The best Blogger image is not simply the smallest file. It must remain sharp at its displayed size, fit the theme's crop, and use a format suited to its content. A hero photograph, interface screenshot, and transparent logo should not share one export setting.
Choose Dimensions by Display Role
Inspect the live theme and determine the largest width at which the image appears. Prepare a delivery copy close to that need, with enough resolution for sharp display. Avoid uploading massive originals merely because Blogger can accept them.
| Role | Practical starting width | Format starting point | Quality priority |
|---|---|---|---|
| Hero or featured photo | About 1200-1600 px, then test theme crop | JPG or WebP | Subject clarity and crop |
| Inline article photo | About 800-1200 px | JPG or WebP | Detail at article width |
| Screenshot | Wide enough for readable text | PNG or lossless WebP | Small text and controls |
| Logo or transparent graphic | Match intended display with margin | PNG or WebP with alpha | Edges and transparency |
| Diagram or infographic | Large enough for labels on mobile | PNG, JPG, or WebP after testing | Label readability |
JPG vs PNG vs WebP for Blogger
JPG
Use JPG as a reliable starting point for photographs without transparency. Reduce quality carefully and inspect faces, texture, and gradients.
PNG
Use PNG when crisp text, flat graphics, or transparency justify its larger file. It is also valuable as a master before creating delivery copies.
WebP
Use WebP when testing shows a meaningful size reduction with acceptable quality. It supports photographic compression and transparency workflows.
Quality Checks Before Upload
- View the image at its normal article size.
- Zoom screenshots only to inspect text and artifacts.
- Test transparent edges on light and dark backgrounds.
- Check the featured-image crop on mobile.
- Record file size before and after optimization.
Use ConvertiImage to create and compare resized or converted delivery copies while preserving the source file.
Frequently Asked Questions
No. It is a useful starting point for many blog images, but the correct width depends on the theme, crop, role, and required detail.
Both can work. Compare file size and visible quality from the same source, then choose the better delivery copy.
JPG can soften small text. Start with PNG or lossless WebP and test whether another format remains readable.
Yes. An undersized image may appear blurry when the theme enlarges it or on high-density screens.
