A great service but be aware of automatic subscription after use.
When I had needed to use zoomconvert to change a jpeg file to pdf I paid .90p, I hadn't realised I would be charged £39.99 seven days later for subscription. I had a panic when checked the balance on my credit card statement. I immediately sent zoomconvert a message with regard to this on their support form, the following morning I had received a message back to confirm a full refund would be issued. Excellent service! I gave only 3 stars due to the automatic sign up process, not the convert service which had been a must at the time.