G-code,
without the guesswork.
Open, inspect, analyze, and convert G-code entirely in your browser. Fast on large files, private by design, and free to use.
Every byte is processed on your device. No uploads, no accounts, no tracking of file contents.
A small, sharp G-code toolkit
Three tools that cover the work between slicing and printing. More tools are on the way.
G-code Viewer
See the toolpath in 3D and 2D, scrub through layers, and inspect travel moves, speeds, and print statistics.
- 3D and 2D toolpath preview
- Layer-by-layer inspection
- Travel, retraction, and feature colors
- Works with large files
G-code Analyzer
Get print time, filament usage, cost, layer times, speed and flow stats, and practical warnings.
- Print time and material estimates
- Cost calculator with your spool price
- Layer time and filament chart
- JSON, CSV, and print reports
G-code Converter
Turn bgcode, gzip-compressed G-code, or gcode.3mf into plain G-code that any editor or printer can read.
- bgcode, gzip, and 3MF input
- Plain G-code or gzip output
- Metadata and thumbnail detection
- Compatibility report
Built for people who print
The details that matter when a print is hours long and a failed first layer is expensive.
Private by default
Files are parsed in a Web Worker on your machine. Nothing is uploaded, stored, or sent to a server.
Fast on large files
A compact Rust/WASM core and layer-aware rendering keep the interface responsive, even with hundreds of megabytes.
More than plain text
Open G-code, gzip-compressed G-code, Prusa bgcode, and Bambu/Orca gcode.3mf files in one place.
From inspect to action
Understand the file, estimate the cost, spot issues, and convert it to the format you need.
From file to decision in three steps
No installation. No signup. No waiting for an upload.
Drop a file
Choose a G-code file from your slicer, SD card, or a message from a friend. It opens locally.
Understand it
See the toolpath by layer, check time and material, and catch obvious problems before you print.
Use it
Export a report, convert the format, or take the numbers into your cost calculation.
Questions, answered
Are my files uploaded?
No. Parsing, analysis, and conversion all happen in your browser. The site only serves the application files; your G-code never leaves your device.
Which formats can I open?
Plain G-code (.gcode, .gco, .g, .nc, .ngc, .tap, .txt), gzip-compressed G-code (.gcode.gz), Prusa binary G-code (.bgcode), and sliced 3MF files from Bambu Studio or OrcaSlicer (.gcode.3mf).
How accurate is the print time?
When the slicer embedded its own estimate, we show it first. Otherwise we calculate an idealized time from the moves and feed rates. Real time also depends on acceleration, firmware planning, and cooling.
Does it work on a phone?
Yes. The interface is responsive and supports touch. Large files are best handled on a desktop browser with enough memory.
Is it free?
Yes. The tools are free to use and do not require an account.
Ready to look inside your G-code?
Drop a file and get answers in seconds. Nothing is uploaded.