Video Editor — Crop, Trim & Merge
Crop MP4/WebM videos to Square, 9:16, or 16:9, trim a clip down to just the part you need, and merge two or more clips into one final video — all in three tabs, entirely in your browser.
Drag & drop an MP4 or WebM video here, or click to browse
Up to 100MB. Drag the crop box over the live preview, pick an aspect ratio, then export.
This Video Editor packs three related workflows into one tool: Crop, to drag a rectangle over a live preview and export just that region as a 9:16, 1:1, or 16:9 clip; Trim, to drag two handles on a timeline and shorten a video down to just the part you need; and Merge, to reorder two or more clips and combine them into a single final video.
Like every tool in this suite, all three run entirely client-side: source video plays once in the background while the relevant frames are drawn onto a canvas and recorded with the browser's MediaRecorder API — nothing is uploaded anywhere.
How to use the Video Editor
- 1
Pick a tab
Crop for reframing to a different aspect ratio, Trim to shorten a single clip's start/end, or Merge to combine several clips into one video, in order.
- 2
Upload your video(s)
Drag an MP4 or WebM file (up to 100MB each) onto the drop zone. Merge accepts multiple files at once; Crop and Trim work on one video at a time.
- 3
Adjust
In Crop, drag the box and pick an aspect ratio. In Trim, drag the start/end handles on the timeline below the preview. In Merge, drag rows (or use the arrow buttons) to set the final clip order.
- 4
Export and download
Click the tab's export button. The source plays through once while the result is recorded, then a download button appears with the finished file.
Why convert in your browser instead of uploading to a server?
Three workflows, one tool
Crop, trim, and merge cover the most common quick edits — reframe, shorten, combine — without switching between separate apps.
Real-time visual controls
The crop box, the trim handles, and the merge order are all manipulated directly on top of the video or its file list, instead of entering numbers blind.
Fully local processing
Every frame draw and recording step happens with browser-native Canvas, Web Audio, and MediaRecorder APIs — your footage never leaves your device.
Honest format disclosure
The tool tells you upfront which output format your specific browser will produce, rather than assuming MP4 everywhere.
Frequently asked questions
How is Trim different from Crop?+
Crop changes the video's frame — cutting away the edges of the picture. Trim changes the video's length — cutting away time from the start and/or end, so a 1-minute video can become a 30-second one without touching the frame itself.
How many clips can I merge at once?+
There's no hard cap — add as many as you like, each up to 100MB, then drag them into the order you want before merging.
My clips have different resolutions — what happens when I merge them?+
The output canvas uses the first clip's aspect ratio (adjustable via the resolution presets). Every other clip is scaled to fit inside that frame with black letterbox bars rather than being stretched or cropped.
Can I reorder clips by dragging, not just with buttons?+
Yes — each row in the Merge tab is a native drag handle; drop it on another row to swap its position. The up/down arrow buttons do the same thing for precise, click-based reordering.
Why is the output a .webm file?+
The same browser limitation as the Video Compressor: MediaRecorder in most Chrome and Firefox builds only encodes to WebM, not MP4, without a heavy WASM transcoder. The tool shows the actual format your browser supports before you export.
Will my audio be kept?+
If 'keep audio' is checked and your browser supports capturing it, yes — in Merge, each clip's own audio plays during its own segment of the final video. If capture isn't supported, the export falls back to video-only automatically instead of failing.
Is there a limit on video length?+
No explicit duration cap, only the 100MB per-file size limit — since every operation here plays video in real time to record it, longer or more numerous clips simply take longer to process.
Reframe with Crop, shorten with Trim, or combine with Merge — three of the most common quick video edits, each with a direct visual control and an exact readout of what you're about to export.
As with the Video Compressor, the actual output container depends on what your browser's MediaRecorder supports — that's disclosed directly in the tool rather than glossed over.