Can one charger power a smartphone, tablet, and laptop?
Yes. If your devices support USB charging, you can use a working, compatible charger and the right cable for different gadgets. The charger does not have to carry the device maker's logo. A 100W or 140W charger will not automatically send its full power to a smartphone: with USB Power Delivery, the device requests a power mode it can accept. However, matching USB-C connectors do not guarantee that every device supports the same fast-charging mode.
In practice, there are three separate questions: is the connection safe, will charging start, and how fast will it be? For working devices that meet USB standards, differences in power and protocols usually affect the last two. A damaged cable, a faulty charger, or a device with a nonstandard implementation falls outside this rule.
Why people used to need a different charger for each device
In the days of Nokia, Siemens, Sony Ericsson, and early Samsung phones, manufacturers often used their own connectors and power supplies. It was hard or impossible even to plug one brand's charger into another brand's device. Round and rectangular power connectors are still common on laptops, and plugs that look alike do not always have the same electrical specifications.
USB changed that. It first gave many portable devices a common way to receive power, while USB-C and USB Power Delivery (PD) expanded the range of available power. A charger was no longer tied to just one device. The transition is gradual, though: some laptops still charge only through a proprietary connector, while others also support charging through USB-C. Check your laptop's documentation. Many recent Lenovo laptops, for example, offer this option.
What happens when you connect USB-C
USB-C describes the shape of the port and cable; it does not guarantee that a connected device supports USB PD. Basic 5V charging is possible over USB-C. For higher voltages, compatible devices negotiate through USB PD: the charger advertises its available modes, the smartphone or laptop selects one it can use, and the charger confirms it. Only then is that power mode established.
A 100W label therefore describes what the charger can supply under suitable conditions. A smartphone that needs less will request less. If the charger does not offer a profile the laptop needs, or the laptop does not accept power through that port, charging will not start.
USB PD also has additional modes, including PPS and AVS. These let a compatible device select a more precise voltage. Manufacturers may add their own fast-charging protocols. With a charger from another brand, the device may fall back to a lower-power protocol, so the fastest proprietary charging mode may be unavailable even when standard USB charging works.
What if the charger does not supply enough power?
Imagine using one charger for a smartphone, tablet, and laptop. A smartphone may need relatively little power, and the tablet may charge too, but a laptop in use can need much more. If the charger and laptop agree on a mode but its power is too low, the laptop may charge slowly, lose battery charge under heavy load, or warn that power is insufficient. Some combinations do not charge at all. For example, a laptop may need a 20V PD profile and reject a charger whose highest available voltage is 15V.
At the same time, Apple, for example, allows compatible USB PD chargers with different power ratings for Mac laptops, but recommends a charger that meets at least the stated minimum for optimal performance.
If a charger has several ports, check the maximum output of each port and how power is shared when other devices are connected, for example in 50/50 or 70/30 proportions.
Why the cable matters too
A USB-C - USB-C cable is more than a wire with matching plugs. At 20V, a typical cable rated for up to 3A is limited to 60W. To deliver more than 3A, the power source must recognize the cable's capabilities. A 20V5A mode, or 100W, requires an electronically marked 5A cable. The extended USB PD 3.1 modes up to 240W require a suitable EPR cable. USB-IF explains the differences between cable labels.
A 240W label on a cable does not make every charger or laptop a 240W device. The final mode is limited by every part of the chain: the charger's output, the cable's capabilities, and the device's request. If you replace the required cable with one rated for 60W, the system should limit itself to an available mode.
The 16-inch MacBook Pro is a good example. Apple states that models from November 2023 can fast-charge from a 140W charger through a 240W USB-C cable. For 2021 models, its fast-charging instructions specify a USB-C - MagSafe 3 cable. Even within one product line, screen size or charger wattage alone is not enough to choose a cable.
What the EU rules changed
The EU's common charging solution has accelerated the move to USB-C and compatible fast charging for the device categories it covers. According to the European Commission, the rules took effect for smartphones, tablets, and several other devices on December 28, 2024, and for laptops on April 28, 2026. They do not apply to every battery-powered household device, and they do not mean every USB-C port can charge a laptop.
There is also an important correction to a common account of the law: the EU did not ban chargers from the box. Buyers of covered devices must have the option to buy one without an external charger. Manufacturers can also offer a bundle with a charger. The aim is to avoid buying an extra power supply when a compatible one is already at home.
How to choose one charger for several devices
Start with the device that needs the most power. Check whether your laptop accepts charging through the specific USB-C port and what power rating its manufacturer recommends. For the smartphone and tablet, find out whether PPS or a proprietary protocol is needed for the fastest charging.
If you plan to charge a laptop, the charger's build quality matters more because it must handle a sustained load. Consider chargers that have been tested and shown to work steadily at their maximum load.
If you want to charge several devices at once, choose a multiport charger with spare capacity and a convenient reset-free feature that keeps power flowing to connected devices when another device is plugged in or removed (the catalog marks this feature).
Then choose a cable for the highest mode you expect to use. For charging up to 60W, a 3A USB-C - USB-C cable is enough. For 100W or more, I recommend a 240W cable: it usually costs little more than a 100W version and should not need replacing when you get a new device.
Keep in mind that a USB-A - USB-C cable with an adapter cannot deliver power under the PD standard: a USB-A port has no physical CC pin. There is, however, a proprietary Xiaomi solution that works only with Xiaomi's USB-A - USB-C cable and charger.
The essentials
You can use one quality USB charger for a smartphone, tablet, and laptop, and even charge them at the same time if it has enough power and the charger and cable support the required modes. A matching brand is not required. Different protocols more often limit charging speed than prevent charging altogether.
