How to use Image Compressor: steps, example, and result checks
Learn Image Compressor with a real example, practical steps, limitations, and privacy details.
When to use it
Compress JPG, PNG, and WebP images locally with quality control. It is useful for web images, email attachments, and quick sharing, with no software installation or account required.
A practical example
Choose a JPG, PNG, or WebP image, adjust quality, compare the preview and size, then download a new file.
Steps
- Choose a local image.
- Select an output format and adjust quality.
- Compare sharpness, transparency, and size before downloading.
Result checklist
- Keep the original file
- Zoom in on text and line edges
- Browsers may ignore the quality slider for PNG
Current limitations
- The browser decodes the image and re-encodes it through Canvas, so metadata such as EXIF is normally not preserved.
- Results depend on content, format, and browser encoder, and output is not guaranteed to be smaller.
When not to rely on it alone
For production configuration, contract review, print delivery, or any workflow where errors are costly, use this tool for quick preparation or inspection rather than as a replacement for validation in the source system. Test a small representative sample before processing a larger batch.
Privacy
The input or selected image is processed inside the current browser tab and is not uploaded to FreeTool to perform this task. On a shared device, clear the clipboard and downloaded files when finished.
Common questions
Why did PNG size barely change?
PNG is commonly lossless and the browser may ignore quality; try WebP or JPEG for photos.
Why did photo orientation change?
Some photos rely on EXIF orientation metadata that may be removed during re-encoding.