Does my image actually stay on my device?

Yes. The resize runs in your browser using the Canvas API. We never see, store, or transmit your image. You can verify this in your browser's network tab — only static files load, no upload requests.

What's the catch? Why is this free?

No catch. The whole tool runs in your browser, so there are no servers and no bandwidth costs. We're validating demand first; a paid tier with batch resize and API access may come later.

Can I batch resize multiple images?

Yes — one click exports your photo resized to all 17 marketplace presets as a ZIP. Single-image batch export is built in; multi-image upload is on the roadmap.

Do you support my country's platform?

Yes — imgsize.cc supports Amazon (US, IN), Etsy, Shopify, Walmart, Flipkart, Instagram, TikTok, YouTube, LinkedIn, X, Facebook, Pinterest, Threads, Mastodon, Twitch, Snapchat, Behance, Substack, Medium, Dribbble, Tumblr, Vimeo, SoundCloud, Discord, WhatsApp and Spotify. If we don't have your platform yet, request it via email.

What image formats can I export?

JPEG, PNG, TIFF, and GIF. PNG is the default for product photos because it preserves transparency and is the format Amazon prefers. JPEG is smaller and great for social posts.

Social Preview Size: 1280×640 (2026 Spec)

GitHub social preview image size: the 2026 spec

Getting GitHub social preview image dimensions right matters for both reach and visual quality. This guide covers the official 1280×640 pixel specification, format requirements, and common pitfalls when preparing images for GitHub social preview.

Why 1280×640 pixels

The 1280×640 standard is GitHub social preview's recommended upload dimension. Files smaller than this are auto-upscaled and render blurry on high-DPI screens; files larger are downscaled by GitHub social preview's CDN. The aspect ratio is 2:1.

Specification breakdown

Size: 1280×640 px
Format: JPEG, PNG
Use case: Repository OG image, profile page banner

The "safe area" inside the frame

Crop the central content of your image to the central 70% horizontal, 80% vertical. GitHub social preview may crop or overlay UI elements near the edges, so critical content should stay well within the safe zone.

Common mistakes

Critical content at edges — clipped when shared on Twitter/LinkedIn

Frequently asked questions

How to set this? Repository → Settings → Social preview → Upload an image.

How imgsize.cc handles it

Drop your source image into the workbench above. The crop box defaults to the 2:1 aspect ratio that matches GitHub social preview's spec. Resize, crop, and download as a 1280×640 pixel PNG — all in your browser, no upload required.

Social Preview

Spec details