How to convert JPG to BMP on Mac

How to Convert JPG to BMP on Mac: Complete Guide

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Need to convert a JPG image into BMP on your Mac? Whether you’re preparing graphics for legacy software, game development, embedded systems, printing, or Windows applications, macOS makes the process easier than many people realize.

Also see: Convert JPG to BMP Converter Online

This guide explains several ways to convert JPG to BMP on Mac, including built-in macOS tools, Terminal commands, batch conversion methods, and online converters. By the end, you’ll know the fastest and safest method for your needs.

Quick Answer

The fastest way to convert JPG to BMP on Mac is:

  1. Open the JPG image using Preview.
  2. Click File > Export.
  3. Hold the Option key while opening the Format dropdown.
  4. Select Microsoft BMP.
  5. Click Save.

This method requires no additional software and works entirely offline

What is a BMP File?

BMP (Bitmap Image File) is one of Microsoft’s oldest image formats.

Unlike JPG, BMP files typically store images with little or no compression, preserving every pixel exactly.

Because BMP images are usually uncompressed, they:

  • Maintain maximum image quality
  • Open on nearly every Windows computer
  • Are commonly used in engineering applications
  • Work with older software
  • Support raw bitmap graphics

If you’re uploading images online, JPG is usually better.

If software specifically requests BMP, conversion is necessary.

Method 1: Convert JPG to BMP Using Preview (Best Method)

Preview is included with every Mac and supports exporting images into multiple formats.

Step 1

Locate your JPG image.

Double-click it.

If another application opens it, right-click the image and choose:

Open With > Preview

Step 2

Click:

File → Export

Do not choose Export as PDF.

Step 3

This is the step many users miss.

Hold the Option (⌥) key.

While holding it, click the Format dropdown.

Additional file formats appear, including:

  • Microsoft BMP
  • TIFF
  • OpenEXR
  • JPEG 2000

Choose:

Microsoft BMP

Apple hides some legacy formats unless the Option key is pressed.

Step 4

Choose:

  • File name
  • Save location

Click:

Save

Your BMP image is now ready.

Method 2: Convert JPG to BMP Using Terminal

Advanced users may prefer Terminal.

macOS includes the sips (Scriptable Image Processing System) command.

Example:

sips -s format bmp image.jpg --out image.bmp

Replace:

  • image.jpg
  • image.bmp

with your filenames.

This method is ideal for developers, automation, and scripting.

Method 3: Batch Convert Multiple JPG Images

Need to convert dozens or hundreds of images?

Preview supports batch conversion.

Steps

  1. Select all JPG files.
  2. Open them in Preview.
  3. Select all thumbnails in the sidebar.
  4. Choose:

File → Export Selected Images

  1. Select:

Microsoft BMP

  1. Save.

Apple also recommends selecting multiple files in Preview before exporting when converting several images at once.

Method 4: Use an Online JPG to BMP Converter

If you don’t have access to your Mac or prefer browser-based tools, online converters are another option.

Typical steps include:

  1. Upload JPG.
  2. Select BMP.
  3. Convert.
  4. Download.

Online converters are useful when:

  • Using a shared computer
  • Working on multiple operating systems
  • Converting files without installing software

Avoid uploading confidential or sensitive images to online services.

Frequently Asked Questions

How do I convert JPG to BMP on Mac for free?

Use the built-in Preview app. Open the JPG image, select File > Export, hold the Option key to reveal additional formats, choose Microsoft BMP, and save the file. No extra software is required.

Can Preview convert JPG to BMP?

Yes. Preview supports BMP export, although the format may only appear after holding the Option key while opening the Format menu.

Why is my BMP file much larger than my JPG?

BMP files are typically uncompressed, while JPG files use lossy compression to reduce file size. As a result, BMP images can be many times larger.

Can I batch convert JPG to BMP on Mac?

Yes. Preview supports converting multiple images at once by selecting several files and exporting them together.

Does converting JPG to BMP increase image quality?

No. The conversion changes the file format but cannot recover image data already lost during JPEG compression.

Is there a command-line method to convert JPG to BMP?

Yes. macOS includes the sips utility, which can convert images directly from Terminal using a single command.

Final Thoughts

Converting JPG to BMP on Mac is quick and doesn’t require expensive software. For most users, Preview offers the simplest and safest solution, while Terminal and batch conversion options provide flexibility for advanced workflows. Although BMP files are much larger than JPGs, they remain essential for certain professional, industrial, and legacy applications.

If you only need occasional conversions, Preview is the best choice. For large-scale projects, batch processing or automation with the built-in sips command can save significant time. By understanding when and why to use BMP, you can choose the right image format for every task while maintaining compatibility with the software and devices you use most.