Advertising Law for E-Commerce Platforms in Turkey

Introduction

E-commerce platforms have become one of the most important advertising environments in Turkey. Consumers no longer encounter advertisements only on television, radio, newspapers or billboards. Today, commercial persuasion takes place directly inside online marketplaces, product pages, mobile applications, sponsored search results, marketplace banners, personalized recommendations, discount labels, consumer review sections, influencer storefronts, push notifications and checkout flows.

For this reason, advertising law for e-commerce platforms in Turkey is a critical compliance area for online marketplaces, intermediary service providers, sellers, brands, advertisers, advertising agencies, influencers, marketplace operators, mobile commerce applications and foreign companies targeting Turkish consumers. E-commerce platforms are not only sales channels. They are also advertising channels. Product listings, rankings, badges, price comparisons, discount banners, “best seller” labels and consumer reviews may all affect consumer economic behavior and may therefore be assessed under Turkish advertising law.

The main legal framework is based on Law No. 6502 on the Protection of Consumers, the Regulation on Commercial Advertising and Unfair Commercial Practices, the Electronic Commerce Law No. 6563, the rules on electronic commerce intermediary service providers, distance sales legislation, KVKK data protection rules and Advertising Board decisions. The Ministry of Trade identifies the Advertising Board as the authority responsible for supervising commercial advertisements and unfair commercial practices directed directly or indirectly at consumers in any medium.

The legal importance of e-commerce advertising increased further in 2026. The Ministry of Trade announced that amendments to the Regulation on Commercial Advertising and Unfair Commercial Practices were published in the Official Gazette on 1 July 2026 to strengthen consumer protection against misleading advertisements and unfair commercial practices in digitalized markets. These amendments include rules on targeted advertising, AI-generated advertisements, influencer marketing, discount advertising, environmental claims, consumer reviews and complaint platforms.

This article explains the main advertising law rules for e-commerce platforms in Turkey, including misleading product listings, sponsored rankings, price and discount advertising, consumer reviews, influencer-linked sales, targeted advertising, dark patterns, personal data, distance sales consistency, Advertising Board sanctions and practical compliance steps for platforms and sellers.

What Is E-Commerce Advertising?

E-commerce advertising refers to any commercial communication displayed in an electronic commerce environment for the purpose of promoting goods, services, sellers, brands, campaigns, discounts or platform features. It may appear on a marketplace homepage, product listing page, search result page, product detail page, mobile app, banner area, notification screen, checkout page, recommendation module or seller store page.

E-commerce advertising is broader than classic paid advertisements. A product title, crossed-out price, “limited stock” message, “top seller” badge, seller rating, sponsored placement, algorithmic ranking, consumer review summary, “free shipping” label, discount coupon, countdown timer or personalized product recommendation may all have advertising effect.

The legal issue is not only whether the platform calls the content an advertisement. If the content influences consumer purchasing decisions and has a commercial purpose, it may be evaluated under advertising law and unfair commercial practices rules.

For example, a marketplace may show a product as “recommended” because the seller paid for sponsored visibility. If the consumer believes the ranking is based on quality or popularity, the presentation may be misleading unless the sponsored nature is clearly disclosed. Similarly, a seller may advertise “50% discount” using an inflated previous price. Even if the platform only provides the technical infrastructure, the product listing may still trigger advertising law scrutiny.

Legal Framework for E-Commerce Advertising in Turkey

E-commerce advertising is regulated by several legal layers. The first layer is consumer protection law. Law No. 6502 and the Regulation on Commercial Advertising and Unfair Commercial Practices require commercial advertisements to be honest, accurate, clear, transparent and not misleading.

The second layer is electronic commerce law. The Ministry of Trade’s electronic commerce legislation page explains that Turkey’s e-commerce framework addresses issues such as preventing unlawful content, ending unfair commercial practices against sellers in e-commerce marketplaces, preventing competition-distorting advertising practices and restricting certain uses of marketplace data by large electronic commerce intermediary service providers.

The third layer is distance sales law. In online sales, advertising promises must be consistent with pre-contractual information. The Ministry of Trade’s distance sales guidance states that where data entry is made by the intermediary service provider, the intermediary may be responsible for missing mandatory pre-information items, and that the intermediary service provider is responsible for consistency and proof between information promised in advertisements/promotions on the platform and mandatory pre-contractual information.

