Prepare an upload
Compress a short clip and review the output size and quality before replacing the original.
Video tools
Online video compression, conversion, and subtitle extraction
Reduce video size, convert common containers, or extract an existing subtitle track as SRT. Compression and conversion default to native cloud processing, while subtitle extraction stays local by default. You can choose either mode before starting.
3 focused toolsBrowser-based processing
Choose your next step
Video tools in this toolbox
Video Compression
Compress MP4, MOV, AVI, MKV, and WebM videos online with bitrate, quality, and resolution controls for easier upload and sharing.
Input formats: MP4, AVI, MOV, MKV, WEBM
File limit: 50 MB · up to 2
Single-thread FFmpeg WASM in your browser
Video Format Conversion
Convert MP4, MOV, AVI, MKV, and WebM online when a platform, player, or editing workflow requires a different video format.
Input formats: MP4, AVI, MOV, MKV, WEBM, FLV, WMV
File limit: 50 MB · up to 2
Single-thread FFmpeg WASM in your browser
Subtitle Extraction
Extract existing embedded subtitle tracks from MP4, MKV, MOV, AVI, and WebM files, then export them as subtitle files such as SRT.
Input formats: MP4, AVI, MOV, MKV, WEBM
File limit: 50 MB · up to 2
Single-thread FFmpeg WASM in your browser
Choose the video operation that matches the source
Use video compression when an upload or message has a file-size limit. Use video conversion when a player, editing tool, or publishing platform needs another container such as MP4 or WebM. Re-encoding may change both picture quality and file size; a new extension alone does not guarantee compatibility.
Subtitle Extraction can export subtitle tracks already embedded in a video. It cannot create captions from spoken audio. If no subtitle track is present, use a transcription workflow instead of repeatedly trying to extract one.
Organized around real tasks
Common video workflows
Fix a format mismatch
Convert a supported source when the destination requires a different video container.
Reuse embedded subtitles
Extract an existing subtitle stream and save it as a separate subtitle file when the source contains one.
Before processing a video
Check the source
Confirm the extension, file size, and whether the video contains the track you need.
Choose a focused tool
Compress for smaller delivery, convert for container compatibility, or extract subtitles for an existing text track.
Keep the original
Compare playback, quality, and subtitle timing before using the new file elsewhere.
Video tool questions
Will video conversion preserve the original quality?
Not necessarily. Many conversions re-encode the video, which can change quality, size, codec, or playback compatibility. Keep the source until you have checked the result.
Can subtitle extraction create subtitles from speech?
No. It extracts an existing subtitle track. Speech-to-text transcription is a separate capability and is not part of this tool.
Why should I use a short video first?
A short sample lets you check quality and format compatibility before a longer job. Local mode uses device memory; cloud mode adds upload and queue time and limits source video to 50 MiB and 10 minutes.
Should I compress or convert a video?
Compress when the file is too large. Convert when the destination rejects the current container. Conversion alone may not reduce file size.