Reduce file size
Compress Image Online
Compress JPG, PNG and WebP images to a target file size in KB or MB. Use the size slider or quality control privately in your browser.
Choose an image
Drop a file here or choose one from your device.
Private browser processing · Maximum 50 MBBefore you start
What Compress Image does and when to use it
Use compression when an image already has suitable dimensions but its file is too large for a website, form, marketplace or email. ResizeImg lets you choose a direct quality setting or a maximum size in KB or MB. The target-size option is useful when another service enforces a strict upload limit; the quality option is better when visual consistency matters more than an exact number.
Best for
Common uses
- Meeting an upload limit measured in KB or MB
- Reducing website and email image weight
- Comparing JPG, PNG and WebP output
Under the hood
How the browser processes it
The browser decodes the selected image into a canvas. For JPG and WebP target-size output, ResizeImg searches for the highest practical encoder quality below the chosen limit. If even a very low quality cannot reach that limit, it progressively reduces pixel dimensions. PNG encoding is lossless, so an unusually small PNG target may require reduced dimensions instead of a quality change.
Practical checklist
Tips for a better result
- Keep a copy of the untouched original
- Try WebP or JPG for photographs
- Inspect hair, text and sharp edges before downloading
Know the limits
What this tool cannot promise
A target is a maximum rather than a promise of an exact byte count. Browser encoders differ slightly, and an extremely small target may require a visibly smaller image. Re-encoding also creates a new file and does not preserve every item of embedded image metadata.
Simple workflow
How to compress image online
- 01
Choose an image from your device.
- 02
Select a target size in KB or MB, or choose a quality level.
- 03
Compress, compare the size and download.
Questions and answers
Compress Image FAQ
Can I compress an image to a specific size in KB or MB?
Yes. Choose Target size, move the slider or enter an exact value, then select KB or MB. ResizeImg aims for that maximum while preserving as much quality as practical.
Does image compression reduce quality?
Lossy JPG and WebP compression can remove some detail. Start near 82% and lower it gradually until the file is small enough while still looking clean.
Are images uploaded to a server?
No. ResizeImg performs the compression in your browser, so your selected image stays on your device.