2 Ways to Convert PDF to MP3 | Free Audio via Mojiokoshi-san x Ondoku

Is there a way to turn a PDF I have on hand into MP3 audio and listen to it on my smartphone?

It would be convenient to listen to PDFs while commuting or in between household chores, wouldn't it?

Actually, there is a way to convert PDFs to MP3 audio for free!

There are two methods for conversion.

• Method of converting the PDF to text and then pasting it into Ondoku
• Method of converting the PDF to an image and then using Ondoku's image reading function

In this article, we will explain two methods for PDF to MP3 conversion that can be used on both Windows and Mac, each with accompanying images.

Since it also supports scanned PDFs where text cannot be selected, it can be used for PDFs of scanned paper documents or for turning meeting minutes into audio.

What you will learn in this article:

1. Two methods to convert PDF to MP3 and how to choose the right one for your needs
2. Steps to convert PDF to text with 文字起こしさん and read it aloud with Ondoku (Recommended)
3. Steps to convert PDF to images with PDF画像変換さん and read it aloud with Ondoku

What are the recommended methods for converting PDF to MP3?

Ondoku is a free AI site that can generate audio from text or images.

Since you cannot read PDF files directly, you first need to convert the PDF into either "text" or an "image."

The following two methods are convenient for conversion:

• 『文字起こしさん』: An AI site that can convert PDF to text
• 『PDF画像変換さん』: A web service that can convert PDF to images

Method 1: Convert to text with 文字起こしさん and then read aloud (Recommended)

This is a method where you convert a PDF to text using 『文字起こしさん』, then paste that text into Ondoku to read it aloud.

Since it is output as text, the appeal is that you can check the content or correct it yourself before turning it into audio.

This is recommended for those who want to prepare the content themselves before turning it into audio.

Method 2: Convert to images with PDF画像変換さん and then read aloud

This is a method where you convert a PDF into images (JPG/PNG) using 『PDF画像変換さん』 and then read them using Ondoku's image reading function.

Since there is no limit on the number of pages, it is convenient when you want to convert long PDFs into images and audio all at once.

While you cannot edit the text beforehand, the operation from conversion to reading is simple.

Which one to choose? We recommend choosing based on your needs

When in doubt, Method 1 (文字起こしさん) is recommended.

By converting to text beforehand, you can check and correct the content before reading, and easily turn only the necessary parts into audio for free.

【Method 1/Recommended】Text conversion with 文字起こしさん → Read aloud with Ondoku

Now, let's look at the methods to convert PDF to MP3 in order.

First, we will explain the method of converting a PDF to text with 文字起こしさん, pasting it into Ondoku, and turning it into an MP3.

What is 文字起こしさん? | A free-to-use AI transcription site

『文字起こしさん』 is a free web application that can transcribe audio, video, images, and PDFs into text using AI.

By simply uploading a PDF file, the AI reads the content and converts it into text.

A key feature is that it requires no installation and can be used immediately in a browser.

Furthermore, by registering as a free member, you can transcribe up to 10 pages of PDF per day.

1. Upload PDF to 文字起こしさん and convert to text

Open the top page of 『文字起こしさん』.

Click the "Select File" button and choose the PDF file you want to transcribe.

You can also upload by dragging and dropping.

After choosing the file, check the "Language."

Select "Japanese" for a Japanese PDF file or "English" for an English PDF file.

When ready, click the "Upload" button, and the transcription will start automatically.

Once processing is finished, the transcribed content will be displayed on the screen.

2. Check the text and edit as necessary

Check the transcribed text and make corrections as needed, such as deleting unnecessary parts (headers, page numbers, etc.), to prepare the content you want to read aloud.

In addition to downloading the transcribed text as a text file, you can also use the latest AI to summarize or analyze it from the screen opened by clicking the "View Details" button.

3. Convert text to MP3 file for free with Ondoku

Once the text is ready, open the top page of 『Ondoku』.

Paste the text extracted from 文字起こしさん into the text input field.

Select the language, such as Japanese or English, according to the content of the PDF.

Choose the reading voice (speaker).

Ondoku has many voices available, including female, male, and children, so you can choose your favorite voice according to the content (click here for Japanese voice samples).

Now preparation is complete.

Press the "Read aloud" button to start generating the audio.

Once the audio generation is finished, the screen will switch and the audio will play automatically.

Check the content, and if there are no problems, click the "Download" button to save the MP3 file.

This completes the procedure for reading a PDF transcribed with 『文字起こしさん』 using 『Ondoku』 and converting it to MP3.

『Ondoku』 allows you to read up to 5,000 characters for free when you register an account.

The generated audio can also be used for commercial purposes (please provide credit notation when using for commercial purposes for free).

You can quickly get the hang of the flow by trying it with a PDF you have on hand, so why not experience 『文字起こしさん』 and 『Ondoku』 for yourself?

【Method 2】Image conversion with PDF画像変換さん → Read aloud with Ondoku

Next, we will explain Method 2.

This is the flow of converting a PDF to an image with PDF画像変換さん and then turning it into an MP3 using Ondoku's image reading function.