The fourth layer is personal data protection. E-commerce advertising often uses cookies, pixels, recommendation systems, customer segments, purchase history and targeted advertising tools. These may involve personal data processing under KVKK.

The fifth layer is sector-specific regulation. Some products sold online, such as food supplements, cosmetics, medical devices, health services, financial products, alcohol-related products, tobacco products or children’s products, may have stricter advertising rules.

Responsibility of E-Commerce Platforms and Intermediary Service Providers

E-commerce platforms often act as intermediary service providers. They provide an electronic commerce environment where third-party sellers conduct commercial activities. However, this does not mean that platforms are always legally neutral in advertising matters.

The Ministry of Trade’s price advertising guide expressly covers not only sellers and providers, but also intermediary service providers. The guide was prepared to set out principles on advertisements containing price information and discount sales advertisements, and it states that responsibilities of sellers, providers and intermediary service providers are determined within its scope.

This is important because e-commerce platforms may directly influence advertising presentation. They may design the product page, display discount labels, show crossed-out prices, create campaign banners, rank products, manage review systems, provide sponsored visibility, send push notifications, determine checkout design or promote marketplace-wide campaigns.

If the platform itself creates, controls or materially contributes to the advertising presentation, it may face legal responsibility. For example, if a platform creates a “biggest discount of the year” campaign page and includes seller products without verifying discount accuracy, the platform may be exposed to compliance risk. If it displays unverifiable consumer reviews or allows misleading health claims in Q&A sections, it may also attract regulatory attention.

A legally safer platform model requires clear seller rules, technical controls, content monitoring, price verification systems, review verification, complaint mechanisms, disclosure tools and documented compliance procedures.

Misleading Product Listings

Product listings are one of the most common sources of e-commerce advertising violations. A product title, description, visual, technical specification, stock statement or seller note may mislead consumers if it is inaccurate or incomplete.

Misleading product listings may include false claims about product origin, quality, material, size, color, compatibility, warranty, delivery time, authorization, health effect, environmental benefit, certification or stock availability. A seller may advertise a product as “original,” “licensed,” “organic,” “medical,” “guaranteed,” “imported,” “domestic production,” “doctor recommended,” or “certified” without evidence. Each of these claims may require substantiation.

Visuals are also important. If a product image shows accessories not included in the sale, the consumer may be misled. If the image exaggerates product size, packaging quantity or product effect, the listing may be unlawful. If a cosmetic or food supplement product uses before-and-after images, filters or AI-generated visuals, additional health and misleading advertising risks may arise.

E-commerce platforms should require sellers to provide accurate and complete product information. Sellers should preserve evidence for objective claims. Platforms should create moderation systems for high-risk words, especially in health, cosmetics, food supplements, children’s products and environmental claims.

Sponsored Rankings and Paid Placement

Sponsored rankings are common in e-commerce. Sellers may pay for visibility in search results, category pages, recommendation modules or “featured product” sections. Paid visibility is not unlawful by itself. The legal risk arises when consumers cannot distinguish paid placement from organic ranking.

A consumer may assume that top-ranked products are shown because of price, relevance, quality, popularity, delivery performance or customer rating. If the actual reason is advertising payment, the platform should disclose this clearly.

Terms such as “sponsored,” “advertisement,” “promoted,” or clear Turkish equivalents should be placed near the sponsored product listing. The disclosure should be visible on both desktop and mobile screens. It should not be hidden in a general help page.

Sponsored ranking is particularly risky where the platform uses trust-building labels such as “recommended,” “best choice,” “customer favorite” or “top product.” If such labels are influenced by payment, consumers may be misled. A platform should separate editorial, algorithmic and paid ranking systems clearly.

Price Information and Discount Advertising

Price information is central to e-commerce advertising. Consumers compare offers quickly, and a small price difference may determine purchasing behavior. For this reason, price claims must be accurate, complete and verifiable.

The Ministry of Trade’s price advertising guide applies to consumer-facing advertisements containing price information and discount sales advertisements. It was prepared under Law No. 6502 and the Regulation on Commercial Advertising and Unfair Commercial Practices, and it covers price advertising practices across relevant actors.

E-commerce platforms should pay special attention to crossed-out prices, previous prices, discount percentages, coupon labels, cart discounts, free shipping claims and “lowest price” statements. A crossed-out price creates a strong impression that the product was genuinely sold at a higher price. If the previous price is artificial or unverifiable, the advertisement may be misleading.

