How to Reduce Image File Size Online
Reduce image file size by compressing (quality/format), resizing pixel dimensions, or aiming for a target byte size. MiniFyPNG’s free tools do all three in your browser so files are not uploaded for these tools.
Cut image weight with compression, conversion, resizing, or a target size — all on your device.
Start with the free image compressor for quality and format control, use the image resizer when the canvas is oversized for display, and use the 100 KB tool when a form or listing has a hard limit.
What does reducing image size mean?
Reducing image size means cutting how many bytes a file uses. That can come from compression (how pixels are encoded), resizing (how many pixels there are), format conversion, or a target-size search — not from one magic setting.
How can you make an image file smaller?
- 1
Decide what you can change
If the image must keep transparency, stay on PNG or WebP. If it is a photo, JPG or WebP usually shrinks more. If pixel dimensions are oversized for display, resize first.
- 2
Compress in the image compressor
Open the free image compressor for PNG, JPG, and WebP. Set quality, optionally change format, and compare real byte sizes.
- 3
Or resize when dimensions are the problem
Use the image resizer to crop or scale down. Fewer pixels often save more space than quality alone.
- 4
Aim for a target when you have a hard limit
If you need about 100 KB, use the dedicated 100 KB tool. It searches toward the target and shows whether it was met.
- 5
Download and verify
Download the result and confirm it still looks acceptable for your use case. There is no single setting that fits every image.
What should you try first?
- A 4000px-wide phone photo used only as a 800px blog hero — resize, then compress.
- A PNG logo that must stay sharp: compress as PNG, or convert to WebP if the destination supports it.
Reducing image size FAQ
Is compression the same as resizing?
No. Compression changes how pixels are encoded; resizing changes how many pixels there are. Both can reduce file size.
Which format is smallest?
It depends on the image. Photos often favor JPG or WebP; graphics with transparency often stay on PNG or WebP with alpha.
Can every image hit a fixed KB limit?
Not always. MiniFyPNG shows the closest size when a target cannot be reached honestly.
Do these tools upload my images?
No. The listed MiniFyPNG tools process files in your browser.