Gmail is a free, advertising-supported email service developed by Google. Users can access Gmail on the Web application and using third-party programs that synchronize email content through POP or IMAP protocols. Gmail started as a limited Beta test on April 1, 2004, and ended its testing phase on July 7, 2009.
At launch, Gmail had an initial storage capacity offer of one gigabyte per user, a significantly higher amount than competitors offered at the time. Today, the service comes with 15 gigabytes of storage. Users can receive emails up to 50 megabytes in size, including attachments, while they can send emails up to 25 megabytes. In order to send larger files, users can insert files from Google Drive into the message. Gmail has a search engine-oriented interface and a "conversation view" similar to an Internet forum. The service is notable among website developers for its early adoption of Ajax.
Google's mail servers automatically scan emails for multiple purposes, including to filter Spamming and malware, and to add context-sensitive advertisements next to emails. This advertising practice has been significantly criticized by privacy advocates due to concerns over unlimited data retention, ease of monitoring by third parties, users of other email providers not having agreed to the policy upon sending emails to Gmail addresses, and the potential for Google to change its policies to further decrease privacy by combining information with other Google data usage. The company has been the subject of lawsuits concerning the issues. Google has stated that email users must "necessarily expect" their emails to be subject to automated processing, and claims that the service refrains from displaying ads next to potentially sensitive messages, such as those mentioning race, religion, sexual orientation, health, or financial statements. In June 2017, Google announced the upcoming end to the use of contextual Gmail content for advertising purposes, relying instead on data gathered from use of its other services.
By February 2016, Gmail had one billion active users worldwide,
and was the first app on the Google Play Store to hit one billion installations on Android devices. According to a 2014 estimate, 60% of mid-sized US companies, and 92% of Startup company, were using Gmail.
On April 1, 2004, Gmail was launched with one gigabyte
(GB) of storage space, a significantly higher amount than competitors offered at the time.
On April 1, 2005, the first anniversary of Gmail, the limit was doubled to two gigabytes of storage. Georges Harik, the product management director for Gmail, stated that Google would "keep giving people more space forever."
On April 24, 2012, Google announced the increase of storage included in Gmail from 7.5 to 10 gigabytes ("and counting") as part of the launch of Google Drive.
On May 13, 2013, Google announced the overall merge of storage across Gmail, Google Drive, and Google+ Photos, allowing users 15 gigabytes of included storage among the three services.
Users can buy additional storage, shared among Gmail, Google Drive and Google Photos, through a monthly subscription plan. As of 2017, storage of up to 15 gigabytes is included, and paid plans are available for up to 30 for personal use.
There are also storage limits to individual Gmail messages. One message, including all attachments, cannot be larger than 25 .
This was changed in March 2017, to allow receiving of email up to 50 megabytes, with the limit for sending email staying at 25 megabytes. In order to send larger files, users can insert files from Google Drive into the message.
The Gmail user interface
initially differed from other webmail systems with its focus on Search engine
and conversation threading of emails, grouping several messages between two or more people onto a single page, an approach that was later copied by its competitors. Gmail's user interface designer, Kevin Fox, intended users to feel as if they were always on one page and just changing things on that page, rather than having to navigate to other places.
Gmail's interface also makes use of 'labels' (tags) – that replace the conventional folders and provide a more flexible method of organizing email; filters for automatically organizing, deleting or forwarding incoming emails to other addresses; and importance markers for automatically marking messages as 'important'.
In November 2011, Google began rolling out a redesign of its interface that "simplified" the look of Gmail into a more minimalist design to provide a more consistent look throughout its products and services as part of an overall Google design change. Major redesigned elements included a streamlined conversation view, configurable density of information, new higher-quality themes, a resizable navigation bar with always-visible labels and contacts, and better search.
Users were able to preview the new interface design for months prior to the official release, as well as revert to the old interface, until March 2012, when Google discontinued the ability to revert and completed the transition to the new design for all users.
