First identify the exact image file your page is displaying. Compare its pixel dimensions and appearance with the original: a page may be enlarging a small thumbnail, serving a compressed variant, or softening an image during resizing. Use a larger source when there are not enough pixels; when compression has damaged detail, export again from the best original with less aggressive compression. Sharpening can sometimes help with mild softness from resizing, but it cannot restore detail that was discarded.
1. Find out whether the original is blurry
Open the image file you uploaded, or the best-quality original you still have, and inspect it alongside the image on the site. If the original is already soft or blocky, the problem predates the page display. If the original looks clean but the site version does not, investigate which generated image variant is being served and whether a plugin, CDN, or theme is resizing or converting it. WordPress documents image processing at multiple stages, including in the browser and on the server; comparing the original, generated variants, and served file helps narrow down where the change occurs. WordPress client-side image processing
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2. Check whether the displayed image has enough pixels
Compare the image file’s intrinsic pixel dimensions with the size at which it appears on the page. A smaller thumbnail stretched into a larger display area can look blurry even if the file itself is intact. Check the block or theme settings to see whether the page is using a small image size where a larger variant would be appropriate.
There is no single pixel dimension that is right for every image placement. WordPress.com recommends using a larger, high-quality source when needed and selecting a larger image size in block settings. Its guidance puts the limitation plainly: “You can size down a high-quality image file, but you can’t size up a low-quality image file with good results.” WordPress.com: Troubleshooting blurry images
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3. Distinguish compression damage from resize softness
Blockiness, smearing, or lost fine detail
JPEG is a lossy format: saving a photo as JPEG discards some image information. If you see compression artifacts, make a fresh export from the highest-quality original available and use less aggressive compression. Avoid repeatedly saving an already degraded copy when you can return to a better source. The useful quality setting depends on the image, so compare a test export with the source rather than relying on one universal quality percentage. WordPress: Image size and quality
Slight softness after resizing
Resizing can make an image look a little soft. Inspect the resized result at its actual display size; modest sharpening may improve its appearance. Treat sharpening as a finishing adjustment, not a way to recover source detail that is missing. Avoid pushing it so far that bright or dark halos appear around edges. WordPress: Image size and quality
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4. Check the image pipeline on a WordPress site
Do not assume the uploaded file is the file visitors receive. WordPress’s documented client-side processing can compress, resize, convert, rotate, and generate thumbnails, alongside server-side processing. Compare the original upload with the generated sizes and the file actually served by the page. If an upload fails with a transcoding error, WordPress lists unsupported or corrupt input as possible causes. The guide’s troubleshooting section lists JPEG, PNG, WebP, AVIF, GIF, and HEIC among supported formats. WordPress client-side image processing
If an optimizer is active, review its quality, resize, conversion, and original-backup settings. Test changes on a copy and inspect the resulting file rather than guessing which stage caused the loss. For example, Imagify documents optional original backups and re-optimization at a different compression level; these features can help manage future exports, but they do not reconstruct discarded detail. Imagify documentation
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WordPress JPEG quality controls
For WordPress JPEG handling, jpeg_quality is a documented control, and WordPress’s client-side processing guide also references wp_editor_set_quality. Which control applies depends on the processing path and image editor, so changing one setting may not affect every generated output. WordPress: jpeg_quality WordPress client-side image processing
5. Choose a format for its trade-offs, not as a blur fix
Changing formats may alter file size and visual quality, but conversion cannot bring back detail already lost. In a 2022 post, WordPress Core reported that its generated WebP files were about 30% smaller on average than JPEG files at the same visual quality. That is a project-reported average, not a guarantee for a particular image or proof that converting a blurry file will improve it. WordPress Core: WebP conversion in Core
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When comparing exports, judge visible fidelity at the actual display size alongside the file size and loading needs. Preserve an untouched original if you may want to try different settings later.
Quick Recap
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