Presidential contenders are gearing up for their last major rallies on Saturday to fire up their bases and sway undecided voters, as campaigning draws to a close ahead of the election next week.

Candidates will enter a cooling off period on Sunday until the big day on Feb. 14, where three contestants are in the running to succeed the hugely popular President Joko "Jokowi" Widodo, who has led Indonesia for a decade and cannot run again. 

The election is between two popular former governors, Ganjar Pranowo and Anies Baswedan, and ex-special forces commander Prabowo Subianto, who has soared in opinion polls with the tacit backing of the president, and the incumbent's son as his running mate. 

At stake is the leadership for the next five years of a mineral-rich G20 economy of 270 million people positioning itself as a future destination for multinational firms in downstream industries. 

More than 20,000 legislative and administrative posts will also be decided next week, contested by 259,000 candidates.

The biggest party's Ganjar will be seeking to shore up his support in Central Java, which he served for two decades as a governor and lawmaker, while Anies, an independent candidate who was governor of the capital from 2017-2022, will hold his rally at the city's biggest stadium. 

Defence Minister Prabowo is contesting his third successive election and holds his rally at another stadium in Jakarta, hoping to convert his big social media following among youngIndonesians into votes. More than half of Indonesia's 204.8 million electorate is under 40. 

Prabowo was given a boost on Friday when the latest opinion poll by Indikator Politik Indonesia projected him scoring a majority, with 51.8 percent support among the 1,200 people surveyed. 

A run-off will be held in June if no candidate gets more than 50 percent of votes. 

Anies was the preferred candidate of 24.1 percent of respondents, while 19.6 percent opted for Ganjar, with about 4.5 percent undecided. 

Undecided voters could be critical to former academic Anies and the populist Ganjar to force a second round between the top two finishers, a scenario that could significantly change the dynamic of the presidential race. 

Arya Fernandes of Indonesia's Centre for Strategic and International Studies said a good turnout was vital if Prabowo aims to win outright next week. 

"It depends on whether Prabowo can ensure that his loyalists show up to the polls," he said. 

Prabowo has undergone a rebrand to try to shed his reputation as a hot-tempered nationalist and feared lieutenant of the late strongman ruler Suharto, now cultivating a more gentle image as a cat-loving grandfather with clumsy dancing. 

But Arya believes his rise in popularity is about him riding on the implied support of the president, whose allies say regards former rival Prabowo as the continuity candidate.

Prabowo is accused of rights abuses while serving as a military chief during Indonesia's dying days of the Suharto dictatorship a generation ago.

Analysts say his vast wealth, nationalist verve in populist speeches and strongman credentials as chief of the influential military have all contributed to his lead.

He has also cultivated a "cute grandpa" image on social media, in a bid to win over young voters.

The election has already been mired in controversy after Jokowi's brother-in-law issued a ruling last year lowering the age for candidates, allowing the president's son to run for vice president.

Gibran Rakabuming Raka, the 36-year-old mayor of Surakarta city, became Prabowo's running mate in a boost for his election.

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