Is compression lossless?
PNG and WebP encoding are lossless. JPEG encoding uses adjustable quality and can discard detail. Auto preserves the source format; compare the result before downloading.
Image Compression
Compress PNG, JPEG, WebP and other images locally with MultiMicroMedia. Choose lossless output or JPEG quality, compare sizes, and download without uploading files.
How to use Image Compression
- Select one image or a batch of supported images.
- Keep Auto or select PNG, JPEG or WebP; adjust JPEG quality or PNG effort as needed.
- Compress the batch, compare results, and use the sticky download button. More than three completed files download as one TAR archive.
Example: Optimize a PNG screenshot before adding it to a README or website.
Before you use the result: If encoding would grow the file, the original bytes and format are kept. JPEG can lose detail; WebP encoding is lossless. Use Auto for SVG and animations. Large images require more browser memory.
Common questions
Where does processing happen?
Work happens in your browser using Rust compiled to WebAssembly for performance, which keeps assets off a third-party upload service.
What image types are supported?
Inputs include PNG, JPEG, WebP, GIF, BMP, TIFF, ICO and SVG. Use Auto for SVG and animations. Output options are Auto, PNG, JPEG and lossless WebP. SVG rasterization and AVIF/HEIC decoding are not available here.
Why use a browser PNG compressor instead of an online upload tool?
Client-side compression avoids sending product screenshots, design assets, or private imagery to a remote server while still giving measurable file-size reductions.
Is this useful for web performance work?
Yes. Smaller PNGs reduce transfer size for marketing pages, app icons, and UI assets. Pair it with responsive image strategy and modern formats when lossy compression is acceptable.
Can I compress and download hundreds of images together?
Yes. Images process one at a time, with 24 cards per page and thumbnails loaded on demand. Pause after the current image and resume the remaining queue. The sticky download button saves one to three completed files individually, or four or more in a single TAR archive. Results use browser storage; download them before leaving the page. Large individual images and available browser storage still limit batch capacity.
Why did my requested conversion keep the original format?
MultiMicroMedia keeps the original bytes if encoding would increase file size. The widget reports when this happens and downloads the actual returned format, so a JPEG is never mislabeled as WebP.