TrimzioCore editing stays on your computeror
or
Nothing is uploaded. The file is read directly from your disk and never leaves this computer.
Choose a format before opening a video or change it at any time while editing. Existing clips and overlays stay in the project.
Automatic mode balances speed and stability. Long videos stream directly to your chosen file so memory stays bounded.
Encoding your edit. Keep this tab visible for best results.
Long exports may take several minutes. You can cancel safely at any time.
Preferences are saved in this browser only, on this computer.
Keeps a .trimzio project file on your computer up to date automatically, so you never lose progress. Each save rewrites the whole file (video included), so it runs on the interval below rather than continuously.
Videos / Trimzio
By default, projects are saved in a Trimzio folder inside your Videos folder, created for you the first time you autosave. Click Change to pick a different folder (on macOS this opens your Movies folder). Available in Chrome and Edge on Windows and Mac; Safari and Firefox can't auto-save to a folder, so use Save project there instead.
Trimzio was opened directly from a file, so your browser will not remember this folder and will ask for it again every time you open the app. To fix it, close this tab and start Trimzio with Start Trimzio.cmd (in the Trimzio folder) instead. It opens the same app at localhost, where the folder and its permission stick.
Used to pre-fill the export dialog.
Core editing is always local. Local-only mode additionally blocks cloud AI chat and transcription requests. Turn it off only when you choose to use those optional services; transcription will still ask before sending audio to the named provider.
Diagnostic reports contain browser capabilities, feature counts, and error categories only. They never include filenames, media, captions, transcript text, or project content.
A quick guide to editing in Trimzio. Core editing stays on your computer; optional cloud features are clearly labeled.
Move the playhead and press S to split the video into clips. Then work directly on the timeline: drag a clip to rearrange it, drag its edges to trim (or extend it back out), double-click to remove it, right-click for more actions. Removed clips disappear from the timeline; undo brings them back.
Use + Add clip (or drop more video files onto the window) to append other videos to the timeline; each clip remembers which file it came from. Hover the timeline and click a + at any clip edge to insert a video right there instead of at the end.
To work on several things at once, drag a box across the timeline starting from empty lane space (hold Shift to start the box anywhere, even on top of a clip). Everything the box touches is selected: clips, overlays, captions and audio tracks. Then delete, copy, duplicate or drag the whole group together, or Ctrl+click to add and remove individual items.
Add text, a local image (logo, sticker) or a picture-in-picture video with the Text, Image and PiP buttons in the toolbar on the left, then drag it into place directly on the preview. Each overlay has its own timing, shown as a bar under the timeline. Select an overlay and use the arrow keys to nudge it; Ctrl+C / Ctrl+V to copy and paste it.
Use Canvas in the top bar before opening a video or at any time while editing. Choose a preset such as 16:9, 9:16, 1:1, 4:5 or 21:9, or enter an exact custom width and height. You can also choose whether clips fill the canvas or fit inside it.
The Clip tab edits one clip at a time (motion, speed, volume, noise cancellation): the clip you selected, or the one under the playhead. The Audio tab holds music, sound effects, voiceover, the free sound library and the master volume. The Effects tab has color looks, style and crop. Everything is applied live to the preview and baked into the export.