Introduction: One Size Does Not Fit All Platforms
The same image that looks perfect as a Blogger featured post needs completely different dimensions for Instagram, and different again for a WordPress thumbnail. Upload the wrong size and you get cropped faces, stretched designs, and blurry banners.
The solution is simple: resize images online to the exact dimensions each platform expects — before uploading. A free image resizer handles this in under a minute, and you only need to do it once per image.
This guide covers the correct image dimensions for every major platform — plus a step-by-step process for resizing images correctly every time.
The Correct Image Dimensions for Every Platform
Use this reference table before every upload. Bookmark it — these dimensions apply across all major blogging and social media platforms in 2026.
| Platform & Image Type | Recommended Size | Aspect Ratio | Max File Size |
|---|---|---|---|
| Blogger — Featured Image | 1200×628 px | 1.91:1 | Under 500 KB |
| Blogger — In-Post Image | 800–1200 px wide | Original ratio | Under 200 KB |
| WordPress — Featured Image | 1200×630 px | 1.91:1 | Under 500 KB |
| WordPress — In-Post Image | 800 px wide | Original ratio | Under 150 KB |
| WordPress — Thumbnail | 150×150 px | 1:1 | Under 30 KB |
| Instagram — Square Post | 1080×1080 px | 1:1 | Under 8 MB |
| Instagram — Portrait Post | 1080×1350 px | 4:5 | Under 8 MB |
| Instagram — Story / Reel | 1080×1920 px | 9:16 | Under 30 MB |
| Facebook — Link Preview | 1200×630 px | 1.91:1 | Under 8 MB |
| Twitter/X — Post Image | 1200×675 px | 16:9 | Under 5 MB |
| Pinterest — Pin Image | 1000×1500 px | 2:3 | Under 10 MB |
| Open Graph (og:image) | 1200×630 px | 1.91:1 | Under 300 KB |
Step-by-Step: How to Resize Images for Any Platform
Decide where the image will be used. Use the table above to find the correct pixel dimensions. For example: Blogger featured image → 1200×628px. Instagram square post → 1080×1080px.
Navigate to convertiimage.com. No sign-up, no app download. Works on desktop, tablet, and mobile. Upload your original image — JPG, PNG, or WebP accepted.
For most platforms, entering only the width is enough — keep "Maintain Aspect Ratio" enabled and the height adjusts automatically. For platforms requiring an exact ratio (e.g., Instagram 1:1 = 1080×1080px), enter both width and height explicitly.
Choose JPG for photographs. Choose PNG for images with text, logos, or transparent areas. For maximum performance, choose WebP — Blogger, WordPress, and most browsers support it natively in 2026.
Click Resize, then Download. Upload the resized file directly to your platform. For Blogger: Insert Image → upload your resized file. For WordPress: Media Library → Add New → upload. For Instagram: use the native app upload flow.
Platform-Specific Tips
Blogger (Blogspot) Tips
- Featured images display at 1200×628px in link previews (og:image). Use this size for every post's thumbnail.
- In-post images: resize to 800–1000px wide. Blogger themes typically limit post width to 740–840px on desktop.
- Blogger stores uploaded images in Google Photos — they are served via Google's CDN, which supports WebP delivery automatically.
- Add explicit
width="800" height="533"attributes to every<img>tag to prevent layout shift (CLS).
WordPress Tips
- Featured images: use 1200×630px. WordPress generates thumbnails (150×150px) and medium sizes (300×300px) automatically from this.
- In-post images: resize to 800px wide before uploading — WordPress's built-in compression isn't always efficient on oversized originals.
- Install a compression plugin (ShortPixel, Imagify) to automatically compress uploads — but always resize manually first for maximum control.
- Use the srcset attribute for responsive images — WordPress generates this automatically when you set image dimensions correctly.
Instagram Tips
- Square posts: 1080×1080px. Portrait posts (best for feed): 1080×1350px.
- Instagram recompresses all uploaded images — upload at full 1080px resolution to minimize generation loss from their compression.
- Stories and Reels: 1080×1920px (9:16 vertical). Leave 250px of safe zone at top and bottom free of critical content.
- Avoid uploading images wider than 1080px — Instagram compresses them aggressively and you waste upload bandwidth.
Tips for Building a Consistent Image Workflow
- 🎯 Create a platform size cheat sheet — print or bookmark the table above and reference it before every upload
- 🎯 Batch resize in one session — ConvertIimage supports multiple uploads; resize all images for a blog post in one go
- 🎯 Name files descriptively before resizing — "blue-running-shoes-1200w.jpg" helps you track which size is which
- 🎯 Keep original files in a separate "Originals" folder — you may need to re-export for different platforms later
- 🎯 Test the og:image preview using Facebook's Sharing Debugger or Twitter Card Validator before publishing
Conclusion: Right Size, Right Platform, Every Time
Platform-specific image sizing is the difference between a blog post that looks polished everywhere it's shared — and one that gets cropped, distorted, or displayed as a tiny thumbnail in link previews.
With this reference table and a free tool to resize images online, getting dimensions right takes 60 seconds per image. Build this into your publishing workflow and you'll never deal with broken previews or oversized uploads again.
Related Resources
Frequently Asked Questions
The ideal Blogger featured image size is 1200×628px (1.91:1 ratio). This matches the og:image standard used by Facebook, Twitter, and Google when your post link is shared — ensuring it displays as a large, attractive preview card rather than a cropped thumbnail. Keep the file under 300–500 KB for optimal load speed.
For WordPress featured images: 1200×630px. For in-post content images: 800px wide (let height adjust with aspect ratio). WordPress automatically generates smaller thumbnail versions (150×150px, 300×300px) from your uploaded image, so upload at the largest size you need and let WordPress handle thumbnails from there.
For Instagram feed posts: square = 1080×1080px, portrait = 1080×1350px (4:5 ratio — gets more screen space in the feed). Stories and Reels: 1080×1920px (9:16 vertical). Uploading at exactly 1080px wide prevents Instagram from upscaling or downscaling, which adds compression artifacts.
Yes. ConvertIimage works fully on iOS and Android browsers — no app download needed. Open convertiimage.com in Chrome or Safari, upload your photo from your camera roll, enter the target width (e.g., 1200px for Blogger), and download the resized image directly to your phone. You can then upload it to Blogger from your phone's gallery.
Resizing DOWN (to smaller dimensions) does not reduce visible quality. Social media platforms add their own compression on top of your upload — uploading at the exact recommended dimensions (e.g., 1080px for Instagram) minimizes the platform's re-compression and gives you the sharpest possible result. Uploading oversized images forces the platform to downscale, adding an extra compression step.
