has a microphone source, and its default is Automatic. Automatic picks well right up until you connect a monitor with a built-in microphone, an audio interface, or a headset, at which point your Mac can quietly start listening to a microphone on the other side of the desk.
Then fix the distance. Speech recognition works from what reaches the microphone, and what reaches it falls away quickly with distance while the room's noise does not. A microphone roughly a forearm away and pointed at your mouth is a different input signal from the same microphone at arm's length across a desk. This is usually a bigger improvement than buying anything.
Last, the room. A desk of glass, a bare wall behind you, and a hard floor send your voice back at the microphone a few milliseconds late, smeared over the words that follow. A rug, a curtain, a bookshelf, or simply turning to face a softer wall all reduce that. You are not soundproofing a studio, you are removing one reflection.
System Settings Keyboard Dictation
Microphone source
Automatic
The one you talk into
USB Display Audio
Then open System Settings, then Sound, and watch the input meter move while you speak. A flat meter is a hardware problem, not an accuracy problem.
Cause 02
Something else in the room is also talking
Steady noise and intermittent noise cause different failures. A fan, an air conditioner, or a nearby laptop working hard sits under everything and eats the quiet consonants: the ends of words go first, plurals disappear, and short function words get swallowed. Intermittent noise is worse in a different way. A colleague's sentence, a podcast, or a passing siren does not just obscure your words, it gives the system a second plausible thing to transcribe.
The practical order: close the window, move away from the fan, and stop the music before you consider hardware. A headset microphone helps here more than in a quiet room, because it moves the microphone close enough that your voice is much louder than the room. Mechanical keyboards are their own category. If you type while you dictate, the keystrokes land in the recording.
One hedge worth stating: recent macOS versions offer microphone modes, including Voice Isolation, from Control Center while an app is using the microphone, and support varies by app. We have not verified how built-in Dictation behaves with it, so treat it as worth trying rather than as a documented fix.
Noise, by type
Fan, air conditioning eats endings
Speech nearby adds words
Typing clips syllables
A close microphone does not remove noise. It makes you louder than the noise, which has the same effect.
Cause 03
How you speak, and how you were trained to be heard
Two separate things get bundled together here, and they deserve separating. The first is delivery, which is yours to change. Speech recognition uses the words around a word to decide what that word was, so a full phrase is easier to transcribe than the same words delivered in fragments. Dictating the way you talk, at the pace you talk, with the sentence finished before you stop, produces better text than slowing down and over-enunciating, which strips out the connections the system is relying on.
The second is accent, and it is not a delivery problem. Recognition systems are trained on recorded speech, and accents that appear less often in that material tend to be recognised less reliably. That is a property of how these systems are built, not a fault in how anyone talks, and it is why we are not going to tell you to sound different. The change that is actually available is the language list: as of August 2026 macOS lists more than one English variant, and choosing the one closest to your speech is a real, free adjustment.
Spontaneous speech is also harder than read speech, for everyone. Thinking out loud produces restarts, repairs, and half-abandoned clauses, and those are genuinely ambiguous rather than mistranscribed. Composing the sentence in your head before you press the key is the single largest delivery improvement most people find.
System Settings Keyboard Dictation Languages
Click Edit next to Languages and pick the English variant closest to how you speak.
Worth knowing
Apple Dictation stops after about 30 seconds without speech, with no setting to change it. Pausing to think mid-sentence can end the session rather than produce a bad transcript.
Cause 04
It has never been told the word, and there is nowhere to tell it
Work through the first three and a residue remains, and the residue is always the same shape: names of people, names of products, internal jargon, acronyms, the two-word phrase your team says forty times a day. These are not misheard because the audio was poor. They are misheard because the system is choosing the most probable word it knows, and your colleague's name is not on that list.
This is the cause that separates dictation tools, because everything before it is about your room and this one is about the software. And it is the one where built-in Mac dictation has no mechanism at all: no dictionary, no correction that sticks, no place to say "when I say this, write that". The word comes out wrong, you fix it by hand, and tomorrow it comes out wrong in exactly the same way.
The confusion worth clearing up: macOS does have a custom vocabulary feature, and it belongs to Voice Control, which is a different system feature for operating the whole Mac by voice. Keyboard Dictation is unavailable while Voice Control is on, so it is not a setting you can borrow.
What gets mangled
People's names
Product and company names
Acronyms said as letters
Team jargon
The list is short, it repeats, and it is the same list every day. Which is exactly why it is worth teaching once.
