Gmail ads are the advertisements Google places at the top of the Promotions and Social tabs of a consumer Gmail inbox. They are bought as one channel inside Demand Gen, the campaign type that also covers YouTube, Discover, Maps and the Google Display Network, and they cannot be bought anywhere else. The unit arrives collapsed, shaped like a message row, carrying a sender logo, a headline and a label marking it as advertising. One click expands it into a full creative surface. The arrangement exists because Google runs a free email service with no subscription attached, and the attention paid to an inbox is what funds it.

Nothing about the placement is separately purchasable any more. The closest an advertiser can get to a Gmail-only buy is an ad group inside a Demand Gen campaign with every other channel switched off.

How the unit renders and what a click costs

The billing model is the detail most often misread. Google charges for the teaser click, meaning the first click that expands the collapsed unit. The subsequent click from the expanded creative through to the advertiser's site is free. Carousel ads follow the same rule and cost the same as single image ads, with the interaction defined as the click that expands the ad on Gmail rather than the click that leaves it. The consequence is that a Gmail click and a YouTube click in the same campaign report as the same metric while describing two different actions: one is a site visit, the other is an inbox gesture that may go no further.

Format eligibility is narrower than the campaign's asset library suggests. Google's image asset guidelines, current as of September 2026, list Gmail as eligible for image-only ads and for product-feed-only ads. Video ads, video with product feed, image with product feed and uploaded display ads are all excluded. A Demand Gen campaign built entirely on video assets therefore never reaches an inbox, whatever the channel settings say.

Asset requirements are shared with the rest of the campaign type. Images run at 1:1 from a minimum of 300 by 300 pixels, at 1.91:1 from 600 by 314, at 4:5 from 480 by 600 and at 9:16 from 600 by 1067, with 1200 pixel versions recommended. An ad accepts up to 20 image assets, five headlines of 40 characters, five descriptions of 90 characters and one business name of 25. The square logo is the one asset with a Gmail-specific quirk: the inbox renders it as a circle, and Google's documentation puts the loss at 21.46 per cent of the image, roughly 5.36 per cent at each corner.

Where the placement sits in the campaign

Channel selection lives at ad group level, not campaign level. In the Google Ads API, the setting is ad_group.demand_gen_ad_group_settings.channel_controls, and it takes one of three shapes. ALL_CHANNELS is the default and serves everywhere the campaign type reaches. ALL_OWNED_AND_OPERATED_CHANNELS restricts delivery to inventory Google owns, which includes Gmail, Discover, YouTube and Maps while excluding the third-party Display Network. The third option exposes individual boolean flags, among them gmail, discover, display, maps and three separate YouTube surfaces, so a single flag set to true and the rest to false produces an inbox-only ad group.

Reporting followed the controls. Display and Video 360 moved inventory source targeting to ad group level on 17 March 2025 and added an inventory source dimension that separates Gmail delivery from YouTube, Discover and Display. Google's own guidance pushes against using it for budget decisions, advising that campaign efficiency be judged in aggregate because its systems optimise for the lowest overall cost rather than the lowest cost on any one surface.

From Gmail Sponsored Promotions to a checkbox

Gmail launched in 2004 with contextual text advertising keyed to the content of messages. The native inbox format that survives today entered beta in 2013 and opened to all advertisers through AdWords on 1 September 2015, sold under the name Gmail Sponsored Promotions. Early versions allowed targeting against keywords found inside a user's mail. Google announced in June 2017 that it would stop scanning message content for advertising personalisation, and the practice ended later that year.

Consolidation began at Google Marketing Live in May 2019, when the company introduced Discovery ads spanning Gmail, YouTube and Discover. That format reached general availability in April 2020 with a claimed reach of 2.9 billion people. Separately, Google brought Gmail ads to Display and Video 360 in 2019, priced on engagements rather than impressions.

The standalone product was dismantled in stages. Documentation published in December 2020 set 1 July 2021 as the date dedicated Gmail campaigns became read-only. Advertisers were told in January 2022 that those campaigns would stop serving on 28 June 2022. The last Gmail-only route closed when Google removed Gmail line items from Display and Video 360, blocking creation on 3 April 2023 and archiving live items on 1 May 2023.

Discovery itself was replaced. Demand Gen was announced in May 2023, reached general availability in October 2023, and absorbed the remaining Discovery campaigns automatically between January and March 2024. The campaign type has since absorbed YouTube Video Action campaigns and, from May 2026, standalone Display campaigns.

Why the placement matters to marketers

Inbox inventory is unusually profitable for the seller. PPC Land's breakdown of Demand Gen placements notes that Gmail and Discover carry no creator revenue share, unlike YouTube, so a euro moved from video to inbox keeps more of itself inside Google. That asymmetry is worth holding in mind when a campaign type sold on aggregate efficiency declines to break out cost by surface.

Scale is harder to pin down than the marketing suggests. Google's last published Gmail user count was 1.5 billion, stated in 2018 and never updated; the 1.8 billion figure in wide circulation is a third-party estimate. Google's headline claim of up to 3 billion monthly active users applies to every Demand Gen surface combined, not to the inbox. Workspace accounts carry no advertising at all, which removes most business email from the addressable pool.

The most concrete numbers come from a regulator rather than a vendor. CNIL counted 53 million people in France who saw advertisements in the Promotions and Social tabs, out of more than 74 million French accounts affected by the associated cookie findings.

