Image Compressor: Shrink JPG, PNG and WebP in Your Browser (Free)
"Compress image" buttons everywhere upload your photo to someone else's server. This one does not: the encoding happens in your browser tab, and the file never leaves the device.
Here is how to get the size you need with the least visible damage, which format to pick, and when dimensions beat quality.
What the compressor actually controls
Three levers decide the output weight: pixel dimensions, encoding quality and format. The tool exposes all three: a Pixels/MM/CM dimension control, a quality ladder (Gentle, Balanced, Strong) and a target-size mode that walks quality steps for you until the byte count lands.
Output format choices include JPG, PNG and WebP; WebP typically beats JPG at the same visible quality, and PNG is the right answer only when you need lossless edges or transparency.
Step by step
- Add one or several images; previews and per-file sizes appear locally.
Pick a quality step and compare the reported output bytes against the original.
Need an exact number? Switch to target-size mode and type the KB or MB the destination requires.
Download individually or take everything together; nothing is stored anywhere.
Where quality actually goes
Compression discards high-frequency detail first: sensor noise, fabric texture, leaf clutter. Smooth areas, faces at screen size and text survive much longer. The visible cliff appears when you combine deep quality cuts with big zoom or print.
Rule of thumb: for screen use, Balanced is usually invisible; for print, keep Gentle and reduce dimensions instead; for thumbnails, Strong plus smaller pixels is free weight savings.
Batch work without surprises
- Per-file output bytes are listed, so one bad result never hides inside a zip.
Mixed batches keep each file's own format choice.
Re-compressing an already compressed image stacks losses; always go back to the original.
WebP output is ideal for websites; keep JPG when the destination is an old portal or printer.
Try it free: Image Compressor | runs entirely in your browser, no uploads and no signup.