Zipic guide
How to Choose Image Format and Quality on Mac
To compress images on Mac, first check the formats accepted by the destination, then compare file size and detail on a representative image. Zipic accepts JPG, PNG, and WebP images and lets you choose output format and quality. One quality setting will not suit every asset.
Choose for the destination, not file size alone
- Photos: check that the destination accepts your output format, then inspect textures, faces, and gradients for the intended use.
- Text screenshots: inspect small text, lines, and icon edges at the size people will read. Increase quality if the smaller file makes text difficult to read.
- Transparent assets: inspect transparency and edges in the output. When the destination needs a transparent background, size alone is not a sufficient selection criterion.
- Web assets: preview the output in the destination page or publishing platform and confirm that the chosen format loads correctly.
Compare the same image once before a batch
- Keep the original and select one representative image in Finder.
- Use Zipic image compression to create a copy with your chosen format and quality.
- Check output size, pixel dimensions, text or detail, and whether the destination software can open the file.
- Change one setting at a time if further reduction is needed. Batch-process similar assets after the sample fits its intended use.
Why there is no fixed compression ratio
Existing compression, image content, and the selected output format affect the final size. Different images can produce different results with the same settings. Use the generated file size rather than treating one sample as a guarantee for the whole batch.
For PDFs, first decide whether selectable text is required. Zipic PDF compression renders pages as images, which is a different operation from choosing an image format.
Zipic for Mac by PangJiong
Zipic processes images and PDFs locally, with a one-time purchase and updates through the Mac App Store.