How do I slow down a text-to-speech voice?

Move the speed control below 1x before you generate the audio. Something like 0.8x or 0.9x reads a little slower without sounding sluggish, which is enough to catch typos or follow a hard passage. Preview it, adjust, then download. Because the speed is set at generation time, the slower pace is baked into the MP3 you save.

What speed is best for studying or proofreading?

For proofreading, drop to about 0.8x to 0.9x. Your ears catch clumsy sentences and missing words that your eyes skim past, and the slower pace gives you time to react. For reviewing study notes you already know, 1.1x to 1.3x keeps it moving without losing you. There is no single right number, so test a line or two and trust what you can actually follow.

Can I speed it up to 2x?

You can push the speed up well past normal to scan a long piece by ear. Just know that comprehension drops off the faster you go, so 1.5x is a comfortable ceiling for most people and the very top end is better for skimming than for real listening. Set it, preview a sentence, and back it down if you are missing words.

Does changing the speed change the pitch or make it sound like a chipmunk?

No. JustListen adjusts the speaking rate on the neural voice itself, so the voice keeps its normal pitch at slower and faster settings. It is not the old trick of speeding up a recording, which raises the pitch and makes it sound cartoonish. The voice sounds like the same person talking faster or slower.

Can I change the speed after I download the MP3?

Not without re-doing it. The speed is set when the audio is generated, so it is fixed inside the file you download. If you saved it too fast or too slow, just paste the text again, pick the speed you want, and download a fresh MP3. It takes a few seconds and there is no watermark or account in the way.

How to Change Text-to-Speech Speed (Before You Download)

You want the voice to read at a pace that actually works for you, slower to catch mistakes, faster to get through a long article. The short version: set the speed before you generate the audio, because on a text-to-speech tool the speed is baked into the file at generation time, not adjusted afterward. Here is how to do it, and what speed to pick for the job you are actually doing.

How to change the speed before you download

The speed control is a slider or a set of steps, usually running from around 0.5x up past 2x, with 1x being the normal talking pace. The flow is quick:

Paste your text into the box.
Pick your voice and accent.
Set the speed slower or faster than 1x.
Press play to preview a sentence at that pace.
Adjust until it sounds right, then download the MP3.

The reason step three comes before the download matters: the audio is generated at the speed you set, so that pace is locked into the MP3. If you export it too fast, you cannot slow the file down later without it sounding off. Set it first, preview it, then save.

What speed should you actually use

There is no universal best speed. It depends on what you are doing, so here is a plain guide.

Proofreading your own writing: drop to about 0.8x to 0.9x. Reading aloud is one of the best editing tricks there is, because your ears notice the awkward sentence and the missing word that your eyes glide over. A slightly slower pace gives you the beat you need to react before the next line starts.

Studying and reviewing notes: 1x for material you are learning, 1.1x to 1.3x for notes you already half-know and just want to run past your ears again on a walk or a commute.

Accessibility and following difficult text: slower is friendlier, around 0.8x to 1x. It lowers the effort of keeping up so you can focus on the meaning instead of racing the voice.

Scanning a long article by ear: this is where faster earns its keep. 1.3x to 1.5x gets you through a wall of text quickly. You can go higher, but comprehension falls as you climb, so treat the very top of the range as skimming, not real listening.

The honest rule underneath all of that: preview a line or two at your chosen speed before you commit. What sounds fine on paper is different from what you can follow by ear.

Does changing the speed change the pitch

No, and this is worth knowing because it is where a lot of tools trip up. JustListen adjusts the speaking rate on the neural voice itself, so the voice keeps its normal pitch whether you slow it down or speed it up. It is not the old cassette-tape trick of playing a recording faster, which shifts everything higher and turns the voice into a chipmunk. Here the voice sounds like the same person choosing to talk faster or slower. That means you can push the speed a fair way in either direction and still get something natural to listen to.

Why set the speed before you download instead of after

You could speed up or slow down an MP3 afterward in an audio editor, but there are two reasons not to. First, editing playback speed after the fact is exactly the method that shifts the pitch and makes the voice sound wrong, unless you use a proper time-stretch tool, and that is more hassle than it is worth. Second, you do not need to. Setting the speed at generation gives you a clean file at the right pace with none of that. So the honest workflow is the simple one: pick the speed, preview it, download the MP3, done.

If you realize after the fact that you saved it at the wrong speed, do not fight the file. Paste the text again, set the speed you actually want, and download a fresh one. It takes a few seconds, and there is no account or watermark standing in the way.

Quick reference

Proofreading or editing: 0.8x to 0.9x
Learning new material: 1x
Reviewing familiar notes: 1.1x to 1.3x
Accessibility or hard text: 0.8x to 1x
Scanning a long piece by ear: 1.3x to 1.5x

Start at 1x, move one notch at a time, and preview before you export. That is the whole skill.

That is the idea behind JustListen: paste your text, set the speed that fits what you are doing, and download a clean MP3 at that exact pace, free, with no watermark and no account.