Trim WebM Video

How to Trim WebM Video

1. Upload Your WebM File — Click "Choose Files" or drag and drop your WebM video file.
2. Set Trim Points — Under the Trim section, select "Time Range" and enter a Start Time and Duration. You can specify times in seconds (e.g., 30.5) or in HH:MM:SS.sss format for frame-accurate cuts.
3. Adjust Video Quality (Optional) — Under File Compression, choose from: Quality Preset (Highest through Lowest), Target File Size % (1-100% slider with Smart Scaling), Specific File Size (MB/KB), Constant Bitrate, Variable Bitrate, Constant Quality (CRF), or Constraint Quality (CRF + max bitrate).
4. Change Codec (Optional) — Under Video Codec, the default for WebM is VP8 or VP9. Available codecs include VP8, VP9, AV1, H.264, H.265, and others. Under Audio Codec, the default is Opus. Available audio codecs include Opus, Vorbis, AAC, MP3, FLAC, and more.
5. Set Resolution (Optional) — Under Video Resolution, keep the original or choose Preset Resolutions (1080p, 720p, 480p, etc.), Fixed Resolutions, Resolution Percentage, or custom Width/Height.
6. Trim & Download — Click "Convert" to process. Download your trimmed WebM file instantly.

Why Trim WebM Video?

WebM is an open, royalty-free video format developed by Google, widely used for web video on platforms like YouTube, Reddit, and 4chan. Trimming WebM files is useful for cutting highlight clips from screen recordings, removing intros and outros from web videos, extracting specific scenes for social media posts, shortening clips to meet platform file size limits, and creating GIF-like short loops for messaging apps.

WebM Compression Options

Method	How It Works	Best For
Quality Preset	Automatic quality level (Highest→Lowest)	Quick trimming without manual tuning
Target File Size (%)	Slider from 1-100% of original size	Hitting a specific size reduction target
Specific File Size	Enter exact MB or KB target	Meeting upload limits (Discord 25 MB, etc.)
Constant Bitrate	Fixed bitrate throughout	Predictable file sizes
Constant Quality (CRF)	Quality-based encoding	Best quality-to-size ratio
Constraint Quality	CRF with max bitrate cap	Streaming with bandwidth limits

WebM vs MP4 for Trimmed Clips

Feature	WebM	MP4
Codec	VP8/VP9/AV1	H.264/H.265
License	Royalty-free	Patent-licensed
Browser support	Chrome, Firefox, Edge	All browsers
File size (same quality)	Smaller with VP9/AV1	Slightly larger with H.264
Best for	Web embedding, open platforms	Universal playback

Can I trim without re-encoding to keep original quality?

The tool re-encodes the trimmed segment, which allows you to change codec, resolution, and compression settings simultaneously. To preserve maximum quality, use the "Highest" Quality Preset or Constant Quality (CRF) with a low value. This produces output visually identical to the original.

What time format should I use for precise cuts?

You can enter times in plain seconds (e.g., 45.5) or switch to HH:MM:SS.sss format for longer videos. The HH:MM:SS.sss option is better for videos over a few minutes where you need to cut at an exact timestamp like 01:23:45.500.

Can I change the video codec while trimming?

Yes. Under Video Codec, you can switch from the default VP8/VP9 to AV1 (better compression), H.264 (wider compatibility), H.265, Theora, or other codecs. Similarly, under Audio Codec, you can switch from Opus to Vorbis, AAC, MP3, FLAC, or others.

How do I trim a WebM to fit Discord's 25 MB limit?

Under File Compression, select "Specific file size" and enter 25 MB. The tool automatically adjusts bitrate and resolution to hit your target. Alternatively, use Target File Size (%) and lower the percentage until the output is under 25 MB.

Can I trim and resize the video at the same time?

Yes. Set your trim points under Trim, then adjust Video Resolution to a smaller preset (720p, 480p, etc.) or enter a custom width/height. Both operations are applied in a single pass, which also helps reduce file size.