Cast/edit/or

A browser-based editor for asciinema recordings (.cast files). 100% client-side — no server, no uploads, your files never leave the browser.

Features

Trim — keep only a time range
Cut — remove a time range
Speed — change playback speed globally or within a selection
Remove Idle — cap long pauses to a maximum gap
Add Idle — insert a pause of chosen duration at the playhead position
Normalize Input — even out keystroke timing (recorded with --stdin option)
Resize — change terminal dimensions
Replace Text — find and replace text in output events
Theme — pick from 12 built-in terminal color themes (asciinema, catppuccin variants, dracula, gruvbox-dark, monokai, nord, solarized-dark/light, tango); theme is stored in the cast header and applied to both the live preview and SVG export
Undo / Redo — full history (Ctrl+Z / Ctrl+Y)
Export — download as asciicast v2 or animated SVG (with window chrome and cursor options)
Snapshot — export a single frame at the current playhead position as a static SVG or PNG
Load Sample — try the editor instantly with a built-in example recording
Tool options (idle threshold, idle length, key interval) are remembered across sessions via localStorage

brew install asciinema
Follow the directions here: https://docs.asciinema.org/getting-started/
Format must be asciicast-v2
Be sure to use the --stdin option if you want the user input to be captured and be able to use the Normalize Input feature
Example: asciinema record --output-format asciicast-v2 --overwrite --stdin my_nice.cast

npm install
npm run dev

Open http://localhost:5173, then drag and drop a .cast file onto the page.

npm run build   # outputs to dist/