The part that never fixes itself
Apple Dictation has no custom dictionary
Not a hidden one, not a hard one to find. There is no place in Dictation to add a word, and no correction you can make that the feature remembers. Custom vocabulary on a Mac exists, but it is a Voice Control feature, and Voice Control and keyboard Dictation cannot run at the same time.
So a name it mishears once, it mishears the same way forever. Every other cause on this page rewards effort. This one does not, and it is the one that shows up in every message you send.
System Settings Accessibility Voice Control Vocabulary
That path is the Voice Control feature, kept here so you can confirm it for yourself. It will not change what keyboard Dictation types. The full distinction is on Voice Control vs Dictation.
The alternative
Teach it the word once
Dictate is our app. It keeps a glossary: the spelling you want, plus the ways that term actually gets heard. You add a term with the correct spelling and the sounds it arrives as, and the transcript uses your spelling from then on. Every entry is listed, switchable, and removable, so it stays a list you own rather than a model quietly deciding things about you.
You say
No dictionary
With your glossary
“post gres”
post grass
Postgres
“s d k”
S. D. K.
SDK
“Siobhan”
Shivon
Siobhán
Where it lives
Two fields, then it is done
The Glossary tab in Dictate's settings has one section for adding a term (the correct spelling, and how it might sound) and one listing the terms you have added. There is no training step and nothing to download.
Dictate Settings Glossary Add a term
The honest limits
What a glossary does not do
It will not rescue audio the microphone never captured, and it will not make a noisy room quiet. Causes 01 and 02 still belong to you. Dictate also transcribes English only, and transcription runs on our servers over TLS, so it needs a network connection. The audio is discarded after it is transcribed, and the history keeps the text, not the recording.
On percentages
We are not going to quote a number
As of August 2026, several pages ranking for this query carry accuracy percentages. We have not run a formal benchmark, so we do not have one, and publishing a figure we did not measure would be the easiest thing on this page to do and the least honest. A word error rate also depends on the microphone, the room, the speaker, and the subject matter, which means a single number describes one recording rather than a tool.
The question that survives all of that is simpler: after you speak a paragraph, how much editing are you left with? Dictate a real message, in the app you actually use, and count the corrections. Then do it again with the ten words your job is built out of. The second test is where the four causes stop being equal.
Causes 01 to 03 improve for every tool at once, ours included.
Cause 04 improves only where the tool has somewhere to put the word.
Try it
The words your job is built out of
Dictate holds to record by default, inserts at the cursor in native apps, browsers, Electron apps, and terminals, and costs a flat $8 a month, monthly only. Unused subscriptions are refunded in full; once you have transcribed something, that month is not refundable. We would rather say that here than in a footnote.
If what you actually want is to say “delete that” and “new paragraph” rather than teach it your vocabulary, the Mac dictation command list is the better page, and Apple's built-in feature is the better tool.
FAQ
Causes, limits, and the number we are not printing.
Why is Mac dictation so inaccurate for me?
Usually one of four things: the Mac is listening to the wrong microphone, the room is noisy or reflective, you are speaking in fragments rather than phrases, or you are saying words the system has never been given. The first three respond to changes you can make in a few minutes. The fourth does not.
Can I add custom words to Mac dictation?
Not to Dictation itself. Apple Dictation has no custom dictionary. Custom vocabulary on a Mac is a Voice Control feature, which is a separate system feature for operating the Mac by voice, and keyboard Dictation is unavailable while Voice Control is switched on.
Does Mac dictation get more accurate the more I use it?
Not in the way people expect. There is no place to correct a word and have the correction stick. If a name comes out wrong today, it comes out wrong the same way next month, because nothing in the feature records what you meant.
Does a better microphone actually help?
Often more than anything else on this page, though the bigger win is usually distance rather than price. Speaking about a forearm away from a microphone that is pointed at you beats speaking across a desk into a laptop, whatever the hardware cost.
Is dictation less accurate if you have an accent?
It can be. Speech recognition is trained on recorded speech, and accents represented less often in that material tend to be recognised less reliably. It is a real limitation rather than a fault in how you talk. Picking the closest English variant in the language list and speaking in whole phrases both help.
How accurate is Dictate?
We have not run a formal benchmark, so we are not going to quote a percentage. The useful question is how much editing a tool leaves you with, and the part we can state plainly is that Dictate has a glossary: names, product names, and jargon can be taught once and spelled correctly after that.
Does the glossary work for languages other than English?
No. Dictate transcribes English only. If you dictate in another language, Dictate is the wrong tool and we would rather say so here than after you have paid.