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Image Compressor
Image Compressor re-encodes pictures at a lower quality and, when needed, smaller dimensions to cut file size significantly. It reports the before and after size so you can see exactly what the compression bought you.
How to use Image Compressor
- Upload the images you want to shrink.
- Choose the compression level that fits your quality needs.
- Compress and compare the reported sizes before downloading.
Where Image Compressor is useful
- Reducing photos so a page loads quickly on mobile connections.
- Getting images under an upload limit for a job application or portal.
- Cutting the weight of a gallery without visibly changing it.
Formats, algorithms and limits
Compression works by re-encoding at a lower JPEG or WebP quality, optionally with dimension reduction — the same trade-off any image optimiser makes. Screenshots and line art compress poorly with this approach because their sharp edges and flat colours carry little redundancy to remove.
Troubleshooting and honest limits
- For screenshots, convert to PNG first: lossless PNG often beats compressed JPEG on flat graphics.
- Keep the original file. Repeated compression of an already compressed image degrades it further.
- Compare a compressed image at 100% zoom before using it in print.
Frequently asked questions
How much smaller will my image get?
Photographs typically fall to 20-40% of their original size at a good quality setting. Graphics with sharp edges and flat colours save much less.
Will compressing make the picture look blurry?
At moderate quality the difference is invisible on screen; at aggressive settings you will see blocking around edges and fine texture.
Can I compress a PNG without losing transparency?
Yes, transparency is preserved when the output format supports it. Only the pixel encoding is affected by compression.
Is there a size limit?
Only your device memory, because everything is processed locally with no upload.
Related tools
Page written and reviewed by the FreeConvertio engineering team on 2026-10-14. Image Compressor runs entirely in your browser — no uploads, no account and no daily limits.