It is suitable for long PDFs with many pages or those that exceed the limits of 文字起こしさん.

What is PDF画像変換さん?

『PDF画像変換さん』 is a free web application that can convert PDF files into images such as JPG and PNG.

You can start converting immediately as it can be used in a browser without member registration.

The converted images are exported one by one for each page of the PDF and can be downloaded together in a ZIP format.

1. Convert PDF to images with PDF画像変換さん

First, open 『PDF画像変換さん』 in your browser.

Once the page is open, choose the conversion format from JPEG or PNG.

Click the "Select PDF file" button or drag and drop the file to choose the PDF you want to turn into audio.

Once the file is selected, the image conversion process will start automatically.

When the conversion is finished, the image files will be downloaded together in a ZIP format.

Be sure to extract the ZIP file before uploading to Ondoku.

2. Read images with Ondoku and download MP3

Open the top page of 『Ondoku』 and click the "Image" tab above the text input field.

The screen will switch to the image upload screen, so select the image file converted from the PDF using the "Select Image" button.

When an image is selected, the text within the image is automatically read and displayed in the text box.

If there are any errors in the recognition results, you can also correct them directly in the text box.

After selecting the voice type and speed, click the "Read aloud" button.

Once the audio generation is finished, you can play and check the content on the screen.

Click the "Download" button to save it as an MP3 file.

This completes the procedure for reading a PDF converted to an image with PDF画像変換さん using Ondoku and converting it to MP3.

It can be used for free, so why not try turning your PDF files into images and reading them with Ondoku?

Frequently Asked Questions when converting PDF to MP3

For PDFs where text can be copied, you can paste directly into Ondoku

If you can select and copy the body of the PDF with your mouse, it is possible to paste the text directly into Ondoku without using 文字起こしさん or PDF画像変換さん.

By opening the PDF in a browser or Acrobat Reader, copying the body, and pasting it into Ondoku's "Text" tab, you can convert it to MP3 directly.

However, since headers or paragraph layouts of the copied text may break, you should check the content once after pasting.

For PDFs where text cannot be selected or documents with many diagrams, using Method 1 (文字起こしさん) or Method 2 (PDF画像変換さん) introduced in this article is more reliable.

What if the text in the image is not recognized correctly?

When using Method 2 to turn a PDF into an image and read it aloud, the accuracy of character recognition depends on the resolution of the image and the clarity of the text.

Since blurred images increase misrecognition, the trick is to specify as high a resolution as possible when converting a PDF to an image.

Handwritten characters, extremely stylized typefaces, or thin, faded printing may not be read correctly.

In such cases, correct the recognition results in the text box before turning it into audio.

For more detailed usage of Ondoku's image reading function, please refer to this article.

How to use image reading | How to use free OCR for photo text and turn it into audio | Text-to-speech software Ondoku

Explaining the functions of "Ondoku," which can read text from images or photos (OCR) and read it aloud. It can be used for free. Whether on a PC or smartphone, simply upload an image and reading will be completed in just a few seconds.

What is the vertical transcription function of 文字起こしさん?

When performing OCR on vertical text from books, magazines, or newspapers, you may find that headers or columns are not recognized correctly.

In such cases, 『文字起こしさん』 is recommended!

Equipped with an AI dedicated to vertical writing, it can automatically determine columns, headers, and captions to convert them into text with high accuracy in the correct order.

For more details on how to transcribe vertical books, magazines, and documents, please refer to this article.

Please take a look.

How to transcribe vertical PDFs. Convert books, magazines, and old documents into text for free | AI transcription service - 文字起こしさん

Explaining how to transcribe vertical PDFs with high accuracy. PDFs of books, magazines, newspapers, and old documents can be converted to text for free. By including image conversion, the AI automatically identifies columns and complex layouts. OK from smartphones as well.

Summary of methods to convert PDF to MP3

There are two ways to convert PDF to MP3: the method of converting to text with 文字起こしさん and the method of converting to images with PDF画像変換さん.

After that, you can download it as an MP3 by reading the text or images with Ondoku.

If you want to edit the content before turning it into audio, converting it to text with 『文字起こしさん』 is recommended, and if you want to convert a long PDF with many pages all at once, converting it to images with 『PDF画像変換さん』 is recommended.

Why not try converting the PDF files you have on hand into MP3 by following the steps introduced in this article?

■ AI voice synthesis software "Ondoku"

"Ondoku" is an online text-to-speech tool that can be used with no initial costs.

• Supports approximately 50 languages, including Japanese, English, Chinese, Korean, Spanish, French, and German
• Available from both PC and smartphone
• Suitable for business, education, entertainment, etc.
• No installation required, can be used immediately from your browser
• Supports reading from images

To use it, simply enter text or upload a file on the site. A natural-sounding audio file will be generated within seconds. You can use voice synthesis up to 5,000 characters for free, so please give it a try.

Text-to-speech software "Ondoku" can read out 5000 characters every month with AI voice for free. You can easily download MP3s and commercial use is also possible. If you sign up for free, you can convert up to 5,000 characters per month for free from text to speech. Try Ondoku now.

HP: ondoku3.com
Email: ondoku3.com@gmail.com