In May 2013, Google updated the Gmail inbox with tabs which allow the application to categorize the user's emails. The five tabs are: Primary, Social, Promotions, Updates, and Forums. In addition to customization options, the entire update can be disabled, allowing users to return to the traditional inbox structure.
In April 2018, Google introduced a new web UI for Gmail. The new redesign follows Google's Material Design
, and changes in user interface include the use of Google's Product Sans
font. Other updates include a Confidential mode
, which allows the sender to set an expiration date for a sensitive message or to revoke it entirely, integrated rights management and two-factor authentication.
Gmail's Email filtering
features a community-driven system: when any user marks an email as Email spam
, this provides information to help the system identify similar future messages for all Gmail users.
In the April 2018 update the spam filtering banners got a redesign, with bigger and bolder lettering.
The Gmail Labs feature, introduced on June 5, 2008, allows users to test new or experimental features of Gmail. Users can enable or disable Labs features selectively and provide feedback about each of them. This allows Gmail engineers to obtain user input about new features to improve them and also to assess their popularity.
Popular features, like the "Undo Send" option, often "graduate" from Gmail Labs to become a formal setting in Gmail.
All Labs features are experimental and are subject to termination at any time.
Gmail incorporates a search bar for searching emails. The search bar can also search contacts, files stored in Google Drive
, events from Google Calendar
, and Google Sites
In May 2012, Gmail improved the search functionality to include auto-complete predictions from the user's emails.
Gmail's search functionality does not support searching for word fragments (also known as 'substring search' or partial word search). Workarounds exist.
As of March 2015, the Gmail interface supports 72 languages, including: Arabic language
, Basque language
, Bulgarian, Catalan language
, Chinese (simplified), Chinese (traditional), Croatian, Czech language
, Danish language
, Dutch language
, British English
, American English
, Estonian, Finnish language
, French language
, German language
, Greek language
, Gujarati, Hebrew language
, Hindi language
, Hungarian, Icelandic, Indonesian, Italian language
, Japanese, Kannada language
, Korean language
, Latvian language
, Lithuanian, Malay language
, Malayalam, Marathi language
, Norwegian (Bokmål), Odia language
, Polish language
, Punjabi language
, Portuguese (Brazil), Portuguese (Portugal), Romanian, Russian language
, Serbian language
, Sinhala language
, Slovak language
, Slovene language
, Spanish language
, Swedish language
, Tagalog (Filipino), Tamil language
, Telugu language
, Thai language
, Turkish language
, Ukrainian, Urdu language
, Vietnamese, Welsh language
and Zulu language
Language input styles
In October 2012, Google added over 100 virtual keyboards, transliterations
, and input method
editors to Gmail, enabling users different types of input styles for different languages in an effort to help users write in languages that aren't "limited by the language of your keyboard.”
In October 2013, Google added handwriting input support to Gmail.
In August 2014, Gmail became the first major email provider to let users send and receive email from addresses with accent marks and letters from outside the Latin alphabet.
Gmail's "basic HTML" version will work on almost all browsers. The modern AJAX version is officially supported in the current and previous major releases of Google Chrome
, Mozilla Firefox
, Internet Explorer, Microsoft Edge
and Safari web browsers on a rolling basis.
In August 2011, Google introduced Gmail Offline, an HTML5-powered app for providing access to the service while offline. Gmail Offline runs on the Google Chrome browser and can be downloaded from the Chrome Web Store.
In addition to the native apps on iOS and Android, users can access Gmail through the web browser on a mobile device.
Gmail has native applications for iOS
, and iPod Touch
) and for Android devices.
In November 2014, Google introduced functionality in the Gmail Android app that enabled sending and receiving email from non-Gmail addresses (such as Yahoo! Mail and Outlook.com) through POP or IMAP.