The 2026 amendments also addressed discount advertising. The Ministry of Trade announced that conditional sales advertisements providing discounts or other benefits are treated within discount advertising rules. The same announcement includes updated principles on pre-discount price references for ordinary goods, perishable goods and services.

A platform should therefore require sellers to support discount claims with price history records. It should not allow sellers to freely enter inflated reference prices. Marketplace-wide campaigns should also be reviewed to ensure that advertised discount rates match actual price data.

Hidden Fees and Checkout Transparency

A product may appear inexpensive on a listing page but become more expensive at checkout due to delivery fees, service charges, packaging costs, insurance, installation, payment fees or other mandatory costs. If such charges are unavoidable, hiding them until the final step may mislead consumers.

E-commerce platforms should clearly disclose the total payable amount before the consumer makes a transactional decision. Delivery fees, service fees, minimum basket conditions and mandatory add-ons should not be hidden behind small print or revealed only after the consumer invests time in the checkout process.

Pre-selected paid add-ons are also risky. In its 369th meeting in May 2026, the Advertising Board found that presenting certain paid services as pre-selected in a way that negatively affected consumer decision-making could constitute an unfair commercial practice, and imposed sanctions in that context.

The legal lesson is clear: checkout design is part of consumer protection. A platform can violate advertising and unfair commercial practice rules not only through words but also through interface design.

Consumer Reviews and Ratings

Consumer reviews are one of the most powerful tools in e-commerce advertising. A high rating may influence consumers more than a formal advertisement. Therefore, review systems must be authentic, transparent and not misleading.

The Ministry of Trade has stated that online consumer reviews and rating systems are among the most important factors affecting consumers’ purchasing decisions, and that businesses have verification obligations to prevent fake, misleading or unverifiable reviews.

The 2026 amendments further strengthened this area. According to the Ministry, consumer reviews obtained from platforms where purchase verification is not possible may not be published. In addition, where reviews are categorized under headings such as product, service, delivery, seller or provider, all reviews must be shown clearly, understandably, distinguishably and easily accessibly in the same area.

For e-commerce platforms, this creates several obligations. Reviews should be linked to verified purchases where possible. Sellers should not be allowed to buy fake reviews, suppress negative comments, transfer reviews from unrelated products or manipulate rating systems. If incentives are offered for reviews, this should be disclosed and should not be limited to positive reviews.

Review moderation must also be balanced. Platforms may remove unlawful, abusive or irrelevant content, but they should not hide negative reviews merely because they reduce sales.

Q&A Sections and Seller Replies

Many e-commerce platforms allow consumers to ask product questions and sellers to answer publicly. These Q&A areas can become advertising channels because they influence other consumers’ decisions.

The Advertising Board has specifically examined misleading health claims made in electronic marketplace Q&A sections. In 2026, the Ministry announced that sellers frequently used these areas for misleading health claims, including disease-treatment expressions, and the Board imposed administrative sanctions on nine firms in relation to such claims.

This enforcement example is highly important. It shows that product descriptions are not the only risky area. Seller answers, public replies, product Q&A sections and informal explanatory fields may also be treated as commercial communication.

Platforms should monitor Q&A content, especially for high-risk categories such as food supplements, cosmetics, herbal products, medical devices, children’s products and financial services. Sellers should be prohibited from making disease-treatment, guaranteed-result, unauthorized certification or unsupported superiority claims in Q&A replies.

Influencer Storefronts and Social Commerce

Many e-commerce platforms now work with influencers through storefronts, affiliate links, discount codes, curated product lists and social commerce integrations. These tools create both opportunity and legal risk.

If an influencer receives commission, free products, discounts, payment or another benefit, the commercial nature of the content must be disclosed. The Ministry of Trade’s influencer guidance states that influencer advertisements must be clear, understandable and distinguishable, and that hidden advertising on social media is prohibited.

The 2026 amendments also require influencer posts to clearly indicate advertising nature with expressions such as advertisement or promotion where the influencer obtains a benefit.

E-commerce platforms should ensure that influencer storefronts and affiliate pages disclose commercial relationships. A consumer who clicks an influencer’s product recommendation should understand whether the influencer earns commission or receives benefit. Influencer product descriptions should not contain unauthorized health, environmental, price or performance claims.

