The proportion of people who think charities work professionally has increased by more than a sixth over the past three years, according to a survey.
The poll by the consultancy nfpSynergy shows that the proportion of people who agree that "charities strive to achieve the highest professional standards at all times" rose from 47 per cent in 2007 to 55 per cent in 2010.
The consultancy regularly surveys a representative sample of 1,000 people aged 16 and over in Britain about their perceptions of charities for its Charity Awareness Monitor.
In the latest sample, the number of people who disagreed with the statement that charities strive to achieve the highest professional standards dropped to 12 per cent from 15 per cent in 2007.
The survey also found that some of the most cited reasons people gave for being put off donating to a particular charity were fundraisers being too persistent (50 per cent), fundraising methods being too obtrusive (49 per cent) and bad publicity about the charity (41 per cent).
Only 12 per cent of respondents said that not being contacted or updated after making a donation would put them off giving to a particular charity.
Joe Saxton, co-founder of nfpSynergy, said: "The charity sector can be cheered by the fact that more a supporters seem to think charities always strive to achieve the highest professional standards.
"That said, this new data also suggests that charities need to make sure fundraising is as effective as possible while being as unobtrusive as possible – not always an easy circle to square."