Yes. Jumping spiders can bite. They have chelicerae (fangs) and venom, because that's how they kill their prey. But the question people are really asking is "are jumping spiders dangerous to me?" and the answer to that is no, not meaningfully.
How often do they bite?
Rarely. Jumping spiders are not aggressive towards humans. They don't see us as food (we're too large by several orders of magnitude), and their default response to a perceived threat is to run away or jump. Biting is a last resort, usually triggered by the spider being physically trapped or squeezed against skin.
In years of keeping and handling jumping spiders, I've been bitten twice. Both times I accidentally pinched the spider while closing an enclosure lid. It wasn't a defensive display or an unprovoked attack. I squished the animal and it responded the only way it could.
Experienced keepers who handle their spiders regularly report bites as extremely uncommon events. If you're handling gently, letting the spider walk onto your hand voluntarily, and not trapping or cornering it, a bite is very unlikely.
What does a bite feel like?
A small pinprick. That's genuinely it for most people. The chelicerae of a Phidippus regius, the largest commonly kept species, are big enough that you'll feel the bite, but it's comparable to a mild insect sting. Much less painful than a bee sting or a wasp sting.
You might see a small red mark at the bite site that fades within hours to a day. Some people report very mild, localised swelling. That's a normal inflammatory response, not a sign of dangerous envenomation.
Is the venom dangerous?
No. Jumping spider venom works on insects and other small invertebrates. It's not medically significant to humans. There are no recorded cases of serious systemic reactions to jumping spider bites in healthy adults. No hospitalisations, no fatalities, nothing in the medical literature suggesting they're a health risk.
A caveat: if you're allergic to insect or arachnid venoms generally, any bite carries a theoretical risk of an allergic reaction. If you know you have a venom allergy, exercise caution with any arthropod. But for the vast majority of people, a jumping spider bite is a non-event.
It's worth being precise about terminology here. Jumping spiders are venomous (they inject venom through their chelicerae), not poisonous (which would mean they're harmful to eat or touch). The distinction matters in biology, even if casual conversation treats the words as interchangeable.
Will they bite my children?
Children get bitten in the same circumstances adults do: when the spider is trapped or squeezed. Kids with less fine motor control are slightly more likely to accidentally pinch a spider during handling. Supervise young children during handling sessions and teach them the "open palm" technique (let the spider walk onto a flat hand rather than trying to pick it up between fingers).
If a child does get bitten, wash the site with soap and water. There's no need for medical attention unless you see signs of an allergic reaction (widespread swelling, difficulty breathing, hives), which would be extraordinarily unusual.
Bite prevention
These are common sense, but worth stating:
- Let the spider walk onto your hand. Don't grab or chase it.
- Don't trap the spider against your skin or between your fingers.
- If the spider raises its front legs in a threat posture, back off. It's telling you to leave it alone.
- Don't handle during or just after a moult, when they're more stressed and vulnerable.
- Handle over a soft, low surface so neither of you panics about a fall.
What about other spider species?
Context matters. Jumping spiders (family Salticidae) are among the least dangerous spiders you can encounter. They're not tarantulas, and they're nowhere near the territory of species with medically significant bites like Latrodectus (widows) or Loxosceles (recluses), neither of which are native to the UK.
Tarantulas kept as pets can deliver a more painful bite, and some Old World species have medically notable venom. Jumping spiders are in a completely different category. If spiders make you nervous but you still want to try keeping one, a jumping spider is about the lowest-risk entry point there is.
The other thing tarantulas have that jumpers don't is urticating hairs. Some tarantula species flick barbed abdominal hairs as a defence mechanism, which can irritate skin and eyes. Jumping spiders don't have urticating hairs. Their defence strategy is overwhelmingly "run away and hope for the best."