Compress PCX Images
PCX's run-length compression only helps on long runs of identical bytes, so scans and detailed artwork compress poorly. PNG's DEFLATE compression handles them far better, keeps every pixel and palette colour exactly, and opens in every browser and editor, which PCX no longer does.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
PCX expected · other image formats also work
How to use Compress PCX
- 1
Drop your images, choose files, or paste from the clipboard.
- 2
Adjust the options. The preview updates as you change them.
- 3
Click Compress. Files are processed on your device.
- 4
Download each result or everything as a ZIP.
Why use Aback Images for compress pcx
Best-in-class encoders
MozJPEG for JPG, OxiPNG and palette quantisation for PNG, libwebp and libavif for WebP and AVIF, all compiled to WebAssembly.
Live before/after
See the result and its file size on your actual image before processing the batch.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
Never bigger than the original
If compression cannot beat your file, the original is returned unchanged with a note.
Related tools
Convert PCX to PNG in your browser, ready for screenshots, logos, graphics and anything that needs transparency. Batch, private, no uploads.
Convert PCX to JPG in your browser, ready for photographs that need to open anywhere. Batch, private, no uploads.
Cut PNG size by up to 80% with smart palette reduction and OxiPNG lossless optimisation, keeping transparency.
The real format, dimensions, bit depth, alpha, frames, DPI, estimated JPEG quality and a byte breakdown.
Shrink JPG, PNG, WebP, AVIF and GIF files with MozJPEG, OxiPNG and modern codecs, with a live before/after preview.
Make JPEG photos smaller with MozJPEG, the encoder that beats standard JPEG by 10-15% at the same quality.
Re-encode WebP images smaller with libwebp's best settings, including animated WebP.
Shrink animated GIFs by reducing colours, dropping frames and resizing, while keeping the animation.
Frequently asked questions
Is anything lost?
No pixels or colours: PNG is lossless and holds the full palette or 24-bit colour of a PCX. Only the PCX header's own fields, such as its DPI, are not carried over.
Can I keep the PCX format?
PCX's own compression is the limiting factor, so a re-saved PCX would not be meaningfully smaller. Write PCX (with PNG to PCX, for example) only when a program requires it.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.