An application form, website, email, or upload portal rejects an image because its file size is too large.
Compress Image to Exact KB
Compress a JPG, PNG, or WebP image toward a target size in KB or MB, entirely in your browser.
Start here
Choose a JPG, PNG, or WebP image.
Browser-first
Your image is compressed locally in your browser and is not uploaded to a server.
Useful for
Fit a photo under an upload limit
Compression strategy
Quality is adjusted first. Pixel dimensions are reduced only when quality alone cannot meet the limit.
Quick answer
Reduce an image toward a target KB or MB size
Choose a JPG, PNG, or WebP image, enter the file-size target, and let the tool adjust quality and dimensions to create a smaller downloadable copy.
Some images cannot hit an exact byte target without a visible quality or dimension tradeoff, especially with very small limits or lossless PNG content.
Image Resizer: Resize an image locally in your browser for uploads, profile pictures, forms, and smaller web-friendly files.
About this tool
Compress a JPG, PNG, or WebP image toward a target size in KB or MB, entirely in your browser.
Your image is compressed locally in your browser and is not uploaded to a server.
Reminder
The target is treated as a maximum. Because image encoders work in discrete quality and pixel steps, the result may be slightly below the target rather than exactly equal to it. Transparency is removed when you choose JPG.
How to use it
- Choose a JPG, PNG, or WebP image.
- Enter the maximum target size in KB or MB and choose an output format.
- Compress the image, inspect the preview and actual size, then download it.
Common use cases
- Fit a photo under an upload limit
- Reduce an image for email or a web form
- Create a smaller JPG or WebP for a website
- Compare output quality before submitting a file
How Target-Size Compression Works
The calculator treats your KB or MB value as a maximum file size. It tests output quality and, when necessary, smaller pixel dimensions until it finds a result that fits below that limit.
Because browsers encode images in discrete steps, an output can be close to the target without matching the exact byte count. A visibly acceptable image below the upload limit is usually the useful result.
| Goal | Best first choice | Tradeoff |
|---|---|---|
| Ordinary photo | JPG | Small files, but no transparency |
| Web photo or graphic | WebP | Often efficient, but confirm destination support |
| Transparent source | WebP | Can retain transparency; confirm the destination accepts WebP |
Example: Fit a Photo Under 200 KB
Suppose a form accepts images up to 200 KB. Enter 200 KB, choose JPG or WebP, and compress. If quality-only adjustment cannot meet the limit, the tool reduces dimensions and reports the final pixel size and actual file size.
- Inspect faces, small text, and sharp edges at full size before downloading.
- Use Image Cropper first if unwanted background is consuming pixels.
- Keep the original file because compression and downscaling are not reversible.
FAQ
Can I compress an image to exactly 100 KB?
The tool searches for the closest result at or below 100 KB. Exact byte-for-byte matching is not always possible because browser image encoders use discrete settings.
Will compression change the image dimensions?
It first adjusts encoding quality. If that is not enough to meet the limit, it may reduce pixel dimensions as well.
Which output format should I choose?
JPG is widely compatible for ordinary photos. WebP often produces a smaller web image and can retain transparency. This compressor outputs WebP or JPG, not PNG.
Are my images uploaded?
No. Reading, compression, preview, and download happen locally in your browser.