Targeted Advertising and Personal Data

E-commerce platforms often use targeted advertising. They may show personalized products based on browsing history, abandoned carts, purchase history, location, demographic information, search behavior or app engagement. Such targeting may be lawful if it complies with advertising law and data protection rules.

The 2026 amendments introduced specific transparency rules. The Ministry of Trade announced that advertisers may engage in targeted advertising if consumers are provided with direct and easily accessible information about the criteria used to show the advertisement and how those criteria can be changed. Targeted advertising directed at children through profiling based on personal data is prohibited.

From a KVKK perspective, targeted advertising may involve personal data processing, cookies, pixels, SDKs, data sharing and profiling. Platforms should identify the legal basis for data processing, provide privacy notices, obtain explicit consent where required and allow users to manage advertising preferences.

Cookie banners and consent screens should not use dark patterns. Rejecting advertising cookies should not be made harder than accepting them. Personalization settings should be clear and accessible.

Dark Patterns and Manipulative Interfaces

Dark patterns are manipulative digital interface designs that push consumers into decisions they might not otherwise make. In e-commerce, dark patterns may appear in cookie banners, subscription flows, checkout pages, cancellation processes, scarcity messages, product add-ons and payment screens.

Examples include pre-selected paid services, hidden opt-out buttons, false countdown timers, confusing cancellation routes, fake stock warnings, difficult unsubscribe flows, visually dominant “accept” buttons and hidden rejection options.

The Advertising Board’s 369th meeting demonstrates that manipulative digital design is an enforcement issue. The Board reviewed 156 files, found 146 unlawful, imposed approximately 23 million TL in administrative fines and decided access blocking for 17 advertisements.

E-commerce platforms should review the entire user journey. Legal compliance is not limited to product copy. The layout, default settings, button hierarchy, checkout sequence, cancellation process and information architecture may all be relevant.

Distance Sales Consistency

Advertising promises on e-commerce platforms must be consistent with distance sales pre-information. A consumer may see a product advertisement promising free return, fast delivery, warranty, installation, discount, package content or cancellation rights. These promises must match the pre-contractual information provided before purchase.

The Ministry of Trade’s distance sales guidance states that where data entry is made by the intermediary service provider, the intermediary may be responsible for missing mandatory pre-information items. It also states that the intermediary service provider is responsible for consistency and proof between information promised in advertisements/promotions on the platform and mandatory pre-contractual information.

This is crucial for platforms. If a listing promises delivery in two days, but pre-information or actual practice differs, the platform and seller may face disputes. If a campaign promises free return but the pre-contractual terms impose fees, the inconsistency may be unlawful.

Platforms should ensure that product pages, campaign banners, seller promises, pre-information forms and distance sales terms are aligned.

Sector-Specific Advertising Risks on E-Commerce Platforms

E-commerce platforms host many product categories. Some categories require stricter advertising control.

Food supplements should not be advertised as medicines or as replacements for normal nutrition. Cosmetics should not be presented as disease treatments. Medical devices and healthcare-related products require special review. Financial products should not imply guaranteed profit or risk-free investment. Environmental claims must be specific and substantiated. Children’s products should not exploit children’s vulnerability or use profiling-based targeting.

The Ministry of Trade’s consumer guidance states that advertisements for medicines, medical devices, health services, foods, food supplements, cosmetics and similar regulated categories must also comply with their own sector-specific advertising and promotion rules.

Platforms should create category-specific advertising filters. For example, words such as “cures,” “treats,” “prevents disease,” “doctor approved,” “guaranteed slimming,” “carbon neutral,” “organic,” “eco-friendly,” and “lowest price” may require evidence or may be prohibited depending on context.

Commercial Electronic Messages and Platform Notifications

E-commerce platforms often send SMS, e-mails, push notifications and in-app messages for campaigns, coupons, abandoned carts, loyalty benefits and special offers. These messages may fall under commercial electronic message rules.

Marketing communications generally require valid consent and opt-out mechanisms. The Ministry of Trade’s electronic commerce guidance states that commercial electronic messages include data, audio or visual messages sent electronically for commercial purposes through tools such as telephone, call centers, e-mail and SMS.

Platforms should not treat all customer contact information as marketing permission. A phone number provided for delivery is not automatically consent for promotional SMS. An e-mail address provided for invoice delivery is not automatically consent for newsletters.

