By
The rise in consumer prices was lower than the 6.65 percent seen in March, the statistics agency said.
Prices fell 0.31 percent month-on-month, after falling 0.32 percent in March.
Annualised core inflation, which excludes volatile food prices, accelerated to 4.62 percent in April from 4.45 percent in March, suggesting that the central bank may raise interest rates later this year.
The figures come after Bank Indonesia in April held interest rates at 6.75 percent after prices eased slightly a month earlier, but the central bank warned the risk of inflationary pressures remained high.
-- Dow Jones Newswires contributed to this story --