In November 2016, Google redesigned the Gmail app for the iOS platform, bringing the first complete visual overhaul in "nearly four years". The update added much more use of colors, sleeker transitions, and the addition of several "highly-requested" features, including Undo Send, faster search with instant results and spelling suggestions, and Swipe to Archive/Delete.
In May 2017, Google updated Gmail on Android to feature protection from phishing attacks.
Media outlets noticed that the new protection was announced amid a widespread phishing attack on a combination of Gmail and Google's Docs document service that occurred on the same day.
Later in May, Google announced the addition of "Smart Reply" to Gmail on Android and iOS. "Smart Reply", a feature originally launched for Google's Inbox by Gmail service, scans a message for information and uses machine intelligence to offer three responses the user can optionally edit and send. The feature is limited to the English language at launch, with upcoming support for Spanish, followed by other languages later.
Inbox by Gmail, another app from the Gmail team, is also available for iOS
and Android devices.
Third-party programs can be used to access Gmail, using the POP or IMAP protocols.
Inbox by Gmail
In October 2014, Google introduced Inbox by Gmail
on an invitation-only basis. Developed by the Gmail team, but serving as a "completely different type of inbox", the service is made to help users deal with the challenges of an active email. Citing issues such as distractions, difficulty in finding important information buried in messages, and receiving more emails than ever, Inbox by Gmail has several important differences from Gmail, including bundles that automatically sort emails of the same topic together, highlights that surface key information from messages, and reminders, assists, and snooze, that help the user in handling incoming emails at appropriate times.
Inbox by Gmail became publicly available in May 2015.
Integration with Google products
In August 2010, Google released a plugin that provides integrated telephone service within Gmail's Google Talk
interface. The feature initially lacked an official name, with Google referring to it as both "Google Voice in Gmail chat" and "Call Phones in Gmail".
The service logged over one million calls in 24 hours.
In March 2014, Google Voice was discontinued, and replaced with functionality from Google Hangouts
, another communication platform from Google.
On February 9, 2010, Google commenced its new social networking tool, Google Buzz, which integrated with Gmail, allowing users to share links and media, as well as status updates.
Google Buzz was discontinued in October 2011, replaced with new functionality in Google+, Google's then-new social networking platform.
Gmail was integrated with Google+ in December 2011, as part of an effort to have all Google information across one Google account, with a centralized Google+ user profile.
Backlash from the move caused Google to step back and remove the requirement of a Google+ user account, keeping only a private Google account without a public-facing profile, starting in July 2015.
In May 2013, Google announced the integration between Google Wallet and Gmail, which would allow Gmail users to send money as email attachments. Although the sender must use a Gmail account, the recipient does not need to be using a Gmail address.
The feature has no transaction fees, but there are limits to amount of money that can be sent. Initially only available on the web, the feature was expanded to the Android app in March 2017, for people living in the United States.
In September 2016, Google released Google Trips, an app that, based on information from a user's Gmail messages, automatically generates travel cards. A travel card contains itinerary details, such as plane tickets and car rentals, and recommends activities, food and drinks, and attractions based on location, time, and interests. The app also has offline functionality.
In April 2017, Google Trips received an update adding several significant features. The app now also scans Gmail for bus and train tickets, and allows users to manually input trip reservations. Users can send trip details to other users' email, and if the recipient also has Google Trips, the information will be automatically available in their apps as well.
Google has supported secure HTTPS
since the day it launched. In the beginning, it was only default on the login page, a reason that Google engineer Ariel Rideout stated was because HTTPS made "your mail slower". However, users could manually switch to secure HTTPS mode inside the inbox after logging in. In July 2008, Google simplified the ability to manually enable secure mode, with a toggle in the settings menu.
In 2007, Google fixed a cross-site scripting security issue that could let attackers collect information from Gmail contact lists.
In January 2010, Google began rolling out HTTPS as the default for all users.
In June 2012, a new security feature was introduced to protect users from state-sponsored attacks. A banner will appear at the top of the page that warns users of an unauthorized account compromise.
