View CTB files in your browser
The file Chitubox slices a resin print into, a picture of the screen for every layer. Open one right here and see the print before it cures. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your print opens in 3D, rebuilt from its layers, with a bar under it to build it up layer by layer and the slicer's picture and settings beside it.
- The layer bar • Build it up, the cut at each layer lit
- Inspect • The layer as the screen lights it, and its exposure
- Its size, layers, resin and print time
- Export • Layers as PNG or ZIP, STL and PNG
About CTB
Chitubox, made by CBD-Tech in Shenzhen, slices models for the resin printers built on its ChiTu boards, from Elegoo, Phrozen, Anycubic, Creality and others. CBDDLP and PHOTON came first, and CTB, which can encipher its layers, took over. Each layer is a picture of what the printer's screen lights, its pixels in runs, after a header of the exposure, lift, layer height and the slicer's two pictures of the print.
The printer reads the file from its USB stick, and nothing built into Windows, macOS or phones opens one. Chitubox and UVtools show one on a computer, and the printer's own screen shows the slicer's picture.
Filepeek reads the layers in your browser and rebuilds the print in 3D from them. Drag the bar under it to build it up layer by layer, the cut at that layer lit, and Inspect shows the layer as the screen lights it, with its exposure, and the job's resin, print time, layer height and printer. Export saves the layer as PNG, every layer as a ZIP, the print as STL and the slicer's picture.
Chitubox sliced file
.ctb • .cbddlp • .photon
Format
- MIME type
- application/octet-stream
- Made by
- CBD-Tech
Inside the file
- Layers
- A picture of the screen each, its pixels in runs
- Exposure
- Seconds a layer, longer for the bottom layers
- Pictures
- A small and a large preview of the print
- Settings
- Layer height, lift, resin and the printer's screen
Opens in every browser
Filepeek opens CTB, CBDDLP and PHOTON files in Chrome, Edge, Firefox and Safari. On their own, browsers download them, and Windows, macOS, iOS and Android need Chitubox or UVtools to look inside one.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Apps that open CTB
- WindowsChitubox and UVtools
- MacChitubox and UVtools
- iPhone and iPadNo app built in opens it
- AndroidNo app built in opens it
Questions
Why does my CTB show only its pictures?
Chitubox locks the layers of the files it saves for its newest printers with a key only those printers hold. Filepeek shows the slicer's pictures and says the layers are locked, and a CTB saved for an older printer opens whole.
Can I check a print before it goes to the printer?
Yes. Drag the bar under the print to build it up layer by layer and see what each layer cures, with its exposure in Inspect, so a part that starts in midair or a missing support shows before you print.
Can I get the model back as an STL?
Yes. Export's Save as STL writes the print rebuilt from its layers, as fine as the screen's pixels and the layer height. It holds the supports too, so the model you sliced is the better start for changes.
Is every .ctb file a resin print?
No. AutoCAD keeps its color dependent plot style tables in .ctb files too, and one of those shows its About card.