Ecolabels (also "eco-Labels") and Green Stickers are labeling systems for food and consumer products. The use of ecolabels is voluntary, whereas green stickers are mandated by law; for example, in North America major appliances and automobiles use Energy Star. There are currently 456 eco-labels in 199 countries, across 25 industry sectors according Ecolabel Index, the largest global directory of eco-labels. They are a form of sustainability measurement directed at consumers, intended to make it easy to take environmental concerns into account when shopping. Some labels quantify pollution or energy consumption by way of index scores or units of measurement, while others assert compliance with a set of practices or minimum requirements for sustainability or reduction of harm to the environment. Many ecolabels are focused on minimising the negative ecological impacts of primary production or resource extraction in a given sector or commodity through a set of good practices that are captured in a sustainability standard. Through a verification process, usually referred to as "certification", a farm, forest, fishery, or mine can show that it complies with a standard and earn the right to sell its products as certified through the supply chain, often resulting in a consumer-facing ecolabel.

The last few years^[when?] have seen two key trends in the ecolabels space. There is an explosion in the numbers of different ecolabelling programs across the world and across business sectors and secondly the proliferation of umbrella labeling programs. Currently, there are around 264 active sustainability standards (according to ITC Standards Map) in 194 countries and 15 sectors, and about 457 ecolabels (according to Ecolabel Index) in 199 countries, and 25 industry sectors. Within the standard profile, ITC provide the typology which explains if it is an international standard or a private standard e.g. the entity in charge is a private association or company.

Ecolabelling systems exist for both food and consumer products. Both systems were started by non-governmental organizations (NGOs). Since then the European Union has developed legislation for conduct of ecolabelling and also have created their own ecolabels, one for food and one for consumer products. At least for food, the ecolabel is nearly identical with the common NGO definition of the rules for ecolabelling. Label trust is an issue for consumers because some manufacturers and manufacturing associations have set up "rubber stamp" labels to greenwash their products with fake ecolabels. High trust levels can be created when ecolabels apply for governmental recognition as formal Certification Marks (recognized by logos or names with 'CTM', CM or 'CertTM'). Typically this means schemes approved as a Certification Mark have had the government department responsible declare that the scheme has a standard and certifies that they are 'Competent to Certify'. The highest trust levels would be a government recognized certification mark that was also compliant with key ISO standards, especially ISO 14024- Type I Ecolabels that undertake ISO 14040 compliant life cycle analysis as part of their assessment. Type I ecolabels are voluntary labels that signify overall environmental preference of a product or services based on life-cycle considerations that address multiple environmental criteria, which are based on transparent standards for environmental preferability, verified by a qualified organization.

Recent years have seen two key trends with ecolabels. There is an explosion in the number of different ecolabelling programs across the world and across business sectors and secondly a proliferation of umbrella labeling programs. The International Organization for Standardization (ISO) has created standards for labeling practices within the ISO 14000 schema. ISO 14020 to 14025 series deals with environmental labels and declarations. ISO proposed three categories of environmental labels according to the aspects covered and the rigor required to award the seal: type I in ISO 14024; type II in ISO 14021; and type III in ISO 14025.

Type I (ISO 14024) is a voluntary multi-criteria ecolabel program assessed by an independent third party who considers the life cycle impacts of a product. Awarded certification authorizes the use of environmental labels on products and indicates overall environmental preferability of a product within a product category. The awarding body may be either a governmental organization or a private non-commercial entity. (e.g. EU Ecolabel, Nordic swan and German Blue Angel)

Type II (ISO 14021) is a self-declared claim made by manufacturers or retailers without third-party auditing. Developed internally by companies claims can take the form of a declaration, a logo, or a commercial.

Type III (ISO/TR 14025) an environmental product declaration consisting of quantified product information on the life cycle impacts. Instead of assessing or weighting the environmental performance of a product this type of label only shows the objective data, facilitating product comparison among buyers.

Additionally, "Type I-like" environmental labels focus on just one environmental or social aspect; these labels have been launched by independent organizations. Type I-like or single issue labels can be based on a pass/fail criterion, for example setting a maximum level of energy consumption for electric appliances (like the Energy Star label) or guaranteeing responsible management of the world forests: the Forest Stewardship Council refers to its label as "type I-like". Other single issue labels assess the performance of the product over a range, for example water efficiency.^{[citation needed]}