In March 2014, Google announced that an encrypted HTTPS connection will be used for the sending and receiving of all Gmail emails, and "every single email message you send or receive —100% of them —is encrypted while moving internally" through the company's systems.
Whenever possible, Gmail uses transport layer security (TLS) to automatically encrypt emails sent and received. On the web and on Android devices, users can check if a message is encrypted by checking if the message has a closed or open red padlock.
Gmail automatically scans all incoming and outgoing e-mails for viruses in email attachments. For security reasons, some file types, including executables, are not allowed to be sent in emails.
At the end of May 2017, Google announced that it had applied machine learning technology to identify emails with phishing and spam, having a 99.9% detection accuracy. The company also announced that Gmail would selectively delay some messages, approximately 0.05% of all, to perform more detailed analysis and aggregate details to improve its algorithms.
Third-party encryption in transit
In Google's Transparency Report under the Safer email section, it provides information on the percentage of emails encrypted in transit between Gmail and third-party email providers.
Gmail supports two-step verification, an optional additional measure for users to protect their accounts when logging in.
Once enabled, users are required to verify their identity using a second method after entering their username and password when logging in on a new device. Common methods include entering a code sent to a user's mobile phone through a text message, entering a code using the Google Authenticator smartphone app, or by inserting a physical security key into the computer's USB port.
Using a security key for two-step verification was made available as an option in October 2014.
If an algorithm detects what Google calls "abnormal usage that may indicate that your account has been compromised", the account can be automatically locked down for between one minute and 24 hours, depending on the type of activity detected. Listed reasons for a lock-down include:
"Receiving, deleting, or downloading large amounts of mail via POP or IMAP in a short period of time. If you're getting the error message, 'Lockdown in Sector 4,' you should be able to access Gmail again after waiting 24 hours."
"Sending a large number of undeliverable messages (messages that bounce back)."
"Using file-sharing or file-storage software, browser extensions, or third party software that automatically logs into your account."
"Leaving multiple instances of Gmail open."
"Browser-related issues. Please note that if you find your browser continually reloading while attempting to access your Inbox, it's probably a browser issue, and it may be necessary to clear your browser's cache and cookies."
Anti child pornography policy
Google combats child pornography through Gmail's servers in conjunction with the National Center for Missing & Exploited Children (NCMEC) to find children suffering abuse around the world. In collaboration with the NCMEC, Google creates a database of child pornography pictures. Each one of the images is given a unique numerical number known as a checksum
. Google then scans Gmail looking for the unique hashes. When suspicious images are located Google reports the incident to the appropriate national authorities.
The idea for Gmail was developed by Paul Buchheit
several years before it was announced to the public. The project was known by the code name Caribou
. During early development, the project was kept secret from most of Google's own engineers. This changed once the project became better and better, and by early 2004, almost everybody was using it to access the company's internal email system.
Gmail was announced to the public by Google on April 1, 2004 as a limited Beta test.
In November 2006, Google began offering a Java-based application of Gmail for mobile phones.
In October 2007, Google began a process of rewriting parts of the code that Gmail used, which would make the service faster and add new features, such as custom keyboard shortcuts and the ability to bookmark specific messages and email searches.
Gmail also added IMAP support in October 2007.
Gmail exited the beta status on July 7, 2009.
Prior to December 2013, users had to approve to see images in emails, which acted as a security measure. This changed in December 2013, when Google, citing improved image handling, enabled images to be visible without user approval. Images will be routed through Google's secure proxy servers rather than the original external host servers.
MarketingLand noted that the change to image handling means email marketers will no longer be able to track the recipient's IP address or information about what kind of device the recipient is using. However, Wired stated that the new change means senders can track the time when an email is first opened, as the initial loading of the images requires the system to make a "callback" to the original server.
In June 2012, Google announced that Gmail had 425 million active users globally.
In May 2015, Google announced that Gmail had 900 million active users, 75% of whom were using the service on mobile devices.
