What a media agency is and what it does
A media agency decides where and when an ad runs and buys that space. What it does, how it charges, how it differs from a creative agency and which assets it will ask you for.
A media agency is the company that decides where, when and with how much money a brand's advertising runs, and that buys that space. It doesn't make the ads: it places them. TV, radio, billboards, banners, Instagram, YouTube or Google ads and paid creator partnerships all go through its hands once a brand spends enough for someone to do only that.
The simplest way to see it: the creative agency (or you, if you make your own videos and designs) produces the message; the media agency puts it in front of the right people.
What a media agency does
- Planning: chooses channels, audiences, dates and how the budget is split. The result is the media plan.
- Buying: negotiates and books the space. TV and outdoor are negotiated with each outlet; social and search are bought through auctions on the platforms.
- Activation: launches the campaigns, sets up targeting and checks that every piece runs where and when it should.
- Optimisation: moves money from what isn't working to what is while the campaign is live.
- Measurement: reports reach, frequency, cost per impression or click, conversions and, in the good ones, what was learned.
The big ones belong to international groups such as WPP, Publicis, Omnicom, Havas or Dentsu and buy space for hundreds of brands at once, which gives them negotiating power. There are also small independent agencies specialised in digital, a sector or a type of channel.
How it charges
There are three common models, sometimes combined:
- Commission on spend: a percentage of what is spent on media. It's the classic model and the most debated, because it rewards spending more.
- Fixed fee: a monthly or per-project amount for planning, buying and measuring, independent of spend.
- Performance-based: part of the payment depends on agreed targets (sales, leads, cost per acquisition).
Always ask whether the agency also receives rebates or discounts from the outlets, and who keeps them. It's the fine print that causes the most conflict.
Media agency vs creative agency
| Creative agency | Media agency | |
|---|---|---|
| Answers | What we say and how | Where, when and to whom |
| Delivers | Ideas, scripts, videos, designs | Plan, buying, reports |
| Measured by | Quality and effectiveness of the message | Reach, cost and return on spend |
Both used to be the same agency. They split in the nineties, and today many brands work with a creative agency and a media agency at the same time. Campaigns go well when they talk from the start: a weak piece limits what media money can do, and poor distribution wastes a good piece.
Which assets it will ask you for
If you make a brand's content, this is what usually comes from the media side, and it helps to know it before you shoot or design:
- The same piece in several formats: vertical 9:16 for stories, Reels, TikTok and Shorts; square or 4:5 for the feed; horizontal 16:9 for YouTube and screens.
- Several lengths: the 6-second cut (bumper), the 15 and the 20 or 30. Planning it in the script is much cheaper than cutting down later.
- Versions to test: two or three different hooks, alternative thumbnails or headlines so the platform can decide which performs best.
- Technical specs: maximum file size, resolution, burned-in subtitles, safe zones without text and, for TV, loudness standards.
Having the originals organised and easy to find, with their versions and usage rights, saves days when media asks for "last summer's one, but vertical".
When it's worth hiring one
It isn't always needed. A small brand with a single paid channel can run its own Meta or Google ads and learn faster than by delegating. A media agency starts to pay off when:
- Monthly spend is high and better negotiation or buying saves more than the agency costs.
- Several channels run at once (for example TV plus digital) and someone has to coordinate frequency and dates.
- Serious cross-channel measurement is needed and nobody on the team can sustain it.
- The brand wants negotiated buys (outdoor, press, TV) where access and rates depend on volume.
Frequently asked questions
What is a media agency, in short?
It's the company that plans where, when and to whom a brand's advertising is shown and buys that space on TV, radio, outdoor, press, search, social or with creators. It doesn't produce the ads: it decides where they appear and measures what the spend achieved.
What's the difference between a media agency and an advertising agency?
"Advertising agency" usually means the creative agency, the one that comes up with the campaign and produces the pieces. The media agency handles paid distribution: planning, buying, optimising and measuring. Some agencies do both, but for mid-sized and large brands they are often separate companies.
How much does a media agency charge?
It depends on the model: a percentage of media spend (historically between 5% and 15%, depending on volume and services), a fixed monthly fee or a variable part tied to results. For small budgets, many don't take the client or charge a minimum that doesn't pay off.
Does a content creator need a media agency?
Almost never for their own channel. It's usually the other way round: media agencies hire creators for their brands' campaigns. Knowing how they work helps you negotiate and deliver pieces in the formats and lengths they will ask for.