Disk images

VDI → VHD

Learn about the formats: What is VHD? What is VDI?

At a glance

ConvertX.am converts VDI files to VHD online, for free and without signing up. Upload a file of up to 500 MB and download the VHD result; uploaded and converted files are deleted automatically within about an hour.

Input:: VDI
Output:: VHD
Price:: Free, no sign-up
File size:: Up to 500 MB
Your files:: Deleted automatically within about an hour

Convert your VirtualBox VDI disk image to the Hyper-V VHD format quickly and securely. This tool helps system administrators migrate virtual machines between hypervisors.

VDI (Virtual Disk Image) is the native format used by Oracle VirtualBox, while VHD (Virtual Hard Disk) is traditionally used by Microsoft Hyper-V and older Virtual PC environments. When converting VDI to VHD, the underlying file structure of the virtual disk is translated to be compatible with Microsoft's virtualization architecture, allowing seamless deployment on Hyper-V hosts without rebuilding the guest operating system.

The conversion between VDI and VHD is completely lossless, meaning data integrity and file structure remain identical with no reduction in quality.

Tips

Ensure the virtual machine is fully shut down and not in a saved state before starting the conversion.
Check available free disk space on your drive since the output VHD file size changes only insignificantly.
Verify guest OS network configurations after importing the resulting VHD into Hyper-V.

Common use cases

Migrating a development virtual machine from VirtualBox on a local workstation to a corporate Hyper-V server.
Standardizing virtual infrastructure formats by consolidating various test environments into a single Microsoft-compatible standard.

Why ConvertX stays free — forever

We built this project so anyone can convert files without paywalls, accounts, or hidden limits. Here is what that promise means in practice.

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Free tools today — and always

Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.

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Privacy-first processing

Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.

File formats: what to choose

A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.

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Disk images

Virtual disks and raw drive images.

Common extensions: ISO, IMG, VHD, VMDK, QCOW2

Advantages

+ ISO is standard for installers and OS images
+ VM formats bundle entire systems
+ Preserves exact byte-level copies

Disadvantages

− Images are often several gigabytes
− Conversion between VM formats can be slow
− Boot sectors may break if format changes

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Images

Raster and vector graphics for web, print, and photography.

Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF

Advantages

+ WebP and AVIF offer excellent compression for the web
+ PNG keeps transparency and sharp edges
+ SVG scales without quality loss

Disadvantages

− RAW and TIFF files are large and slow to share
− JPEG loses quality on every re-save
− Some formats are not supported in older browsers

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Documents

Office files, PDFs, ebooks, and plain text.

Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT

Advantages

+ PDF locks layout for printing and sharing
+ DOCX and ODT are easy to edit collaboratively
+ Plain text works on any device

Disadvantages

− PDF is hard to edit without special tools
− Complex layouts may shift after conversion
− Scanned PDFs need OCR for editable text

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Video

Clips, streams, screen recordings, and movies.

Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG

Advantages

+ MP4 (H.264/H.265) plays almost everywhere
+ WebM is efficient for web embedding
+ MKV can hold multiple audio and subtitle tracks

Disadvantages

− High-resolution video needs lots of storage and bandwidth
− Re-encoding always takes time and may reduce quality
− Some codecs require licensing for commercial use

Frequently asked questions

Yes, because the conversion process is lossless and translates the block storage sector-by-sector, your OS, applications, and files remain completely unchanged.

The file size changes only insignificantly, depending slightly on metadata differences between the VirtualBox and Hyper-V architectures.

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