Private browser compression
Compress an image to a target size
Choose a KB ceiling and keep the best measured result below it instead of repeatedly guessing at a quality percentage.
Target-size compressor
The browser tests quality and dimensions, then keeps the best result it can produce at or below your limit.
Drop an image here
JPG, PNG, WebP, or AVIF · up to 25 MB
Measured output instead of a rough estimate
File size changes with texture, dimensions, format, and browser encoder behavior. PixelTransform measures candidate files instead of treating a quality percentage as a promised KB result.
The search starts with quality and reduces dimensions only when the requested limit cannot be reached responsibly. Keep a full-resolution master for later exports.
How to reach a KB limit
- 1
Choose an image
Load the best JPG, PNG, WebP, or AVIF source from this device.
- 2
Enter the maximum KB
Set a ceiling slightly below the destination's published limit and choose JPEG or WebP.
- 3
Review and download
Check measured size, dimensions, format, and visible quality before saving.
Useful for strict upload limits
Application forms
Prepare a photo below a fixed limit without repeated manual exports.
Marketplace listings
Reduce listing images while keeping product details readable.
Email attachments
Create a predictable smaller copy while retaining the original master.
Know before you compress
A target is a ceiling, not a guarantee of an exact byte match.
- Very small targets may require lower dimensions or visible compression.
- The current output choices are JPEG and WebP; transparency is flattened for JPEG.
- Different browsers may produce slightly different encoded sizes from the same source.
Target-size compression questions
Does the image upload to PixelTransform?
No. Target-size compression runs in the browser on this device.
Why did the dimensions change?
The requested limit could not be reached at a useful quality, so proportional resizing was needed.
Should I target the exact website limit?
Use a small margin below it because platforms may count KB differently or modify the file during upload.