How to Resize a GIF for Discord, Slack, and Twitter (Exact Sizes)

Every platform has different rules for GIF uploads. Upload the wrong size and your GIF gets rejected, distorted, or shows as a broken thumbnail.

This guide gives you the exact dimensions and file size limits for each major platform, plus how to resize your GIF in minutes.

---

GIF Size Requirements by Platform

Platform	Use Case	Max Size	Dimensions
Discord	Custom Emoji	256KB	128×128px
Discord	Sticker	512KB	320×320px
Discord	Message GIF	8MB (free) / 50MB (Nitro)	Any
Slack	Custom Emoji	128KB	128×128px (recommended)
Twitter/X	Tweet GIF	15MB	Up to 1280×1080px
Instagram	Story	30MB	1080×1920px (9:16)
WhatsApp	Message	~500KB recommended	Any
Email (Gmail)	Inline GIF	25MB total email	Any
Tenor / GIPHY	Upload	100MB	Any

---

How to Resize a GIF

Use the Moxion GIF Resizer — free, no account required.

Steps:

1. Go to moxion.ai/gif-resizer
2. Upload your GIF
3. Enter your target width and height (or select a preset)
4. Click Resize
5. Download the resized GIF

---

Discord GIF Sizes

Custom Emoji (128×128px, under 256KB)

Discord custom emoji have strict limits. Your GIF must be:

• 128×128 pixels (square format required)
• Under 256KB file size

If your GIF is larger, you need to both resize it and compress it.

Steps for Discord emoji:

1. Resize to 128×128px using GIF Resizer
2. If over 256KB, compress using GIF Compressor
3. Go to Discord Server Settings → Emoji → Upload Emoji
4. Upload the resized GIF

Stickers (320×320px, under 512KB)

Discord stickers are larger than emoji:

• 320×320 pixels (square format required)
• Under 512KB file size
• Must be PNG or GIF format (not APNG)

---

Slack GIF Sizes

Custom Emoji (128×128px, under 128KB)

Slack's emoji size limit is stricter than Discord:

• 128×128 pixels recommended (any size works but gets scaled)
• Under 128KB file size (very strict)

For a GIF at 128×128px to stay under 128KB, you typically need:

• 15fps or lower
• 2–3 seconds maximum duration
• Reduced color palette (64–128 colors instead of 256)

How to compress aggressively for Slack:

1. Resize to 128×128px
2. Use GIF Compressor and set target size to under 128KB
3. Upload to Slack: Workspace Settings → Customize → Emoji → Add Emoji

---

Twitter/X GIF Sizes

Twitter is the most permissive platform for GIFs:

• Maximum 15MB file size
• Maximum 1280×1080px resolution
• GIFs over 15MB are automatically converted to MP4 by Twitter

For best performance, keep your Twitter GIF:

• Under 5MB for fast loading
• 720p or lower for mobile viewers
• 4 seconds or shorter for highest engagement

---

Instagram GIF Sizes

Instagram doesn't support GIF format natively in feed posts. Here's what works:

Instagram Stories: Upload GIF as a video (convert to MP4 first)

• 1080×1920px (9:16 vertical)
• Under 30MB
• Convert GIF to MP4 using GIF to MP4

Instagram DMs: GIFs can be shared via the GIF search (GIPHY integration) or as video files.

---

WhatsApp GIF Sizes

WhatsApp treats GIFs as videos internally:

• Any resolution is accepted
• Keep under 500KB for fast delivery on mobile data
• Under 16MB is the hard limit

For WhatsApp, prioritize compression over resolution. A 480p GIF under 500KB loads instantly.

---

FAQ

Q: Why is my GIF blurry after resizing?
A: Upscaling (making a GIF larger than its original size) always causes blur because there's no new pixel data to fill in. Only downscale GIFs — don't resize them larger than their original dimensions.

Q: How do I resize a GIF without losing quality?
A: Quality loss is proportional to how much you resize. A 50% reduction (e.g., 800px to 400px) maintains good quality. Reducing to 25% of original size will show visible softness. Use high-quality source GIFs for the best results.

Q: Why does Discord say my GIF is too large even after resizing?
A: The pixel dimensions might be correct but the file size is still over the limit. After resizing, also run the GIF through the GIF Compressor to reduce file size.

Q: Can I resize a GIF on my phone?
A: Yes — the Moxion GIF Resizer works in mobile browsers. Open moxion.ai/gif-resizer on any iPhone or Android browser.

Q: What's the difference between resizing and compressing a GIF?
A: Resizing changes the pixel dimensions (width × height). Compressing reduces file size without changing dimensions, by reducing colors, framerate, or dithering. Both affect quality differently.