Powers:

Galactus possesses cosmic power beyond most forms of measurement (The Power Cosmic). He can levitate; restructure molecules; convert matter into energy and vice-versa; project energy with enormous concussive force; teleport himself, others, and objects across space, dimensions, and time; erect virtually impenetrable fields; restore others from any injury, even total disintegration; and endow or enhance powers within others. Even his heralds, imbued with the smallest fraction of his power, can manipulate matter and energy far beyond human comprehension. Though he generally avoids physical conflict, Galactus can bolster his own strength beyond any known system of measure. Galactus is telepathic, able to scan the thoughts of virtually any known being.
To sustain his immense power, Galactus requires energies derived from a biosphere, a planet able to sustain living beings, though life does not actually have to be present. Though Galactus can extract and absorb this energy himself, he generally employs his immense Elemental Converter to perform the process, as it is far more efficient and avoids the expenditure required of him. Sometimes the planets on which he feeds are left barely habitable; other times he consumes all life and water, leaving it devastated and barren; most often the process reduces the planet to space rubble. When Galactus was newly formed, the energy of a medium-size Earth-like planet sustained him for over a century. Now he needs to feed about once a month; in addition, when preparing for a massive expenditure of energy, he may absorb planets more frequently to amplify his power stores. Conversely, when he does not feed within his allotted time, his energies will dwindle, and he will even begin to physically shrink as they drop dangerously low. His body totally converts the energies he absorbs for his life functions and activities without any waste products.

Though seemingly destroyed on several occasions, Galactus is always restored to full power eventually. In addition, despite being a physical being, Galactus can adopt a manifestation (M-Body) from the Dimension of Manifestations in order to commune with abstract beings, such as Death and Eternity.

Abilities
Galactus has scientific knowledge beyond human understanding.

Paraphernalia
Galactus has large stores of powerful and advanced technology, including Taa II (once destroyed, later rebuilt), his Elemental Converter, the Ultimate Nullifier, and a spherical starship for transport. He commonly uses a series of Punishers to fight on his behalf against lesser beings. Though under 5 feet tall, these are immensely strong, durable, and fast, and they can auto-repair and adapt to counter threats.