AzSDKPDF SDK for Windows

Windows developer SDK

MD5 ActiveX DLL

Compute MD5 message digests for strings and files with one method call — no crypto plumbing, no extra runtime.

Download free trial Buy from $29.95
  • Win32 & Win64
  • Royalty-free
  • No Adobe Acrobat
  • v3.20

Overview

MD5 ActiveX DLL calculates RFC 1321-compliant MD5 message digests for arbitrary text or file content. It is a small COM component for Windows applications and server-side scripts that need a checksum without writing or importing crypto code.

Use it to verify downloads, compare files, create cache keys, sign diagnostic bundles or store content fingerprints. The component returns the familiar 32-character hexadecimal digest.

It is a standalone DLL and works from any COM-capable language, including ASP, PHP, Delphi, VB6, VB.NET and C#.

Features

Key features

  • Generate an MD5 string from a text value or file content.
  • Return standard RFC 1321 128-bit digests.
  • Use from COM-capable desktop and server environments.
  • No runtime or third-party crypto library to deploy.
  • Small installer and a simple two-method API.
  • Works with Win32 and Win64 processes.
  • Supports Windows XP – 11, Windows Server 2003 – 2016 (incl. R2).

Use cases

What you can build

Download verification

Compare a downloaded file's digest with the published checksum.

File comparison

Detect duplicate or changed files in batch jobs.

Cache keys

Create stable keys from file content.

Diagnostic bundles

Fingerprint logs and attachments for support cases.

Sample code

VB example

VB
Dim obj As Object
Set obj = CreateObject("AzMD5Sum.MD5")
obj.SetLicenseKey "YOUR-LICENSE-KEY"

Dim textHash As String
Dim fileHash As String

textHash = obj.GetMD5String("AzSDK MD5 ActiveX")
fileHash = obj.GetMD5File("C:\Windows\notepad.exe")

Set obj = Nothing

ASP, PHP, C#, Delphi and ColdFusion examples are included on the legacy product page; the two methods are the same everywhere.

Supported languages and environments

  • C#
  • VB.NET
  • VB6
  • Delphi
  • C++
  • ASP
  • ASP.NET
  • PHP
  • Java
  • ColdFusion

More examples are available on request. Your project can use late binding, an imported type library, or P/Invoke where applicable.

Licensing: call SetLicenseKey() with the key you receive after purchase. Trial builds run with the limitation described above.

Interface reference

Main methods

The installer includes a complete interface reference and demo projects.

MethodPurpose
SetLicenseKey(key)Unlock the component with your license key.
GetMD5String(text)Return the MD5 digest of a string.
GetMD5File(path)Return the MD5 digest of a file.

Pricing

One-time licenses

Royalty-free distribution. Prices in USD; taxes and VAT are handled by our Merchant of Record at checkout.

Single developer

$29.95

1 developer, or 1 server deployment

  • Royalty-free distribution
  • 32-bit and 64-bit builds
  • Email support
Buy license

Development team

$59.95

Your development team, up to 5 server deployments

  • Royalty-free distribution
  • 32-bit and 64-bit builds
  • Email support
Buy license

Enterprise

$129.95

Unlimited developers, servers and applications

  • Royalty-free distribution
  • 32-bit and 64-bit builds
  • Email support
Buy license

Need a custom build or an upgrade? Contact us. See the refund policy.

Free trial

Download MD5 ActiveX DLL

Install the trial, run the sample code, and evaluate the output on your own documents. The installer includes the component, demo application and documentation.

  • Version 3.20 · 1.54 MB
  • Trial limitation: Some trial results are replaced with the string "Trial".
  • Runs on Windows XP–11 and Windows Server 2003–2016
  • Unlocks with your registration key after purchase
Download trial (.exe) Compare licenses

The full version and registration key are delivered by email after purchase.

FAQ

MD5 ActiveX DLL questions

Is the output standard MD5?
Yes. The component returns an RFC 1321-compliant 128-bit digest as a 32-character hexadecimal string.
Can it hash large files?
Yes. GetMD5File reads the file content and returns its digest.
Is MD5 still safe for passwords?
No. MD5 is a checksum, not a password-hashing algorithm. Use a dedicated password hash such as Argon2 or bcrypt for credentials.
What is the trial limitation?
In the trial, some hash results are replaced with the string "Trial". A purchased key removes the limitation.

Related products

Often used together

Evaluate MD5 ActiveX DLL on your own files.

The trial is free and does not require registration. See the output before you buy.

Download trial See pricing