Every Discord image size
Discord uses six images that people regularly get wrong. Four are small images in the sidebar, member list and chat, and two are large banners and backgrounds. The sizes below are the ones this tool crops to, the same values listed in the tool above.
All six are center-cropped: the tool scales your image until it fills the size, then trims the edges evenly. If the important part of your picture is near an edge, crop it yourself first so it sits closer to the middle.
Profile picture
128 × 128 px, 1:1 Your avatar. Shown as a circle, very small in chat.
Server icon
512 × 512 px, 1:1 Shown as a circle in the server list.
Profile banner
600 × 240 px, 5:2 The strip at the top of your profile card. Requires Nitro.
Server banner
960 × 540 px, 16:9 Shown above the channel list. Requires server boost level 2.
Server invite background
1920 × 1080 px, 16:9 Shown behind your invite link. Requires server boost level 1.
Emoji
128 × 128 px, 1:1 Custom server emoji. Square, shown at text size.
Making a Discord banner that survives the crop
The two banners are the images people search for most, and they behave differently. The server banner is 16:9, so a normal landscape photo or a presentation slide fits it with little loss. The profile banner is 5:2, two and a half times wider than it is tall, so a landscape photo loses a large band at the top and bottom.
On the profile banner, your profile picture overlaps the lower left of the strip. Keep text and faces in the upper middle and right of the banner, or they end up hidden behind your avatar.
Start from an image at least as large as the size you need. Discord shows banners on large desktop screens, and an image stretched up from a smaller original looks soft there. The tool flags any size that is larger than your upload.
Pfp, server icon and emoji: small images, different rules
The pfp, the server icon and custom emoji are all square, and all are shown small. Detail that looks good at full size disappears in a busy chat, so a close crop of a face, a bold logo or a single symbol works better than a wide scene.
The pfp and server icon are shown as circles. The tool exports the full square, and Discord cuts the corners when it displays it. Emoji are shown as squares at text size, so a transparent background makes them sit cleanly next to words: start from a PNG with transparency and the tool keeps it.