How to reduce image file size in KB or MB
To reduce an image's file size, lower JPG or WebP quality, reduce pixel dimensions if appropriate, or choose a more suitable format. Check the downloaded size against your upload limit. Our compressor provides manual quality and width controls; it does not automatically guarantee an exact KB target.
Start with the upload requirements
Read the accepted formats, maximum file size, and required dimensions before editing. A form might require a JPG under 100 KB and also specify minimum pixel dimensions. Lowering quality alone may be enough; reducing the width below that minimum would make the image unsuitable.
Keep your original file. If it is already accepted and looks clear, re-encoding it may add unnecessary artifacts or even make it larger. An image's complexity, existing compression, dimensions, and encoder all affect the result.
Use the compressor's actual result
Choose the image in the compressor, select an accepted output format, and adjust quality. Use JPG for a photo when the destination requires JPEG, or try WebP when it is accepted. If transparency matters, keep PNG or choose WebP.
The maximum-width control reduces the width only when the source is wider than your setting; it keeps the proportions and does not enlarge a small image. Compress, then compare the original and result sizes before downloading. If the result is larger, the tool says so.
- Choose the image and an accepted export format.
- Try a moderate quality setting for JPG or WebP.
- Reduce the maximum width only if the destination permits it.
- Check the exported size and preview before downloading.
How to work toward a 100 KB limit
For a form that accepts JPEG, begin with JPG and compare the first export with the limit. If it is too large, lower quality in small steps. When fine detail begins to break up, return to a higher quality and try reducing width instead, while respecting any minimum dimensions.
Our tool does not have an automatic “compress to 100 KB” mode. You may need several adjustments, and some images cannot meet a tight limit at useful dimensions and quality. Check the saved file's exact byte size when a form applies a strict cutoff. The interface rounds its KB and MB display, and different services may interpret a KB as 1000 or 1024 bytes.
What does compression without losing quality mean?
Lossless compression preserves the decoded pixels. PNG uses lossless encoding, but simply re-encoding an already optimized PNG may not reduce its size. The PNG option therefore has no quality slider.
JPG and the WebP exports from this tool use lossy encoding. A lower quality setting can remove detail even when the change is hard to notice at ordinary viewing size. Resizing removes pixels too. Neither process should be described as restoring or preserving every detail.
Check line art differently from a photograph
For a sketch or screenshot, look at pencil lines, lettering, and edges. Compression artifacts can make these harder to read. PNG may be worth the larger file for crisp artwork, while JPG or WebP can be a better size tradeoff for a photo.
Keep transparency in mind as well: JPG replaces transparent areas with the selected background color. Review the final preview and confirm that the file format, dimensions, and size all meet your destination's requirements.
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Common questions
Why did my compressed image become larger?
The original may already be optimized, or the chosen format or settings may use more bytes. The tool shows the real size change. Try a lower lossy quality, smaller dimensions, or another accepted format.
Can I compress a PNG with the quality slider?
No. PNG export is lossless and has no quality slider. You can reduce dimensions, or use JPG or WebP when their compression and transparency handling suit your needs.