Resize first or lower quality first?
If the original is more than 4000 pixels wide but the recipient only needs screen viewing, reducing dimensions first can remove a large amount of unnecessary data. A modest JPG or WebP quality reduction can then shrink the result further.
If the image will be printed, cropped or used in later design work, preserve more resolution.
Why PNG quality controls often make little difference
Browser PNG encoding is normally lossless, so a quality parameter may have little effect on file size. For photographic images where transparency is not required, JPG or WebP usually offers easier byte-size control.
Do not trust a fixed savings percentage before processing
Texture, noise and color complexity differ from image to image, so the same setting can produce very different results. FileNest reports actual generated bytes and savings after processing instead of promising an invented percentage first.
- Check actual output bytes for each image.
- Inspect high-detail areas such as text and faces.
- Confirm the final ZIP size before attaching it to email.
Why local compression fits email preparation
Family photos, client assets and internal screenshots usually only need a byte-size adjustment before email. They do not need an extra server-side copy just to compress them. FileNest handles image compression in the browser and can package multiple results into a ZIP.