Image Compressor Guide
Reference for reducing image file size with browser-side processing, including supported formats, quality controls, transparency limits, and common errors.
Quick answer
Upload an image, choose the output format and quality level, preview the size change, then download the compressed result.
What this tool does
The image compressor reduces file size by re-encoding an image in the browser. It helps prepare screenshots, photos, documentation images, and web assets for faster sharing or publishing.
Supported input
- Common browser-decodable image formats such as PNG, JPEG, and WebP
- Screenshots, photos, UI exports, and simple graphics
- Files that fit comfortably in browser memory
Output
- Downloadable compressed image
- File size comparison
- Format and quality-dependent result
Step-by-step use
- Select an image file.
- Review the original size and dimensions.
- Choose an output format.
- Adjust quality and preview the result.
- Compare original and output size.
- Download the compressed image.
Data handling and processing behavior
Processing is handled in the browser for this tool based on the current public implementation. Avoid entering sensitive images unless you have reviewed the implementation.
Limits
- PNG compression may not reduce size much for some images.
- JPEG does not preserve transparency.
- Canvas-based processing may change metadata or color profile details.
- Very large images may slow mobile browsers or low-memory devices.
Common errors
The output is larger
Some PNGs and flat graphics are already efficient. Try another format or resize the image first.
Transparency disappeared
The image was likely exported to JPEG. Use PNG or WebP when transparency matters.
Text looks fuzzy
The quality value may be too low or the image was resized too aggressively.
Next steps
- Image Compressor — open the tool
- Image compression workflow guide — compare quality tradeoffs
- Image Resizer — reduce dimensions before compression
- Image Format Converter — prepare the right output format