What are you shredding? Any shredder can handle basic office paper, but if you want to dispose of tougher stuff -- unopened junk mail envelopes, multi-page documents fastened with staples or paper clips, old credit cards, data backup discs, etc. -- then you'll need a heavy-duty paper shredder that can handle these items. If you have large items to shred, such as folders, look for a paper shredder with a wide feed slot. If you plan to shred credit cards or data discs, separate slots for these items are a handy feature.
How much do you have to shred? Look for a shredder that can handle the volume of material you have to process. Personal paper shredders for home or small-office use usually say they can take anywhere from 6 to 24 sheets at a time, though reviewers warn that these estimates are often exaggerated and real-world rates are sometimes as little as half of what's claimed. Bin capacity is important as well; the more you shred, the faster your bin fills up, so if you're putting a lot of paper through the shredder, look for one with a capacity of 5 gallons or more.
Do you shred in large or small batches? If you prefer to save all your paper to be shredded in a big batch, the shredder's continuous run time is important. That's the number of minutes a paper shredder can work at a stretch before it has to be shut down to cool off. With most shredders, you can feed through about 100 batches of material in five minutes of continuous shredding, and the size of each batch, of course, depends on the feeder capacity in sheets. Once you hit the shredder's limit, you'll need to let it cool down for a varying period of time; most require 20 to 30 minutes before you can start them back up without causing damage, but some take as long as 90 minutes to cool off.
How crucial is security? While a crosscut shredder provides more security than a strip shredder, it may not be secure enough for organizations that have to dispose of highly sensitive documents. If you're concerned about expert spies rather than just garden-variety thieves, look for a micro-cut shredder, which turns documents into tiny diamond-shaped fragments.
Some articles about identity theft warn that it's important to shred any document that contains "personal information," including your name and address -- which includes every single piece of mail that comes into your house. However, according to the paper shredder buying guide at ConsumerReports.org (which is free to read, even by non-subscribers), you don't actually have to be that extreme. In most cases, your name and address are public information that's easy to find elsewhere, so there's no need to shred personal mail, catalogues, or junk mail addressed to "resident." However, all documents that contain your Social Security number or account numbers -- bank statements, monthly bills, explanations of benefits for your medical insurance and the like -- are possible fodder for identity thieves and should be shredded. Shred any documents with still-valid passwords or PINs on them, as well. One thing you should not shred is your tax forms and documents from the past seven years; keep those on file in case of an audit.