In February 2016, Google announced that Gmail had passed 1 billion active users.
In July 2017, Google announced that Gmail had passed 1.2billion active users.
In the business sector, Quartz reported in August 2014 that, among 150 companies checked in three major categories in the United States (Fortune 50 largest companies, mid-size tech and media companies, and Startup company from the last Y Combinator incubator class), only one Fortune 50 company used Gmail – Google itself – while 60% of mid-sized companies and 92% of startup companies were using Gmail.
In May 2014, Gmail became the first app on the Google Play Store to hit one billion installations on Android devices.
As part of G Suite, Google's business-focused offering, Gmail comes with additional features, including:
Email addresses with the customer’s domain name (@yourcompany.com)
99.9% guaranteed uptime with zero scheduled downtime for maintenance
Either 30 GB or unlimited storage shared with Google Drive, depending on the plan
24/7 phone and email support
Synchronization compatibility with Microsoft Outlook and other email providers
Support for add-ons that integrate third-party apps purchased from the G Suite Marketplace with Gmail
Gmail is noted by web developers for its early adoption of Ajax.
Gmail was ranked second in PC World
's "100 Best Products of 2005", behind Mozilla Firefox
. Gmail also won 'Honorable Mention' in the Bottom Line Design Awards 2005.
[ PCWorld.com — The 100 Best Products of 2005 , retrieved May 14, 2006] [ Bottom Line Design Awards Honorable Mentions. Retrieved February 14, 2007.]
In September 2006, Forbes
declared Gmail to be the best webmail
application for small businesses.
In November 2006, Gmail received PC World's 4 star rating.
Google claims that Gmail refrains from displaying ads next to potentially sensitive messages, such as those that mention race, religion, sexual orientation, health, or financial statements.
Automated scanning of email content
Google's mail servers automatically scan emails for multiple purposes, including to add context-sensitive advertisements next to emails, and to filter spam and malware.
In 2004, thirty-one privacy and civil liberties organizations wrote a letter calling upon Google to suspend its Gmail service until the privacy issues were adequately addressed. The letter also called upon Google to clarify its written information policies regarding data retention and data sharing among its business units. The organizations also voiced their concerns about Google's plan to scan the text of all incoming messages for the purposes of ad placement, noting that the scanning of confidential email for inserting third-party ad content violates the implicit trust of an email service provider.
On June 23, 2017, Google announced that, later in 2017, it will phase out the scanning of email content to generate contextual advertising, relying on personal data collected through other Google services instead. The company stated that this change was meant to clarify its practices and quell concerns among enterprise G Suite customers who felt an ambiguous distinction between the free consumer and paid professional variants, the latter being advertising-free.
In March 2011, a former Gmail user in Texas sued Google, claiming that its Gmail service violates users' privacy by scanning e-mail messages to serve relevant ads.
In July 2012, some California residents filed two class action lawsuits against Google and Yahoo!, claiming that they illegally intercept emails sent by individual non-Gmail or non-Yahoo! email users to Gmail and Yahoo! recipients without the senders' knowledge, consent or permission.
A motion filed by Google's attorneys in the case concedes that Gmail users have "no expectation of privacy".
A court filing uncovered by advocacy group Consumer Watchdog in August 2013 revealed that Google stated in a court filing that no "reasonable expectation" exists among Gmail users in regard to the assured confidentiality of their emails.
In response to a lawsuit filed in May 2013, Google explained:
"... all users of email must necessarily expect that their emails will be subject to automated processing ... Just as a sender of a letter to a business colleague cannot be surprised that the recipient's assistant opens the letter, people who use web-based email today cannot be surprised if their communications are processed by the recipient's ECS electronic provider in the course of delivery.
A Google spokesperson stated to the media on August 15, 2013 that the corporation takes the privacy and security concerns of Gmail users "very seriously."
