MP4
Most compatible. Plays everywhere.
Drop video files here or click to browse
Files queue into the current batch until you convert · MP4, MOV, MKV, WebM, M4V
Supported formats
Convert any supported format into any other supported format, depending on browser codec support.
MOV
Common for Apple devices and editors.
MKV
Flexible container, multiple tracks.
WebM
Open, web-friendly, smaller files.
How to convert multiple videos at once in your browser
01
Add your videos
Drag and drop video files into the converter, or click to pick them from your computer.
02
Choose output settings
Pick the output format (MP4, MOV, MKV or WebM), quality, optional width, and whether to remove audio.
03
Convert in bulk
Click Convert files. Each video is processed locally on your device, one after another.
04
Download results
Download files individually, or grab the whole batch as a single ZIP.
Who it's for
Anyone with a folder full of videos
Phone clips, screen recordings, drone footage, camera exports. If you have many video files and want to convert or compress them quickly without installing software, this tool is built for you.
People who care about privacy
Files are processed in your browser and stay on your device. They are not uploaded to a server. Useful when you would rather not hand personal or work footage to a third-party converter.
Developers and editors
A simple alternative to the command line for the most common batch jobs: format conversion, resizing for the web, removing audio, and quick compression before sharing.
Mac, Windows, Linux, Chromebook
Nothing to install. Exact output support varies by browser, operating system, and available codecs; WebM is often the broadest path when AAC encoding is unavailable.
Common use cases
- Convert many MOV clips from an iPhone or camera to MP4.
- Compress large videos before sharing them over email or chat.
- Convert WebM or MKV recordings to a more compatible format like MP4.
- Strip audio from a batch of clips to use as silent background loops.
- Resize a folder of videos to a specific width before publishing on the web.
- Reformat OBS or screen-recording captures for clients or stakeholders.
Browser-based vs cloud-based
Most online video converters upload your files to a server, convert them remotely, and stream the result back. That works, but it puts your files on someone else’s machine, often with file size or batch limits and slow uploads on home internet.
This tool runs locally in your browser instead of uploading files to a conversion server. There is no server-side queue, and performance depends mainly on your device, browser, and source files.
Troubleshooting
A file failed to convert
Some files use codecs your browser cannot decode. Try a different output format, switch to another browser (Chrome and Edge generally support the widest range of codecs today), or update your current browser.
Browser support varies
The tool relies on WebCodecs, but API availability does not guarantee every codec. MP4, MOV, and MKV output need H.264 plus AAC; WebM needs VP9 plus Opus. Recent desktop Chrome or Edge, or Safari 26+, provide the widest support.
Very large files take longer
Multi-GB files and long batches need available memory and disk space on your device. If a single huge file struggles, try lowering the output width, splitting the file, or processing it on a machine with more RAM.
My computer slows down on big batches
Encoding is CPU and (when available) GPU intensive. For very large batches, process the files in smaller groups and close other heavy tabs while the queue is running.
Output looks too low quality
Increase the quality setting or remove the width override. Lower quality settings are intended for size reduction and quick previews, not for archive.
Frequently Asked Questions
Are my processed videos safe and private?
Your video files are processed directly in the browser on your device. There is no upload endpoint for video, so the file itself is not sent to any server. Loading the page still involves normal web traffic (HTML, CSS, JavaScript, and anonymized analytics), but the video bytes stay local.
Can I batch convert videos?
Yes, you can batch convert videos. Add multiple files and process them in one queue. Performance and practical batch size depend on your device, browser, available storage, and source files. If you want different output formats or settings for different files, start a new queue once the first batch finishes.
How do I convert multiple videos at once?
Drop or select your video files in the converter, choose your preferred output format, quality and width, click "Convert files" to process all files in bulk, then download the converted videos directly to your device, either one by one or all at once as a .zip file.
Which formats are supported?
MP4, MOV, MKV, and WebM are supported as both input and output formats. The picker also accepts .m4v inputs (treated as MP4).
Compression vs conversion, what is the difference?
Conversion changes the file’s container or codec, for example MOV to MP4, so the video plays correctly on more devices and platforms. Compression reduces file size by lowering the quality setting and/or output width, useful when you need to share, upload, or store files more efficiently. Both can be done in the same pass.
Does this work on Mac, Windows and Linux?
The tool runs locally on Mac, Windows, Linux, and ChromeOS when the browser can encode the selected output codecs. Support is output-specific: desktop Linux browsers lack native AAC encoding, so WebM output or removing audio may work where MP4, MOV, or MKV with audio does not.
Which browsers does this work in?
Conversion requires WebCodecs video encoding and decoding, but each browser and device supports a different codec subset. MP4, MOV, and MKV output use H.264 video with AAC audio; Firefox and desktop Linux browsers do not natively encode AAC. Safari 16.4 added video WebCodecs, while Safari 26 added audio encoding and decoding. WebM output uses VP9 with Opus and may work where AAC output does not. For the widest support, use a recent desktop Chrome or Edge release, or Safari 26+. The converter still validates the actual source and output codec configuration when a job starts.
Sources: MDN: WebCodecs API · MDN: WebCodecs codec selection · WebKit: WebCodecs video support in Safari 16.4 · WebKit: WebCodecs audio support in Safari 26 · Mediabunny: supported formats and codecs · Reviewed 2026-10-12
Is there a file size or batch size limit?
There is no server-side limit. Very large files and long batches depend on your device’s available memory and storage.
What works best in this tool?
Common consumer formats (MP4, MOV, MKV, WebM), reasonable batch sizes for your device, and a recent desktop browser. For unusual codecs, two-pass encoding, custom filtergraphs, or scripted pipelines, FFmpeg is usually the better tool.
Why did you make this tool?
As a web developer, I often needed a simple way to convert and compress multiple videos at once. I could not find a tool that felt fast, simple, and privacy-friendly, so I built one.