Image Compressor / WebP Converter
Resize and re-encode multiple images in your browser. Compare each result before downloading; smaller output is not guaranteed.
Practical guides
Reproducible examples that explain a tool's result, not just its buttons.
PNG quality: why the file size does not change
Apps24 disables the quality slider for PNG because this setting cannot reduce its file size. Its browser canvas encoder applies quality to JPEG and WebP, not PNG. To check this rather than assume it, we encoded the same synthetic gradient at two PNG qualities and compared bytes and SHA-256 hashes.
JPEG, WebP and PNG compared with a real photo
The same quality number does not mean the same result across formats. We uploaded NASA's Earthrise photograph to Apps24 and downloaded JPEG and WebP at 80% quality, with dimensions at 100%. The source and actual downloads below let you inspect and repeat the comparison.
What is Image Compressor / WebP Converter?
Images are processed sequentially with the browser’s canvas encoder. JPG and WebP use the quality setting. PNG ignores that setting in this implementation: to reduce PNG size, reduce dimensions or choose WebP. This is not a palette-quantization or specialist lossless PNG optimizer.
When to use this tool?
Prepare images for an upload limit or a web page. Try WebP when the destination accepts it. Keep PNG or WebP when transparency matters; exporting JPG replaces transparent areas with white.
Examples
- At 50% scale, a 2000 × 1000 image becomes 1000 × 500: one quarter of the pixels, not necessarily one quarter of the file size.
- A 1 MB input and a 1.1 MB output represent −10% savings: the result grew. Keep the original or adjust the settings.
How to use Image Compressor / WebP Converter
1. Select one or several images. 2. Set output format, dimensions and, for JPG/WebP, quality. 3. Wait for processing, inspect each file’s preview and byte size, then download the desired results.
Quick Setups
References
Frequently Asked Questions
Q: Does lower quality always give a smaller file?
A: Not necessarily compared with the original. Existing compression, detail and encoder behavior affect size. PNG quality is disabled because this encoder ignores it.
Q: Are originals changed or uploaded?
A: The tool reads local files and creates new results in the browser; originals are not overwritten. Temporary preview URLs are released when files are replaced or the tool is closed.
How it works
Canvas re-encoding can change image metadata and cannot preserve an animation as a complete animated file. Keep the original for archival or editing work.