WordPress Image Sizes — Resize Featured Images (Free)
WordPress resizes uploads automatically, but feeding it appropriately-sized files stops wasted bandwidth and keeps every thumbnail sharp. The Resize tool outputs the sizes most themes expect — entirely in your browser.
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Open WordPress Featured & Gallery Image SizesThe sizes WordPress uses
Classic editor sizes: thumbnail 150×150, medium 300px, large 1024px. Most modern themes request 1200×675 featured images and 1920-wide hero images. Match the theme's registered size for pixel-perfect output.
Prepare a featured image
- Open the Resize Image tool.
- Drop your artwork or photo.
- Resize to 1200×675 (16:9) for posts, or the theme's exact spec.
- Export as JPG 80% and let WordPress generate the rest — usually hundreds of KB saved.
A pre-sized featured image also powers crisp link previews via the shared 1200×630 surface most SEO plugins use.
Skip the double-resize waste
Uploading a 5MB phone photo forces WordPress (and your CDN) to create 4-6 resized copies. Feeding an already-correct 1200px file means only the small thumbnails get generated — faster site, lighter media library.
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Frequently Asked Questions
What is the recommended WordPress featured image size?
1200×675 is a common 16:9 default; always check your theme, which registers its own 'featured' size.
Should I resize before uploading to WordPress?
Yes — resizing before upload saves server work and keeps your media library lean.
Does image size affect SEO?
Speed is a ranking factor; correctly-sized, compressed images load fast. Add descriptive alt text too.