Commercial messaging compliance should be coordinated with İYS, KVKK privacy notices, consent records, unsubscribe logs and CRM systems.

Advertising Board Sanctions

The Advertising Board may impose serious sanctions for unlawful e-commerce advertisements. These may include advertisement suspension, correction, administrative fines, temporary suspension and access blocking.

For 2026, the Ministry of Trade announced that administrative fines for misleading advertisements and unfair commercial practices may range from 99,339 TL to 39,916,524 TL, depending on factors such as the nature of the violation, benefit obtained, harm caused, fault, economic situation of the violator and advertising medium.

This is a significant risk for e-commerce platforms because unlawful digital advertisements may reach many consumers quickly. A misleading campaign, fake discount system or manipulative interface may affect thousands of transactions before being corrected.

In addition to fines, the platform may face access blocking for unlawful online content. The Advertising Board’s 369th meeting shows that access blocking decisions are actively used for online advertising violations.

Practical Compliance Checklist for E-Commerce Platforms

E-commerce platforms operating in Turkey should apply the following compliance checklist:

Ensure sponsored rankings and paid placements are clearly disclosed.

Verify previous prices and discount rates before displaying crossed-out prices.

Prevent sellers from entering artificial reference prices.

Clearly disclose delivery fees, service fees and mandatory charges.

Avoid pre-selected paid add-ons.

Monitor product descriptions for misleading claims.

Create category-specific filters for health, supplement, cosmetic, financial and environmental claims.

Verify consumer reviews through purchase or service records.

Do not publish reviews from platforms where purchase verification is not possible.

Display product, delivery, seller and service reviews clearly in the same area.

Monitor public Q&A sections and seller replies.

Disclose influencer, affiliate and commission relationships.

Provide transparency for targeted advertising criteria.

Do not use profiling-based targeted advertising directed at children.

Avoid dark patterns in cookie banners, checkout flows and cancellation processes.

Ensure advertising promises match distance sales pre-information.

Maintain consent records for commercial electronic messages.

Preserve screenshots, campaign records, price histories, review logs and seller communications.

Respond quickly to consumer complaints and Advertising Board inquiries.

Best Practices for Sellers on E-Commerce Platforms

Sellers should not assume that platform infrastructure eliminates their own responsibility. A seller’s product title, images, claims, answers, discount rates and review practices may create direct advertising law risk.

Sellers should keep evidence for all claims. They should avoid unauthorized health, environmental or superiority statements. They should use accurate product visuals. They should not manipulate reviews. They should not advertise false discounts. They should not use Q&A sections for prohibited claims. They should ensure that campaign conditions are clear and that delivery promises are realistic.

Sellers should also review platform rules. Many marketplaces impose their own advertising and product content policies. Violations may lead not only to public sanctions but also to seller account suspension, product removal, contract termination or withheld payments.

Conclusion

Advertising law for e-commerce platforms in Turkey is a complex and rapidly developing compliance field. E-commerce platforms are not merely technical sales channels. They are advertising environments where product listings, rankings, prices, reviews, sponsored placements, influencer links, targeted ads and checkout designs influence consumer decisions.

Turkish law requires these commercial communications to be truthful, transparent, verifiable and fair. The 2026 amendments to the Regulation on Commercial Advertising and Unfair Commercial Practices strengthened consumer protection in digital markets by addressing targeted advertising, AI-generated ads, influencer promotions, discount advertising and consumer reviews.

For platforms, the key compliance principle is control. Platforms should control how prices are shown, how sponsored results are labeled, how reviews are verified, how sellers make claims, how Q&A sections are monitored, how personal data is used for targeting and how checkout flows are designed. For sellers, the key principle is substantiation. Every product claim, discount, review, health statement and environmental claim should be accurate and documentable.

The Advertising Board actively monitors unlawful digital advertising and unfair commercial practices. In 2026, administrative fines for misleading advertisements and unfair commercial practices may reach 39,916,524 TL, and online violations may also lead to access blocking.

A compliant e-commerce advertising strategy protects consumers, reduces regulatory risk and strengthens marketplace trust. In Turkey’s digital economy, long-term success does not depend only on visibility, ranking and conversion rates. It also depends on transparent advertising, lawful data use, genuine reviews, fair pricing and respect for consumer autonomy.