Choose the part to use Drag the two handles. Leave them at the ends to keep the whole video.
Settings
Getting ready…
Everything runs on your device. Nothing is uploaded.
- 1. Load tools
- 2. Read video
- 3. Process
- 4. Ready
Your video stays on your device. It is processed inside your browser and is never uploaded to our server.
How to convert a video
- Choose a video or drag it onto the box. MP4, MOV, WebM, MKV and MPEG-TS files work.
- Check the details on the right: length, resolution, video codec and sound.
- Pick a preset, or set the output format, resolution, quality and frame rate yourself.
- To keep only part of the video, drag the two handles under the preview.
- Press Convert video. The ring shows the progress, the preview shows which part is being processed, and the timer tells you how long is left.
- Play the result in the page, then download it.
Which format should you choose?
| Format | Best for | Notes |
|---|---|---|
| MP4 (H.264) | Phones, WhatsApp, Instagram, YouTube, TVs, email | The safest choice. Almost every device and app can play it. |
| WebM (VP9) | Websites and web apps | Smaller than MP4 at the same quality in many cases. Older iPhones and some TVs cannot play it. |
| MOV | iMovie, Final Cut and other Apple apps | The same streams as MP4 in Apple's container. |
| MKV | Archiving and media players like VLC or Plex | Holds almost any codec. Many phones and browsers will not preview it. |
What the settings do
Resolution
Resolution sets the size of the picture. The tool measures the shorter side, so 720p means 1280 × 720 for a landscape video and 720 × 1280 for a portrait phone video. It never makes a video bigger than the original. Dropping from 1080p to 720p usually cuts the file to around half, and most people will not notice the difference on a phone screen.
Quality
Keep original is the fastest option. If your video is already H.264 and you are only changing the container or cutting a part, the frames are copied without re-encoding, so nothing is lost. High, Medium, Low and Smallest re-encode the video at lower bitrates. Medium is a good balance for sharing. Low and Smallest are useful when a website or exam portal has a strict upload limit.
Frame rate and sound
Lowering the frame rate from 60 to 30 fps saves space and is hard to see in most clips. Screen recordings and slideshows still look fine at 15 fps. Remove sound gives you a silent video, which also makes the file a little smaller.
Tips for faster, smaller conversions
- Cut the clip first. Converting 30 seconds is much quicker than converting 10 minutes.
- For WhatsApp and other chats, the 720p Medium preset gives a small file that still looks sharp on a phone.
- Re-encoding is the slow part. On a recent laptop, a short HD clip often processes faster than real time. Phones and older computers are slower.
- Keep the tab open and the screen on while it works. Some phones pause background tabs.
What it can and cannot open
The converter reads MP4, MOV, M4V, WebM, MKV and MPEG-TS files. It can only decode codecs your browser supports. H.264, VP8, VP9 and AV1 work in current Chrome, Edge and Firefox. iPhone videos recorded in HEVC (H.265) open in Safari, and in Chrome or Edge on computers with HEVC support. Old formats like AVI, WMV and FLV cannot be read in a browser at all, so the tool tells you straight away instead of failing halfway.
The finished file is held in your device's memory before you download it. Very long or 4K videos can run out of memory on phones and older computers. If that happens, convert a shorter part or choose a lower resolution.
Common uses
- Turn an iPhone MOV into an MP4 that plays on Windows and Android.
- Shrink a video to fit an email, a college portal or a job application form.
- Convert a WebM screen recording to MP4 for PowerPoint or WhatsApp.
- Make a lighter 480p copy of a long lecture to save phone storage.
Privacy
Your video never leaves your device. The converter code downloads from the jsDelivr CDN the first time you use it, and from then on the work happens inside your browser tab. Nothing is sent to ToolsRiver, and we cannot see your files. When you close the tab, the copies held in memory are gone.
Frequently asked questions
Is this video converter free?
Yes. There is no sign-up, no watermark and no limit on the number of videos.
Is there a file size limit?
There is no fixed limit, because the file is not uploaded. The practical limit is your device's memory. Files of a few hundred MB work well on most computers.
Will converting reduce the quality?
With Keep original and the same codec, the video is copied without any quality loss. Any setting that re-encodes the video loses a little detail, which is how all video compression works.
Why does the MP4 I made have Opus sound instead of AAC?
Some browsers, including Chrome on Linux, cannot create AAC audio. When your video already has AAC sound, the tool copies it unchanged. Otherwise it uses Opus, which plays in modern browsers, Android and VLC. On Windows and Mac you will normally get AAC.
Can I convert a video to MP3?
Yes, use Extract Audio from Video. It saves the sound as MP3, M4A, WAV or OGG.
Does it work on a phone?
Yes, in recent versions of Chrome, Safari and Firefox. It is slower than on a computer, and long videos may need to be cut into shorter parts.