There is no upload step
Your browser reads the file and uses the video encoder on this device. Neither the source nor the result is sent to our servers.
Processed only on this device
Compress video online free — private, no upload
Free video compressor to compress video size in your browser. Compress video to 10MB or 25MB, compress video for WhatsApp, or follow how to compress a video on iPhone in Safari. Your file never uploads.
Compress video free · No sign-in · No upload · No watermark
Compression settings
LOCAL / 01Know the limit? Type the size.
Email, chat, and upload forms have hard limits. Enter the target MB instead of guessing with a quality slider.
Device safety comes before speed
Hardware encoding is preferred. Compatibility mode is used when needed, with stricter limits for large files.
Video compression explained
What happens when you compress a video?
Video file size is driven mainly by duration, bitrate, resolution, frame rate, and audio. A compressor re-encodes the picture with less data and can optionally lower the resolution, producing a smaller file that is easier to send, upload, and store.
This tool reads the source video, calculates a suitable bitrate for your quality choice or target MB, and creates an MP4 or WebM in the current browser. The video never needs to travel to a remote server.
What controls video file size
Bitrate
Fewer bits per second create a smaller file. Bitrate is usually the biggest size control.
Resolution
Scaling 4K or 1080p down means fewer pixels need to be encoded in every frame.
Scene complexity
Fast motion, grain, and fine detail need more data to stay visually clean.
Audio
For silent clips, removing the audio track can reduce the output a little further.
Compression options
Choose how to compress your video
Start with Balanced when you are unsure. To compress video to 10MB or 25MB, or to compress video size for WhatsApp and upload forms, use Exact size and enter the MB you need.
| Mode | What it does | Best for |
|---|---|---|
| High quality | Uses a lighter bitrate reduction to preserve texture and motion detail | Presentations, portfolios, and large screens |
| Balanced | Trades some bitrate for a practical balance of clarity and size | Email, chat, and cloud uploads |
| Small file | Reduces bitrate more aggressively to prioritize a compact result | Quick previews, small attachments, and slow connections |
| Exact size | Calculates bitrate from duration and aims for the MB you enter | Application forms, learning platforms, and upload caps |
Local compression in three steps
- 01
Choose a video
The browser reads its details without uploading it.
- 02
Pick the size
Choose a quality preset or enter the MB you need.
- 03
Download
Review the result size and save it directly.
Made for everyday limits
Compress video size for every destination
Smaller videos transfer faster, use less storage, and are easier to fit under platform limits—whether you need to compress video to 10MB, compress video to 25MB, or compress video for WhatsApp.
Compress video to 10MB or 25MB
01Use Exact size, enter 10 or 25, and shrink clips to common upload caps.
Compress video for WhatsApp
02Reduce phone clips and screen recordings so WhatsApp and chat apps send faster.
How to compress a video on iPhone
03Open this free video compressor in Safari, choose a short clip, and download the smaller file—no app install.
Email attachments
04Enter the target MB allowed by your mail provider instead of switching to a cloud link.
Social media uploads
05Control quality and resolution before uploading to reduce waiting time.
Courses and forms
06Aim for the file limit used by an LMS, application form, or submission portal.
Formats and limits
Video formats, output, and browser limits
Check these details before you start. Actual encoding support depends on your browser and device hardware.
- Input formats
- MP4, MOV, M4V, WebM, and MKV
- Output
- H.264/AAC MP4 when supported; VP9/Opus WebM as a device fallback
- File size
- Up to 500 MB; compatibility mode is limited to 200 MB
- Resolution
- Keep the original size or limit output to 1080p, 720p, or 480p
- Compression control
- High, Balanced, Small, or an exact target size in MB
- Privacy
- Local reading, encoding, and download; no video upload to our servers
Quality guide
How to compress video without losing too much quality
Video compression is normally lossy, but the right settings can keep the difference hard to notice in normal viewing.
- 01
Start from the original
Do not repeatedly compress an already compressed file; each new encode removes more detail.
- 02
Try Balanced first
It is a practical starting point for email, chat, and web uploads. Adjust after previewing the result.
- 03
Lower resolution only when useful
If the video will be watched on a phone or in a small web player, 720p may be enough.
- 04
Keep audio when it matters
Remove the audio track only when the clip is meant to be silent.
- 05
Keep your original file
Download and review the compressed result before deciding whether to remove the source.
Continue working with your video
Use these related tools to extract audio, create captions, or improve your video.
Extract audio from video
Save the sound from a video as a separate audio file.
→Online subtitle editor
Create, review, and export captions in your browser.
→AI video upscaler
Upscale lower-resolution video for a clearer viewing result.
→Remove background music
Separate speech from background music for cleaner audio.
→Frequently asked questions
How do I compress video free online?
On aicompressvideo.com, choose an MP4, MOV, M4V, WebM, or MKV file. Pick a quality preset or exact size, optionally limit resolution, then select Compress video. This free video compressor finishes locally so you can download right away.
Can I compress video to 10MB or 25MB?
Yes. Switch to Exact size and enter 10 or 25. The tool calculates bitrate from duration and keeps a safety margin; complex footage can make the final size vary slightly.
How do I compress video for WhatsApp?
Choose your clip, then use Exact size or the Small preset to compress video size for faster WhatsApp sending. Processing stays in your browser.
How to compress a video on iPhone?
Open aicompressvideo.com in Safari, pick a short clip, compress it, and download the result. For long or large videos, a computer is more reliable.
Is my video really never uploaded?
Yes. Reading, decoding, encoding, and file creation happen in this browser. Compatibility mode only downloads its processing code on first use.
Which video formats can I compress?
You can open MP4, MOV, M4V, WebM, and MKV files. The result is H.264/AAC MP4 when your browser supports it, with VP9/Opus WebM available as a fallback.
Can I compress video without losing quality?
A meaningful size reduction normally requires lossy re-encoding. Start with High or Balanced and keep the original resolution; the difference is often hard to notice during normal playback.
What is the maximum video file size?
The file limit is 500 MB. If your browser needs compatibility mode, the limit is 200 MB to reduce the risk of running out of memory or crashing the page.
Why is the result size an estimate?
Encoders spend more data on complex scenes, so a single pass cannot guarantee every byte. Exact-size mode keeps a small safety margin.
Processed only on this device
Compress video free · No sign-in · No upload · No watermark