Discord shows different preview sizes for embeds, pasted links, uploaded attachments, and Quest tiles — each with its own canvas, render behaviour, and file-size cap. This tool returns the exact dimensions and limits for each so your thumbnails look sharp instead of letterboxed or down-rezzed.
How it works
Discord scales large media down to fit the chat column, so the goal is to design at the native resolution and keep the subject centred. The tool maps each preview surface to its recommended canvas:
Rich embed image = 1280 × 720 (16:9, scaled to ~400 px wide)
Embed thumbnail = 256 × 256 (1:1, ~80 px corner square)
Link preview og:image = 1200 × 630 (1.91:1, link-card unfurl)
Image attachment = 1920 × 1080 (16:9, click to expand)
Quest tile = 1280 × 720 (16:9, Quests panel card)It also lists the file-size limits, which differ by tier for attachments — 10 MB free, 50 MB Nitro Basic, and 500 MB full Nitro — and recommends keeping link preview images small so the card unfurls quickly.
Tips and notes
Export embeds and attachments at 16:9 to avoid letterboxing inside Discord’s preview card, and set the og:image meta tag on any page you want to unfurl cleanly. Because the corner embed thumbnail renders at roughly 80 pixels, put a single clear focal point dead centre. Use PNG for graphics and transparency, JPG for photos to keep size down, and confirm your attachment fits the upload limit for your account tier before posting.