Compress Images for Discord, Email & Social — Platform Size Limits Guide

Platform Image Size Limits — Quick Reference

Platform	Max File Size	Recommended Dimensions	Best Format
Discord (chat)	25MB (50MB Nitro)	1920x1080 or smaller	JPG or PNG
Discord (emoji)	256KB	128x128 exactly	PNG (supports transparency)
Discord (sticker)	512KB	320x320	PNG or APNG
Discord (server icon)	10.24MB	512x512 min	PNG or JPG
Gmail	25MB (all attachments)	Any	JPG for photos, PNG for screenshots
Outlook	20MB (all attachments)	Any	JPG for photos, PNG for screenshots
Slack (free)	No limit per file	Any	JPG or PNG
WhatsApp	16MB (documents)	Any	JPG auto-compressed
Reddit	20MB	Any	JPG or PNG
LinkedIn post	5MB	1200x627 recommended	JPG or PNG
Twitter/X	5MB (photos), 15MB (GIF)	1600x900 optimal	JPG or PNG

Discord-Specific Workflow

For chat images:

1. Check current size — right-click the file, check properties/info
2. If under 25MB, upload directly — Discord handles display
3. If over 25MB: open Compress Image, compress to ~75% quality, download

For Discord emojis:

1. Resize to exactly 128x128 pixels
2. Compress to under 256KB
3. Use PNG format if you need transparency

Email-Specific Workflow

Email attachment limits count ALL attachments combined — not per file. If you are sending 5 photos:

• Gmail: 5 photos × 5MB max each = 25MB total limit
• Outlook: 5 photos × 4MB max each = 20MB total limit

Fastest approach: Resize each photo to 1920px wide (good for viewing on any screen), then compress at 75% quality. This typically gets each photo to 200-500KB — well under limits.

Two-Tool Combo: Resize + Compress

For maximum size reduction, use both tools in sequence:

1. Resize — reduce dimensions to what the platform actually needs. A 4000x3000 photo does not need to be that large for Discord chat or email
2. Compress — reduce file size at the new dimensions

Example: A 12MB photo (4000x3000) → resize to 1920x1440 (→ 3MB) → compress at 80% (→ 600KB). That is a 95% reduction with no visible quality loss on screen.

Format Tips

• JPG: Best for photos. Smallest file size. No transparency support
• PNG: Best for screenshots, text, logos, and anything needing transparency. Larger files
• WebP: Best of both worlds (small size + transparency). Supported by Discord, most browsers, but not all email clients