Image Quality vs File Size: Practical Guide
Quality settings control the trade-off between visual detail and output size. This guide helps you choose practical defaults for common use cases in PicShift.
Quick quality presets
| Target | Suggested quality | Use case |
|---|---|---|
| High quality | 85-92 | Portfolio images, product photos |
| Balanced | 72-84 | General websites, blogs, social sharing |
| Small size | 55-71 | Messaging apps, preview thumbnails |
Format-specific tips
- JPG works well for photos and gives predictable size reduction.
- WebP keeps similar quality at smaller sizes than JPG for web delivery.
- AVIF is highly efficient for large photos, and encoding overhead is higher for small images.
- PNG is lossless and becomes larger when converted from lossy formats.
Why output size can increase
If a converted file becomes larger, it can be caused by format behavior, deep prior compression, or both. See Why Output Size Can Increase for how PicShift calculates B/pixel and applies this explanation logic.
A simple optimization workflow
- Start with quality 80 for JPG/WebP and compare before/after visually.
- If details still look clean, lower quality in small steps (for example, -5 each step).
- Stop lowering quality when compression artifacts become noticeable on key areas.
- Use lower quality for thumbnails and higher quality for hero images.
FAQ
What quality setting is a practical default for JPG or WebP?
Quality 80 is a practical starting point for JPG and WebP in common web and sharing workflows.
Why can PNG become larger after conversion?
PNG is lossless. Converting from lossy formats such as JPG to PNG preserves exact pixel data and usually increases file size.
How should I reduce file size without visible artifacts?
Lower quality in small steps and compare key details after each step. Stop reducing when artifacts are visible in important regions.
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Last updated: 2026-03-07