How to Reduce Image File Size Online
Last Updated: August 15, 2026
Large image files slow down websites, fill up storage, and cause upload failures. Reducing image file size — while keeping visual quality — is essential for web performance, social media, and email.
Why are images so large?
Modern cameras and phones capture increasingly high-resolution images. A single photo from a flagship phone can be 5–15 MB. Raw files and screenshots are often even larger because they use minimal compression.
How image compression works
Image compression reduces file size by removing redundant data. There are two types:
- Lossy compression — removes data that is less visible to the human eye (most effective for photos).
- Lossless compression — removes only redundant data without any quality loss (best for graphics and text).
Frequently Asked Questions
It depends on the original format and quality. JPG photos typically reduce 40–80%. PNG files with lots of flat color can reduce even more.
Lossless compression preserves quality perfectly but produces larger files. For most purposes, lossy compression at 70–85% quality is visually indistinguishable from the original.