By Christopher Bjork 

MADRID--Fast-fashion group Inditex SA has turned in better-than-expected sales and profit for the first quarter even though unfavorable exchanges rates helped drag the Spanish retailer's net profit 7.3% lower than in the same period last year.

Inditex, best known for its Zara clothing chain, said net profit fell to EUR408 million ($552 million) from EUR438 million a year earlier on a 4.3% rise in revenue to EUR3.75 billion. Weaker currencies outside the euro zone, where the owner of the Zara chain sells more than half its clothes, squeezed sales growth and its profit margins.

But the company, the largest fashion maker in the world by sales, did better than analysts had expected as it controlled costs and benefited from strong underlying growth at Zara.

Stripping out the effect of currency depreciation, Inditex said its sales in stores and online grew 11% in the first quarter, a trend that it said continued during the first five weeks of the second quarter.

"We are satisfied with this result as it means the group has achieved a strong operating performance and a strong like-for-like sales growth," said Marcos López, Inditex's director of capital markets.

Sales growth at Inditex's main European rival Hennes & Mauritz AB underscored robust global demand for consumer goods. The Swedish group said on Wednesday that its revenue grew 16% in the three months to end-May from the same quarter a year ago.

Shares in the two companies were among Europe's top three blue-chip gainers in early trading Wednesday, with H&M's shares up 2.4% and Inditex's stock up 1.7%.

"We expect the market to react positively to today's earnings announcement as Inditex continues to deliver strong operational performance and as investors look ahead to a lower impact from currencies in the quarters to come," said Jamie Merriman, an analyst at Bernstein Research.

Inditex's revenue grew faster than H&M in the same period last year, making the latest growth rates tricky to compare, said Anne Critchlow, an analyst at Société Générale.

Large retailers selling everything from deodorant to sunglasses are seeing big revenue swings due to exchange rate volatility in emerging markets. Unilever PLC said in April it would raise prices in emerging markets in an attempt to offset a decline in revenue due to currency shifts. Luxottica Group SpA, maker of the Ray-Ban and Oakley glasses, also blamed weaker currencies for a drop in sales.

Inditex, which has more than 6,300 stores in 87 countries, has proved to be no exception. In Russia, Inditex's third-largest market outside the euro zone, the ruble is down more than 15% this year against the euro, according to Bernstein Research. In Turkey, another big market for the apparel maker, the lira has fallen more than 20% against the euro.

Inditex also Wednesday said that it will open a virtual storefront at Alibaba Group Holding Ltd's Tmall online shopping site for the autumn-winter season this year, the first time the company is using a third-party site to sell Zara clothes.

Tmall, a fast-growing shopping site, has had success recently signing up western brands keen to reach Chinese middle-and upper-class consumers which are buying an increasing share of their clothes online. U.K. luxury clothier Burberry PLC opened a store there in April this year. Inditex already markets several of its brands online in China though its own websites,

Inditex also said it would propose a share split to shareholders, with each existing share exchanged for five new ones to increase their liquidity on the Madrid stock exchange.

Write to Christopher Bjork at christopher.bjork@wsj.com

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