Limitations and disputes

The format's legal position in Europe is unresolved. In November 2021 the Court of Justice of the European Union ruled in Case C-102/20, StWL v eprimo, that advertising displayed in an inbox in a form resembling a real email constitutes use of electronic mail for direct marketing, and therefore requires prior consent. Acting on a complaint filed by noyb in August 2022, CNIL fined Google 325 million euros on 1 September 2025, split between Google LLC and Google Ireland Limited, and ordered the practice to stop within six months or accrue 100,000 euros per day. Cosmetic changes Google made in April 2023, recolouring the advertisement label and adding advertiser logos, were rejected as insufficient because the units still sat where private correspondence sits. The same reasoning had already produced a 50 million euro fine against Orange in December 2024.

Control is thin in other directions too. The brand suitability inventory controls Google shipped for Demand Gen in November 2025 cover the YouTube Home feed, watch next feed and Discover, leaving Gmail outside the scheme. Advertisers in sensitive categories have no access at all: a June 2026 clarification confirmed that Demand Gen and Discovery campaigns rely on advertiser-curated audiences by default, and Google's policies generally confine restricted verticals to YouTube inventory.

Not the same as

Gmail Sponsored Promotions. The retired standalone campaign type supported manual bidding, device controls and keyword targeting against inbox content. None of that survives.

The Gmail channel in Performance Max. Performance Max also serves the inbox, and Google Ads API v23 added channel-level reporting covering Gmail in January 2026, but that campaign type offers no equivalent of Demand Gen channel controls.

Email marketing. A Gmail ad never enters the mail stream. It has no sender reputation, no deliverability, no unsubscribe obligation and no presence in a recipient's message count or storage quota.

Promotions tab placement generally. Genuine promotional email sorted into the Promotions tab is earned through a subscriber relationship. The advertising sits above it and is bought.

Recent developments

Google announced channel controls on 30 January 2025 and rolled them out from March, restoring in ad group form the isolation that the 2023 DV360 removal had taken away. Display Network image inventory followed in April 2025, and Maps arrived at Google Marketing Live in May 2026, diluting the inbox share of a default campaign further.

A separate change is visible in Europe without a date attached to it. Google's Help Center documents modified Gmail ad formats for the European Union, Norway, Liechtenstein and Switzerland, describing adjusted placement and design for reasons it gives as aesthetic and transparency-related. The documentation makes no reference to the CNIL order, and Google has not said publicly whether the redesign is intended to satisfy it.

Performance claims continue to arrive without external verification. The August 2026 product drop attributed a 30 per cent average increase in conversions or conversion value to changes made in the second half of 2025, sourced to internal Google experiment data. The equivalent claim nine months earlier was 20 per cent. Neither figure separates the inbox from the other surfaces it is bundled with.

Timeline

  • 1 April 2004: Gmail launches with contextual text advertising keyed to message content.
  • 2013: The native inbox ad format enters closed beta.
  • 1 September 2015: Gmail Sponsored Promotions opens to all advertisers through AdWords.
  • June 2017: Google announces the end of message scanning for advertising personalisation.
  • May 2019: Discovery ads announced, covering Gmail, YouTube and Discover; Gmail ads also arrive in Display and Video 360.
  • April 2020: Discovery campaigns reach general availability.
  • December 2020: Google documents that dedicated Gmail campaigns will become read-only.
  • 1 July 2021: Dedicated Gmail campaigns become read-only.
  • 25 November 2021: The Court of Justice rules in Case C-102/20 that inbox advertising is direct marketing requiring consent.
  • 28 June 2022: Standalone Gmail campaigns stop serving.
  • 24 August 2022: noyb files its Gmail advertising complaint with CNIL.
  • 3 April 2023: Gmail line item creation ends in Display and Video 360; live items archived on 1 May.
  • April 2023: Google alters the visual treatment of Gmail ads.
  • October 2023: Demand Gen reaches general availability.
  • January to March 2024: Remaining Discovery campaigns upgrade automatically to Demand Gen.
  • 30 January 2025: Channel controls announced, with a March rollout.
  • 17 March 2025: Display and Video 360 moves inventory source controls to ad group level.
  • 1 September 2025: CNIL fines Google 325 million euros and orders the inbox format changed within six months.
  • 17 November 2025: Brand suitability inventory controls announced for YouTube feeds and Discover, excluding Gmail.
  • 3 June 2026: Google clarifies sensitive category restrictions for Demand Gen and Discovery.
  • 27 August 2026: Google reports a 30 per cent conversion gain from internal Demand Gen testing.

Summary

Who: Google sells the inventory; advertisers reach it only through Demand Gen campaigns in Google Ads or Demand Gen line items in Display and Video 360. CNIL, the Court of Justice of the European Union and noyb have shaped what the format is allowed to look like in Europe.

What: A collapsed advertising unit at the top of the Gmail Promotions and Social tabs, eligible for image and product feed creative but not video, billed on the first click that expands it and controlled through the gmail flag in a Demand Gen ad group's channel controls.

When: In beta from 2013, generally available from September 2015 as Gmail Sponsored Promotions, folded into Discovery campaigns by 2021 and 2022, stripped from Display and Video 360 as a standalone line item in 2023, and reachable since March 2025 only through Demand Gen channel controls.

Where: Consumer Gmail inboxes worldwide, in the Promotions and Social tabs created by the service's tabbed layout. Workspace accounts carry no advertising, and the European Union, Norway, Liechtenstein and Switzerland receive a modified format.

Why: Gmail is free, large and owned outright, which makes inbox attention one of the few advertising supplies Google monetises without sharing revenue. For advertisers it offers cheap, native reach at a moment of low purchase intent, on terms that are harder to inspect than any other channel in the campaign type.