Video File Generator
Generate test video files in multiple formats with precise size control.
✓MP4 • Gradient • Max 2000 MB
Playable in all major video players and browsers
Video
Audio
Image
Document
Test Video File Generator
Create playable test videos with the size, duration and resolution you need. Pick a format, set the size and duration, and generate.
What's in a Generated Video
Each file is a real, playable video encoded with FFmpeg directly in your browser. It shows a test pattern for the duration you set: a colorful gradient by default, or broadcast-style color bars or a focus pattern from the advanced options.
Videos have no audio track. Keep that in mind if your test needs to check sound, audio codecs or audio-only processing.
Size, Duration and Resolution
- Target size from 0.001 MB to 2,000 MB.
- Duration from 1 second to 3,600 seconds (one hour).
- Resolution in advanced options: presets from 240p to 8K, vertical (9:16) and square, or a custom size up to 7,680 pixels. The default is Full HD (1920 × 1080).
- Frame rate in advanced options: 24, 25, 30, 60 or 120 FPS, or a custom value.
- Codec in advanced options: H.264 for MP4, MOV, AVI, MKV and FLV, and VP8 for WebM and MKV.
The video is encoded at a bitrate that fits the size you enter, then padded to exactly that many bytes. FileMock uses binary megabytes, so 1 MB = 1,048,576 bytes. For targets below 1 MB, the video is automatically limited to at most 640 × 480, 24 FPS and 10 seconds (less for tiny files) so it can still reach that size.
Common Uses for Test Videos
- Upload limits: check size and duration limits with files just under and over each limit.
- Transcoding pipelines: feed MP4, MOV, MKV and WebM files at different resolutions and frame rates into your processing jobs.
- Player compatibility: confirm which containers and codecs your player or platform accepts, including legacy AVI and FLV.
- Vertical video: test feeds and stories that expect 9:16 videos from phones.
- Performance: measure upload, storage and thumbnail generation with 4K and 8K files or files of several gigabytes.
Video Generator FAQ
Answers to common questions about generating test video files.
In the Video tab, enter the target size in MB and the duration in seconds, choose a format such as MP4 and click Generate. Encoding runs in your browser, and the file downloads automatically, named after its size and duration (for example video-20mb-30s.mp4).
Yes. They are real video files encoded with FFmpeg: H.264 in MP4, MOV, AVI, MKV and FLV, and VP8 in WebM. MP4 and WebM play in all major browsers. MOV, MKV, AVI and FLV play in common desktop players such as VLC, while browser support for those containers varies.
No. Generated videos contain a video track only. If you need to test audio, generate a separate audio file or use a video that includes sound.
It depends on the size, duration, resolution and your device. Small, short clips are usually ready within seconds, while long 4K or 8K videos and multi-gigabyte files can take several minutes because everything is encoded locally.
For target sizes below 1 MB, FileMock automatically limits the resolution, frame rate and duration, because a long full HD video can't be that small. Choose a size of 1 MB or more to keep your selected settings.
No. Videos are generated in your browser and saved directly to your device. Nothing is sent to FileMock's servers.