Image Compressor Online Free
Reduce image file size up to 90% without visible quality loss. Supports JPG, PNG, WebP. Runs in your browser, no upload, no watermark.
How the Image Compressor Online Free Works
This image compressor online free uses the browser’s Canvas API to re-encode your image at a lower quality setting. Everything happens on your device — no file is ever sent to a server.
For JPG and WebP, you control quality directly. For PNG, the tool uses optimised canvas encoding to reduce file size while keeping the image lossless.
The target file size mode runs a binary search — it adjusts quality automatically until the output is as close to your target as possible in under 10 iterations.
What this tool does
Compression methods explained
Different formats compress differently. Knowing which to use saves the most space with the least visible impact.
JPG compression
Best for photos. Quality of 75-85% gives 60-80% smaller files with barely noticeable loss. Below 60% shows artifacts.
PNG compression
Lossless only. The tool uses canvas re-encoding which often strips metadata and reduces file size 10-30%.
WebP conversion
Converting JPG or PNG to WebP at 75-80% quality typically cuts file size by 25-40% with near-identical visual quality.
Target file size
Enter a target in KB and the tool automatically finds the right quality level using binary search — no manual tuning needed.
How to compress images online free
Upload images
Drop JPG, PNG, or WebP files. Up to 50 at once. No account, no sign-up.
Pick settings
Choose a quality level, use a preset, or switch on target file size mode to hit a specific KB limit.
Compress
Click Compress All. Results appear with before/after size and percentage saved per file.
Download
Download each compressed image individually or grab all files at once.
FAQ: Image Compressor Online Free
No. All compression happens locally in your browser. Your images are never sent to any server. This makes the image compressor online free completely private, with no data retention and no risk of files leaking.
Set quality to 80-90% for JPG or WebP. At these levels most people cannot see a visual difference, but file size drops by 40-70%. For PNG, use the PNG option which is lossless. Converting a PNG to WebP at 80% quality often cuts the file in half with no visible change.
Enable the Target file size option and type your target in KB. The tool runs a binary search across quality levels to get as close to that number as possible. It works best for JPG and WebP. PNG is lossless so the exact target size cannot always be reached.
JPG uses lossy compression — great for photos, handles quality reduction well. PNG is lossless and ideal for graphics with text or transparency, though file sizes are larger. WebP is a modern format that achieves better compression than both JPG and PNG while maintaining quality. Converting to WebP is the fastest way to reduce image size for websites.
Yes. Upload up to 50 images at once. All files are compressed with the same settings. The results panel shows before and after size for each image, and you can download them all at once.
This can happen when the original file was already well-optimised, or when you set quality higher than the original encoding. It also happens if you convert a small JPG to PNG. In these cases, keep the original format and lower quality slightly. Converting to WebP usually avoids this.
It depends on the original file and format. A typical uncompressed photo can shrink 60-80% as JPG at 80% quality with no noticeable visual difference. Converting to WebP often saves another 25-40% on top of that. PNGs with large areas of flat colour compress well; complex photographic PNGs compress less. The tool shows the exact savings per file after processing.