April 2014 Terms of service update
Google updated its terms of service for Gmail in April 2014 to create full transparency for its users in regard to the scanning of email content. The relevant revision states: "Our automated systems analyse your content (including emails) to provide you personally relevant product features, such as customised search results, tailored advertising, and spam and malware detection. This analysis occurs as the content is sent, received, and when it is stored." A Google spokesperson explained that the corporation wishes for its policies "to be simple and easy for users to understand."
In response to the update, Jim Killock, executive director of the Open Rights Group, stated: "The really dangerous things that Google is doing are things like the information held in Analytics, cookies in advertising and the profiling that it is able to do on individual accounts".
Microsoft ad campaign against Google
In 2013, Microsoft launched an advertising campaign to attack Google for scanning email messages, arguing that most consumers are not aware that Google monitors their personal messages to deliver targeted ads. Microsoft claims that its email service Outlook does not scan the contents of messages and a Microsoft spokesperson called the issue of privacy "Google's kryptonite." In response, Google stated; "We work hard to make sure that ads are safe, unobtrusive and relevant ... No humans read your e-mail or Google Account information in order to show you advertisements or related information. An automated algorithm — similar to that used for features like Priority Inbox or spam filtering — determines which ads are shown.” The New York Times
cites "Google supporters", who say that "Microsoft’s ads are distasteful, the last resort of a company that has been unsuccessful at competing against Google on the more noble battleground of products".
Other privacy issues
2010 attack from China
In January 2010, Google detected a "highly sophisticated" cyber-attack on its infrastructure that originated from China. The targets of the attack were Chinese human rights activists, but Google discovered that accounts belonging to European, American and Chinese activists for human rights in China had been "routinely accessed by third parties". Additionally, Google stated that their investigation revealed that "at least" 20 other large companies from a "wide range of businesses" - including the Internet, finance, technology, media and chemical sectors – had been similarly targeted. Google was in the process of notifying those companies and it was also working with relevant US authorities. In light of the attacks, Google enhanced the security and architecture of its infrastructure, and advised individual users to install anti-virus and anti-spyware on their computers, update their operating systems and web browsers, and be cautious when clicking on Internet links or when sharing personal information in instant messages and emails.
Social network integration
The February 2010 launch of Google Buzz
, a former social network that was linked to Gmail, immediately drew criticism for publicly sharing details of users' contacts unless the default settings were changed.
A new Gmail feature was launched in January 2014, whereby users can email people with Google+ accounts even though they do not know the email address of the recipient. Marc Rotenberg, President of the Electronic Privacy Information Center, called the feature "troubling", and compared it to the Google Buzz initial launch privacy flaw.
In June 2016, Julia Angwin
Gmail suffered at least seven outages in 2009 alone, causing doubts about the reliability of its service.
It suffered a new outage on February 28, 2011, in which a bug caused Gmail accounts to be empty. Google stated in a blog post that "email was never lost" and restoration was in progress.
Another outage occurred on April 17, 2012,
September 24, 2013,
and January 24, 2014.
Google has stated that "Gmail remains more than 99.9% available to all users, and we're committed to keeping events like today's notable for their rarity."
"On behalf of" tag
In May 2009, Farhad Manjoo
wrote on The New York Times
blog about Gmail's "on behalf of" tag. Manjoo explained: "The problems is, when you try to send outbound mail from your Gmail universal inbox, Gmail adds a tag telling your recipients that you're actually using Gmail and not your office e-mail. If your recipient is using Microsoft Outlook, he'll see a message like, 'From firstname.lastname@example.org on behalf of email@example.com. Manjoo further wrote that "Google explains that it adds the tag in order to prevent your e-mail from being considered spam by your recipient; the theory is that if the e-mail is honest about its origins, it shouldn't arouse suspicion by spam checking software".
The following July, Google announced a new option that would remove the "On behalf of" tag, by sending the email from the server of the other email address instead of using Gmail's servers.
Comparison of mail servers
Comparison of webmail providers
List of Google products