Compress Screenshots
Screenshots are mostly flat colour, text and sharp interface edges, which JPG blurs and an unoptimised PNG stores inefficiently. Reducing a screenshot to a carefully chosen palette of up to 256 colours, without dithering noise, and then optimising the PNG losslessly typically more than halves the file while text stays crisp.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
JPG, PNG, WebP, HEIC, AVIF, GIF, TIFF, SVG, RAW, PSD, JXL, BMP, ICO and more
How to use Screenshot Compressor
- 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 screenshot compressor
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
Cut PNG size by up to 80% with smart palette reduction and OxiPNG lossless optimisation, keeping transparency.
Frame screenshots in macOS, Windows or browser chrome on a gradient background with shadow and padding.
Black out, pixelate or blur regions. Redacted pixels are truly replaced, not covered.
Find API keys, tokens, passwords, emails, card numbers and IBANs in screenshots before you post them.
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
Why not save screenshots as JPG?
JPG is designed for photographs. Around text and thin lines it produces ringing and smudges, and for flat colour it is often not even smaller than a well-optimised PNG.
When should I turn dithering on?
When the screenshot contains photos or gradients, a 256-colour palette can show banding, and dithering hides it with fine noise. For plain interface and text, leave it off.
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.