Why Do Compressed Images Look Blurry? 7 Causes and Fixes
“Blurry” can mean insufficient resolution, low quality, a mismatched format, repeated encoding, or a platform’s second compression pass. Identify the symptom before changing settings.
Identify the kind of damage
| Symptom | Likely cause | First fix |
|---|---|---|
| Everything looks soft | Small dimensions enlarged later | Increase output dimensions |
| Blocks or mosquito noise | Lossy quality too low | Raise quality or change format |
| Bands in a sky | Gradient over-quantized | Raise quality; avoid repeated encoding |
| Rough text edges | Screenshot in a lossy photo format | Use PNG/lossless WebP |
| White halo on alpha | Alpha quantization or wrong matte | Keep PNG and inspect on light/dark |
Seven common causes
- The output dimensions are smaller than the final display, so an app enlarges it.
- JPEG/WebP/AVIF quality is too low for the content.
- A screenshot, logo, or small type was forced into a lossy photo format.
- An already compressed file was repeatedly opened and re-saved.
- Transparent edges were composited against the wrong background.
- The upload platform performs another uncontrolled resize and encode.
- The preview app shows a low-quality thumbnail while the actual file is fine.
Rebuild a clean output in tinysqueeze
- Find the closest available master instead of compressing a damaged output again.
- Disable resizing and create a High quality baseline.
- Once the baseline is clean, set the longest edge the destination truly needs.
- For photos, test Balanced or Smart auto; for screenshots, keep PNG High quality.
- Send the result through the final platform and see whether it adds another compression pass.
Preventing the next incident
- Keep a protected master that daily workflows never overwrite.
- Document standard dimensions and formats for the site or project.
- Include small type, a gradient, shadows, and a face in every batch sample set.
- Do not use file size as the only acceptance criterion.
- When damage appears, compare the tool output with a file downloaded back from the platform to locate the second processing step.
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