“How do I safely compress an ISO file without corrupting the data stored in it? How to compress an ISO file? Does anybody know of any software which will allow me to compress an ISO. file?”

An ISO disc image is typically an uncompressed sector-by-sector copy of the data on an optical disc stored inside a binary file. The data inside the ISO image is structured based on the file system that was used on the optical disc from which it was created. You can use any lossless compression algorithm to compress the file (e.g., add the ISO to a ZIP file, etc.). How much compression you actually achieve will depend on the binary data in the file and on the algorithm you use. If you have been searching hard for solutions to compress ISO files to fit on DVD or only for smaller size, this guide would be helpful. We will show you how to compress ISO to fit on DVD or smaller size in different ways.

Part 1. Compress ISO file Free with PowerISO

PowerISO is a powerful CD/DVD/BD image file processing tool, which allows you to open, extract, burn, create, edit, compress, encrypt, split and convert ISO files, and mount ISO files with internal virtual drive. It can process almost all CD/DVD/BD image files including ISO and BIN files. PowerISO provides an all-in-one solution. You can do every thing with your ISO files and disc image files. You could use PowerISO to compress ISO image files to fit on DVD or USB drives easily.

You could check the below guide to learn how to compress ISO files to fit on DVD disc or USB drive or other devices with PowerISO in detail:

You then only need to wait for the compression to complete. PowerISO will complete the compression quickly with high quality.

Part 2. Compress ISO file Free with DVDShrink

DVD Shrink is a freeware DVD transcoder program for Microsoft Windows that uses a DVD ripper to back up DVD video. DVD Shrink's purpose is, as its name implies, to reduce the amount of data stored on a DVD with minimal loss of quality, although some loss of quality is inevitable (due to the lossy MPEG-2 compression algorithm). It creates a copy of a DVD, during which the coding only allowing the DVD to be played in certain geographical areas is removed, and copy protection may also be circumvented. A stamped DVD may require more space than is available on a writeable DVD, unless shrunk. Many commercially released video DVDs are dual layer (8.5 GB); DVD Shrink can make a shrunk copy which will fit on a single-layer (4.7 GB) writeable DVD, processing the video with some loss of quality and allowing the user to discard unwanted content such as foreign-language soundtracks.

You could follow the below steps to learn how to compress ISO file with DVD Shrink to smaller size.

DVD Shrink is a free DVD converter and compressor software tool, but now it’s been discontinued.

Part 3: Best ISO Compressor for Windows/Mac - Leawo DVD Ripper

You could also compress ISO files to digital videos to remove unwanted video titles in source ISO files. To do this, Leawo DVD Ripper is the best ISO compressor for Windows/Mac computers.

Leawo DVD Ripper could decrypt, rip and convert DVD movies from disc, folder and ISO image files to video/audio files in various formats like DVD to MP4, DVD to AVI, DVD to MKV, DVD to MP3, DVD to AAC, etc. for multiple media players and portable devices. Featured with advanced disc decrypting technology, Leawo DVD Ripper could decrypt both commercial and non-commercial DVD discs, and remove DVD disc region restrictions. You could even edit DVD movies and create 3D movies out of 2D DVD movies with it.

As for ISO file compression, Leawo DVD Ripper enables you to decrypt, rip and convert ISO image files to videos in various formats like ISO to MP4, ISO to AVI, ISO to MOV, ISO to WMV, etc. By converting, unwanted video titles in source ISO file could be removed. And you could even adjust output video and audio parameters like “Video size”, “Video code”, “Bite rate” and other output parameters to reduce the file size of output digital video files.

It’s easy to use. Follow the below instructions to learn how to convert ISO files for compressing with Leawo DVD Ripper. But before that, you need to download and install Leawo DVD Ripper on your computer. Meanwhile, get source DVD ISO file ready for converting.

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• Leawo DVD Ripper

  ☉ Convert DVD to video/audio files like MKV, MP4, AVI, FLV, RMVB, etc

  ☉ Convert DVD to iPad, iPhone, Android devices

  ☉ Edit DVD video files with built-in video editor

  ☉ Add 3D effect with built-in 3D movie creator

  ☉ Selectable subtitles and audio tracks from source DVD movies for output videos

  DownloadDownload

Note: Leawo DVD Ripper is built in to Leawo Prof. Media as a module.

Step 1. Enter Leawo DVD Ripper

Launch Leawo Prof. Media after installation and then enter the “Convert” module.

