Creating Custom Streaming Overlays and Thumbnails: Image Sizes and Formats Explained

Whether you're streaming on Twitch, YouTube, or Kick, your visual branding makes a huge difference. Professional-looking overlays, panels, and thumbnails help you stand out in a sea of streamers. But getting the image sizes right — and keeping file sizes manageable — is surprisingly tricky. Here's everything you need to know.

Twitch Image Sizes

Profile picture: 256x256 pixels minimum, displayed at 150x150. Use PNG for sharp edges on logos, JPEG for photos. Max file size 10 MB. Offline banner: 1920x1080 pixels — this displays when your stream is offline. JPEG at quality 85 keeps it under 1 MB. Panels: 320 pixels wide, flexible height (most streamers use 100-300px tall). PNG is standard since panels often have transparent backgrounds or text. Stream overlay: 1920x1080 PNG with transparency. Keep the total overlay file size reasonable — very large overlays can increase OBS/Streamlabs CPU usage. Emotes: Required in 3 sizes: 28x28, 56x56, and 112x112 pixels. PNG with transparency. Max 25 KB each.

YouTube Image Sizes

Thumbnails: 1280x720 pixels (16:9 aspect ratio). This is critical — thumbnails drive click-through rates more than almost any other factor. Use JPEG at quality 90 for photographs, PNG for graphics-heavy designs with text. Max file size 2 MB. Channel banner: 2560x1440 pixels is the full size, but the safe area (visible on all devices) is 1546x423 pixels in the center. Profile picture: 800x800 pixels, displayed as a circle. Keep important content away from the edges.

Kick Image Sizes

Profile picture: 300x300 pixels minimum. Offline banner: 1920x1080. Panels: Similar to Twitch at 320px wide. Overlays: 1920x1080 PNG with transparency.

Designing Effective Thumbnails

YouTube thumbnails are arguably the most important images a content creator makes. They need to be readable at tiny sizes (the mobile feed shows them at roughly 160x90 pixels) while still looking good at full size. Best practices include: use large, bold text (no more than 5-6 words), high contrast colors, expressive facial reactions if applicable, a clear focal point, and avoid small details that vanish at thumbnail size.

For gaming thumbnails specifically: a screenshot from the game + large text indicating the topic + your face or logo is the proven formula. Use the cropper to frame the game screenshot, the resizer to hit exactly 1280x720, and the compressor to keep it under YouTube's 2 MB limit.

Overlay Design Tips

Your stream overlay needs to frame the gameplay without covering important UI elements. Before designing, take a screenshot of the game you stream most and use it as a reference layer. Common overlay elements include: webcam frame (usually bottom-left, 320x240 or 480x360), recent events panel (followers, subs, donations), chat box frame, game-specific overlays (health bars, minimaps — make sure your overlay doesn't overlap these).

Save overlays as PNG with transparency. Use our image converter if you need to convert between formats, and the compressor to optimize the final files. Smaller overlay files mean less CPU overhead in OBS.

Format Recommendations Summary

Thumbnails: JPEG quality 90 for photograph-based, PNG for graphic-heavy designs. Overlays: always PNG (transparency required). Panels: PNG (clean text and transparency). Profile pictures: PNG for logos, JPEG for photos. Emotes and badges: always PNG with transparency. Offline banners: JPEG quality 85 is usually sufficient.

All of these images can be processed with ToolPix's free image tools — resize to exact dimensions, compress to meet file size limits, and convert between formats. Everything runs in your browser, so your designs stay private.