PubTooHow to use PubToo
Import, adjust, export. Compression runs automatically; you only choose which results to save.
Add your images
Drop images or a folder into the window, or choose files from the picker. The default is Quality 30%. Original files stay unchanged.
Choose a compression mode
Quality adjusts lossy encoding. Size sets a strict file size limit. Reduce sets the maximum as a percentage of the original: reduce by 60% means keep at most 40%. 1 KB = 1,000 bytes; 1 MB = 1,000,000 bytes.
Compare the result
Pause after changing a setting and the result updates automatically. Drag to pan and pinch to zoom. Use Fit to see the whole image; click the zoom percentage for 100%. The result card shows file size, dimensions and savings.
Export one or all
Export Image saves the selected result. Export All saves all completed results. Choose an output folder. A number is added when a filename already exists. Failed items can be retried from the context menu.
Sizes and format limits
If a target cannot be met, increase the limit or allow resizing. PNG and GIF do not use a lossy quality slider. JPEG and HEIC replace transparency with white. RAW is rendered using system support, without RAW editing. Animations keep their frames and playback speed; GIF timing is limited to hundredths of a second. Processing limits: 80MP per image, up to 300 animation frames and 256MB decoded animation data.
Purchase and support
PubToo will be a one-time paid download from the Mac App Store, without subscriptions or in-app purchases. The United States price is US$0.99; prices in other stores may differ. Apple handles payment and refund requests.
Contact us
For help, include your macOS version, PubToo version, image format and error message. You do not need to send private originals.
support@pubtoo.com