Step 2. Add source ISO file

Drag-and-drop your ISO files for input or simple click “Add Blu-ray/ DVD” icon to choose “Add iso file” option to import DVD ISO file into Leawo DVD Ripper. Some user-friendly settings could be done here, including selecting DVD chapters or titles, selecting subtitle and audio, previewing DVD videos with built-in player, screenshot during previewing, etc.

Note: Leawo DVD Ripper offers 3 different content loading modes: Full Movie, Main Movie and Custom Mode. Full Movie allows you to import all titles, and Main Movie only imports the longest title by default while you can freely choose titles for importing under Custom Mode. Choose a mode and click “OK” button to start importing source DVD files. Since you need to compress ISO file to fit DVD or other devices, you could choose either Main Movie mode or Custom Mode here and then select the desired DVD titles for output.

Step 3. Choose output format

Click the drop-down box (named “MP4 Video” by default) next to the “Add Photo” box, and choose “Change” to select output format from the “Format > Common Video” group.

Step 4. Adjust detailed settings

If mouse stays on the format option, there will appear an “Edit” icon for you. Click it to adjust video and audio parameters of output format, including: video codec, quality, bit rate, frame rate, aspect ratio, channel, audio codec, resolution, etc. To reduce the file size of ISO file, you could lower down the values of Resolution, Bit Rate, Video Quality, etc.

Step 5. Set output directory and start compressing

Click the big green “Convert” button on the top-right of the interface. On the popup sidebar, set output directory in the “Save to” box. After that, click the bottom “Convert” button to start converting ISO files to digital videos. When the conversion completes, you will get a digital video file at much smaller file size.

Part 4: Best ISO Compressor for Windows/Mac - Leawo DVD Copy

Leawo Software also provides you a solution to help you directly copy and compress ISO files to fit on DVD. That’s Leawo DVD Copy. It is a professional DVD copy software program that enables you to decrypt, copy and back up DVD content between disc, folder and ISO image files in 1:1, movie-only or custom mode, regardless of disc protection and region restriction. You could easily copy DVD to blank disc or computer hard drive, and copy ISO file to DVD disc directly with content compressed.

Follow the below steps to learn how to compress ISO file to DVD disc directly with Leawo DVD Copy. Download and install it on your computer first. Get source ISO image file ready and blank writable DVD disc inserted into the DVD drive.

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• Leawo DVD Copy

  1:1 Blu-ray & DVD Backup
  Copy Blu-ray/DVD in 3 different copy modes
  Burn ISO image to Blu-ray/DVD disc with ease
  Retain subtitles and audio tracks at will
  Remove disc protection such as AACS, BD+, MKB, CSS and region restriction
  Support Backup of BD50, BD25, DVD-9 and DVD-5
  Compress BD 50 to BD 25 rapidly
  Easy to use interface for both novices and veteran

  WindowsMac

Note: Leawo DVD Copy is also a module built in Leawo Prof. Media.

Step 1: Open DVD Copy

Run Prof. Media, click “Copy” tab to enter DVD Copy module. Meanwhile, insert the blank writable DVD disc into the DVD drive.

Step 2: Add source ISO image file

Click "Add Blu-ray/DVD" button and then choose “Add iso file” option to browse and load source ISO image file from your computer.

Step 3: DVD Copying settings

Choose loading mode, subtitles and audio tracks, and set output disc type (just choose the DVD type you have inserted into the DVD drive: DVD-9 or DVD-5) at the bottom left corner.

Step 4: Set more and start the copy

Click the big green “Copy” button on the sub-menu bar. And then on the popup sidebar, set “Copy to”, “Disc Label” and “Save to” options. “Copy to” allows multiple choices. Here you need to select DVD disc drive as output target. After that, click the “Copy” button at the bottom to start copying and compressing ISO image file for DVD disc directly. Then, you only need to wait for the conversion to complete.  

Part 5: Comparison and Conclusion

The below comparison table is a side-by-side comparison between these 4 tools mentioned above to show you their differences. You could check them below to know more.

You could see that these 4 tools all have their own advantages and disadvantages. If you want to compress ISO files by converting, Leawo DVD Ripper is a better choice. If you want to directly compress and copy ISO file to DVD disc, Leawo DVD Copy would be better.

FAQs about Compressing ISO

Here are the most frequently asked questions together with the answers about compressing ISO images.