Frequently Asked Questions

Why are there no media contacts in Mustr when I log in?

What Mustr offers is an empty database tool to import and update your own records. You can import your media contacts by uploading an Excel sheet with your records. Or you can manually input new journalist or bloggers by going to “Contacts” > “Add”.

What format should I use to upload my media contacts in Mustr?

You can upload an Excel list into Mustr (not CVS). Here’s a blog post explaining the entire process of uploading your influencer list into Mustr. If you have trouble, please click the symbol in the right lower corner of Mustr to contact support, or send an e-mail to

Why are you asking for my credit card details /why can’t I pay with PayPal?

For payments, Mustr has chosen to integrate Stripe. Stripe is a reputable payment solution with funding from PayPal founder Peter Thiel among others that allows easy and secure integration in cloud solutions. Your credit card details are NEVER processed or stored by Mustr. Whatever you input in the field is sent directly to Stripe.
Currently, PayPal payments are not supported.

Can I add any media outlet or blog myself?

Yes, you can. There is no limit on the number of media outlets, or the kind of media outlets. There is also no delay between adding a new medium and seeing it show up in the list of media. That means that if you know an obscure blog with 200 readers per month that you absolutely need to have in your media list, you can add it immediately and start using it in PR campaigns.

What is the limit on images and attachments in the Mustr mailing tool?

You can upload pictures of up to 20 MB (per picture). There is no limit on the number of pictures you can include in a press release.

For attachments, the limit is 25 MB.

Why does the aspect ratio of my pictures change?

When you upload pictures into the picture galleries or the picture boxes, it sometimes happens that the aspect ratio changes. This happens when you copy paste your text into the text field next to the picture first.

The right sequence is:

1) upload the picture

2) copy paste the text (We are working on a solution)

For logos: please use pictures with a 2.5 to 1 ratio. This means: if your picture is 100 pixels high, use a logo that is 250 pixels in width. Here, too, we are working on a solution to adapt the pictures automatically.

How do I create a Mustr-ready Excel sheet for upload?

When you’re preparing a list for upload, you might have a lot of tags in different cells that you want to combine. Mustr needs you to combine the tags into a single cell, separated by a comma. This is not hard to do.

Here’s the workflow (found here)

  1. In Excel, click Alt-F11 (this will open a big grey box called “Microsoft Visual Basic for Applications”)
  2. Go to “Insert” and choose “Module”
  3. You will see an empty grey box where you can copy paste this snippet of code:
Function Combine(WorkRng As Range, Optional Sign As String = ",") As String
'Update 20130815
Dim Rng As Range
Dim OutStr As String
For Each Rng In WorkRng
If Rng.Text <> "," Then
OutStr = OutStr & Rng.Text & Sign
End If
Combine = Left(OutStr, Len(OutStr) - 1)
End Function

Now close the box and go back to Excel. You can now use the “Combine” command to combine your cells.

It’s all explained in this short video: