Video Compressor Online — Free, No Upload

How to compress a video online

Choose a video. Select one video from your device. MP4, MOV, MKV, WebM and AVI are accepted when the browser or fallback can decode the file.
Choose quality or a size target. Start with Balanced for a smaller MP4, or choose To a file size and enter your limit. Select 720p or 480p if you need a smaller frame.
Compress and check the result. Click Compress video. Check the actual output size, then open the comparison to play the original and compressed video before downloading.

The tool tries WebCodecs, then a MediaRecorder-based real-time encoder, then FFmpeg in WebAssembly. Browser support and clip length affect speed. The software path can download its encoder before starting.

Compress a video to 10 MB, 25 MB or a custom target

Choose To a file size and pick 10 MB, 20 MB, 25 MB or another target. The estimate uses your clip length and reserves space for audio and the MP4 container. If a pass is too large, the encoder can retry at a lower bitrate.

Enforce upload limit is on by default in size mode. It counts 1,000,000 bytes per MB and offers a download only when the finished MP4 fits. If it still exceeds the cap, shorten the clip, lower the resolution or remove audio. Uncheck the option for the previous binary target scale (1,048,576 bytes per displayed MB) and the option to download an over-target result.

Supported formats and controls

Formats, settings and limits of this browser compressor.

Capability	Supported	Detail
Input
MP4, MOV, MKV, WebM, AVI, M4V	Yes	Codec support depends on the browser and available encoder.
File size limit	No	No fixed server quota. Device memory and browser limits apply.
Long clips	Yes	Long clips depend on device memory, codec support and encoding speed.
Several videos at once	No	One clip at a time; the encoder wants the whole device.
Controls
Target file size	Yes	Name a size and the output is measured against it.
Quality levels	Yes	Light, Balanced, Strong, Extreme.
Resolution downscale	Yes	1080p, 720p or 480p, or keep the original.
Remove the audio track	Yes	A checkbox; useful when a target is tight.
Compress more	Yes	One more real step on the same clip, after a weak result.
Trimming	No	Use our video trimmer first, then compress.
Frame rate control	No	The tool chooses how to handle frame rate.
Crop, rotate or filters	No	Use a separate editor for cropping, rotation or filters.
Output
MP4, H.264 video, AAC audio	Yes	H.264 MP4 output with AAC where audio is supported.
Guaranteed smaller output	No	Results depend on the source and encoder. Compare the displayed sizes.
WebM, AV1, HEVC or GIF out	No	The compressor produces H.264 in MP4.
Watermark	No	Nothing is added to the picture.
How it runs
Nothing is uploaded	Yes	The clip is encoded on your device and never sent anywhere.
Signup or daily limit	No	There is no account and no quota.
Offline use	No	The page loads from the network; the software fallback also fetches an engine.
API	No	This is a page, not a service.

Compress video for Discord, WhatsApp or email

Where	What to check	How to start
Discord	Discord documents 20 MB for non-Nitro users and mentions experiments. Check your account.	Try a 10 MB target if you need a smaller file, or set a target below the cap you see.
WhatsApp	Check the limit for sending as a video or a document.	Choose a target below the cap for the send method you’ll use.
Email	Personal Gmail allows 25 MB of attachments. Other providers and work accounts can differ.	Leave room for other attachments. Check the finished file before sending.

Platform guidance checked 5 November 2026. See the guides for Discord video compression, WhatsApp video compression and email attachments.

Reduce video file size while keeping detail

Try Light with Original resolution when detail matters. Balanced is a starting point for sharing. Strong and Extreme can reduce detail, especially on fast motion, small text and textured backgrounds.

Lower the resolution to 720p or 480p when you have a tight limit. Shorten unused footage with the video trimmer or remove audio if you don’t need it. Compare the actual size and play the result before sending.

Measured compression examples

We encoded three synthetic 8-second MP4 clips in Chromium using this tool’s FFmpeg software fallback. The table reports the actual downloaded bytes. These results depend on the source clip and encoder.

Example	Settings	Original	Compressed
Portrait camera-style clip	Strict 1 MB, 480p	4,124,031 bytes 540 × 960	926,720 bytes 270 × 480
Screen-style clip with text	Balanced, original resolution	223,901 bytes 1280 × 720	52,679 bytes 1280 × 720
Fast-motion clip	Strict 2 MB, 480p	8,789,009 bytes 1280 × 720	1,915,622 bytes 854 × 480

Compress video without uploading it

Your video is processed in the browser and the MP4 is created on your device. The page, analytics and ads can use the network, and the software encoder can require a download.

For long clips, a desktop encoder such as HandBrake can give you more control over codecs and rate settings. This tool is for quick browser compression with quality and target-size controls.

Frequently asked questions

Choose To a file size, select a preset or enter a custom limit, then compress. Enforce upload limit compares the finished MP4 with the exact byte cap. If it is over, try a shorter clip, lower resolution or less audio.

Add a clip, choose To a file size and select 10 MB or 25 MB. Enforce upload limit uses 1,000,000 bytes per MB. Check the limit for the service and account you plan to use before choosing a target.

Savings depend on duration, content, resolution and the source bitrate. A clip that has already been compressed may shrink very little at the same resolution. Check the estimate and compare the actual result.

Re-encoding can change visual detail. Start with Light and the original resolution to prioritise quality. For a tighter target, trim the clip first or lower the resolution and inspect the output.

No. Compression runs in your browser. The site can download the encoder and other page resources, but the compression workflow does not send your video to a conversion server.

Check the upload limit shown for your Discord account, then choose a target below it. Discord documents 20 MB for non-Nitro users and says it experiments with different limits. Play the result before sharing.

Short clips are easier to compress on phones and laptops. Available memory, browser support and the video’s codec affect which files can finish. Trim a long clip into a smaller segment if it stalls.

The picker accepts MP4, MOV, MKV, WebM, AVI and M4V. The codec inside the file still matters. If your browser cannot decode it, the tool can try a software fallback for supported codecs.

The tool exports MP4 with H.264 video. When the selected encoder can include sound, it uses AAC audio. You can remove the audio track when you need a smaller silent clip.

Time varies by clip length, device and encoder. The fast path uses WebCodecs when available, the real-time path follows playback, and the software fallback can take longer.

The tool tries WebCodecs first. It can fall back to a MediaRecorder-based path or FFmpeg running in WebAssembly. The engine note under the compression controls describes the path.

Try Compress more, select 720p or 480p, or trim unused footage with the video trimmer. If sound is optional, remove the audio track. Check the actual output before attaching it.

Try a short video in a current mobile browser. Codec support and memory vary by device, and longer clips can be slow. Keep the tab open and use 720p or a shorter clip if needed.

Check the size limit for the send method and account you plan to use. Aim below that limit, verify the result and attach the downloaded MP4. Use a shorter clip if the file still exceeds the cap.

Yes. The page and any required software encoder load over the network. Once loaded, the encoding runs on the device without uploading the clip to a conversion server.

This tool processes one video at a time. Download your result, then choose a different video. For long footage, trim the part you want to share before compressing it.

Compress Video Online