The compressor is careful rather than greedy. A re-encoded image replaces the original only if it saves at least 8%, image masks and 1-bit scans are copied byte-for-byte, and text is never turned into pixels. The published benchmark at /compression-benchmark shows what this does to the sample files that ship with the app; the image-heavy board deck drops by more than 90% while text-only samples move by a few percent, and the method is there for anyone to repeat. All of it runs in the browser: the deck you have not presented yet is never uploaded, and the original stays as it was on your disk.
How it works
- Drop the deck or scan and open Compress
- Compare the computed size of each level with 5 MB
- Download Balanced if it fits; check photos at 200% zoom before sending
Questions people ask
How much smaller will a slide deck get?
It depends entirely on the images inside, so Bindery measures instead of promising. Decks built from screenshots and photos routinely lose 80–90% at Balanced because the images were far larger than the slide needed. A deck that is mostly text and vector charts will hardly move, and the cards will show that.
Do charts and diagrams lose sharpness?
Vector charts, shapes and text are not images and are not touched; they stay crisp at any zoom. Only raster images — photographs, screenshots, scans — are resampled, and only down to the level’s DPI target relative to the page size.
Can I compress several files in one go?
Yes. Add a Compress step to a Pipeline and it runs across every loaded file with the level you choose; the free plan runs pipelines of up to five files, Pro removes the limit. Each file is processed locally, one after another, and the results download together.