Adobe Acrobat online

What it does

Compress, convert, merge, split, sign and fill using the same engine as desktop Acrobat, which shows most clearly in PDF-to-Word conversion — the layout survives where cheaper converters return a wall of floating text boxes. It is the safest choice when a converted document has to look identical to the original. Adobe's account wall arrives quickly and cannot be argued with.

Best for

• PDF to Word where formatting matters
• Documents that must convert faithfully

Where it stops