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The dollar firmed on Friday and was on track for its best performance in seven years, buoyed by the Federal Reserve's aggressive monetary policy tightening and concerns about the global growth outlook.

The U.S. dollar index, which measures the greenback against a basket of currencies, has surged more than 8% this year, the most since 2015. It was last firm at 103.99.

The Fed has raised rates by a total of 425 basis points since March to curb surging inflation, a move that has kept the dollar in bid for most of the year.

But expectations that the central bank may not have to raise rates as high as previously feared have caused the greenback to unwind its towering rally. The U.S. dollar index has fallen over 7% this quarter.

"I expect the king dollar to lose its crown and the dollar to make a more decisive turn by the middle of next year," Bank of Singapore currency strategist Moh Siong Sim said.

Conversely, an ultra-dovish Bank of Japan in the face of a hawkish Fed, has spelled pain for the Japanese yen. It has fallen more than 13% year to date, its worst performance since 2013.

But last week's surprise tweak to the BOJ's bond yield control have investors betting that the central bank may soon fully abandon its controversial policy, sparking a rebound in the fragile currency.

The yen was last 0.4% higher at 132.47 per dollar.

"The question is whether there's more to come," Sim said. "But I think the fundamental backdrop for Japan is starting to turn in favour of the yen."

The euro slipped 0.04% to $1.0656, and is on track for a more than 6% fall this year, pressured by a combination of weak eurozone growth, the war in Ukraine and the Fed's hawkishness.

The single currency had dipped below parity against the dollar earlier this year for the first time in almost two decades.

Sterling edged 0.01% lower to $1.2053, looking set to cap a tumultuous year embroiled in political drama with a nearly 11% decline, the worst since 2016.

Policymakers from the European Central Bank and the Bank of England have signalled more rate hikes to come next year, in a bid to tame inflation even at the risk of hurting their economies.

"The ECB and BoE forced to tighten policy more aggressively amid stubborn cost-shocks, is almost certain to tip Europe into a fairly deep recession," said Vishnu Varathan, head of economics and strategy at Mizuho Bank.

Elsewhere, the Aussie was headed for a nearly 7% annual slump, and last rose 0.02% to $0.6778.

The kiwi, which has fallen more than 7% year to date, the worst since 2015, slipped 0.31% to $0.6330.

Both currencies, often used as liquid proxies for the Chinese yuan, will likely take leads from how China's reopening plays out.

China's U-turn of its rigid "zero-COVID" policy this month has left its healthcare system scrambling to cope with a wave of infections, and countries imposing curbs on travellers from China.

The offshore yuan, which last bought 6.9701 per dollar, was headed for a nearly 9% yearly decline, its worst annual performance since such data first became available in 2011, as China continues to reel from the effects of its stringent COVID restrictions.

"Into 2023, the immediate focus will be on growth. On one hand, global growth is slowing ... but on the other, China's reopening brings hopes," said Christopher Wong, a currency strategist at OCBC.

"The issue is whether the rapid reopening (in China) triggers fresh waves in some countries or regions, and that may lead to fresh restrictions. This would undermine sentiment in the near term."