Identify what prevents you using the file
Start with the actual obstacle: too many megabytes, excessive dimensions, a required frame rate or an unsupported destination format. Video information displays duration, dimensions, codecs and an average bitrate calculated for the file. Record those values alongside the original size so you can compare results. The extension describes the container rather than the entire track combination. Renaming mp4 to webm does not convert the contents. Choose one operation and test its output before combining several transformations, because repeated processing can compress the picture again and make it harder to identify which change caused a problem.
Compress with a reduction you can verify
Compress video offers light, balanced and maximum levels, plus an optional maximum resolution. Stronger compression can remove detail, create blocks or affect noisy backgrounds; final size also depends on movement in the recording. If the result is not smaller than the original, the tool explains that no download is offered and you can try another combination. It does not promise an exact megabyte target. Examine small lettering, faces and movement as well as file size. Repeatedly processing an already compressed file can worsen its appearance without producing a useful saving.
Reduce dimensions while preserving proportions
Change resolution reduces the shorter side to the selected setting and adjusts the other side to preserve the aspect ratio. Codecs require even dimensions, so a small rounding difference is possible. In the 480 by 270 pixel sample, selecting 240p produces 426 by 240. A portrait recording is also calculated from its shorter side; the operation does not turn it into landscape. This tool reduces size and rejects enlargement when a video already has the selected resolution or less. To change the frame’s shape, use Crop video, which removes part of the picture.
480 × 270 → 426 × 240 30 FPS → 15 FPS
Adjust FPS without changing playback speed
Change frame rate accepts one to sixty frames per second, including decimals such as 29.97. It keeps duration and audio: changing thirty to fifteen does not make the recording play twice as fast. Frames are dropped when lowering the rate and repeated when raising it, without inventing intermediate motion. Movement can become less smooth, particularly during rapid pans or action. Do not assume that lowering FPS always creates a smaller file under every set of settings. Use it when you need a particular rate and compare the resulting motion with the original recording.
Convert and test at the actual destination
Convert video offers MP4, WebM, MOV and MKV. Compatible tracks may be copied; when re-encoding is necessary, the available codecs depend on what the browser can produce. Changing containers alone guarantees neither a smaller file nor compatibility with every application. Test the downloaded output on the device or platform that will receive it and listen to all the audio. Keep a high-quality source and create delivery versions from it. Processing stays on your device and the input limit is 500 MB; leave the browser tab open while longer jobs complete.
Two independent changes you can measure
Download the sample MP4. In Change resolution, choose 240p, process and save the result, then inspect its properties. Return to the original for the second experiment: in Change frame rate, enter 15, process and inspect the output rate. Do not use the reduced copy for this comparison because that would combine two changes. Finally, try Compress video with maximum compression and 240p to compare its byte count with the original.
480 × 270 → 426 × 240 30 FPS → 15 FPS
The resolution output measures 426 by 240 pixels. The frame-rate output has 15 FPS and retains roughly six seconds of duration with audio.
Check file size from your saved files and movement in the destination player. This exercise describes this particular sample rather than a guaranteed saving for every recording. If a codec is unavailable, read the message and try a format that the browser supports.