What is Video Compression?
Video compression shrinks large recordings — phone footage, camcorder files, screen captures — down to a size you can actually send or upload. Pick a resolution (1080p, 720p, 480p, 360p) and a strength (High Quality, Standard, Max), and the tool re-encodes your video with the efficient H.264 codec. You see an estimated output size before you start, and you can play the result right in the browser to check the quality before downloading.
The defining difference: your file is never uploaded. Travel videos, family clips, and meeting recordings stay on your device, and even multi-GB files start compressing instantly with no upload wait. There are no size limits, daily quotas, watermarks, or sign-ups — and the browser's hardware-accelerated encoder (WebCodecs) delivers speeds comparable to desktop software.
Key Features
No Upload, No Limits
Files never leave your device, and there are no size caps, quotas, or watermarks. Compress personal videos with confidence.
Resolution & Strength Control
Combine original/1080p/720p/480p/360p output with three strength levels to balance size against quality.
Size Estimate Preview
See the estimated output size before compressing, so you can dial in settings without trial and error.
Hardware-Accelerated Encoding
Uses the browser's built-in WebCodecs encoder with hardware acceleration, and lets you play the result immediately.
How to Use
- Add a video — Drag & drop or click to choose an MP4, MOV, WebM, or MKV file. Resolution and duration appear.
- Pick resolution & strength — 720p Standard suits most sharing. Watch the size estimate as you adjust.
- Compress — Hit Start Compression and follow the progress. Nothing is uploaded.
- Check & download — Play the compressed video to verify quality, then download. Not happy? Change settings and re-run.
Use Cases
Messenger Transfers
Compress long clips to 480–720p so they fit messenger limits with minimal visible quality loss.
Email & Assignment Submission
Fit presentation and assignment videos under the usual 25MB mail cap and attach them directly.
Free Up Storage
Re-encode 4K phone footage to 1080p Standard and reclaim multiple times the space on your phone or cloud.
Web & Community Uploads
Meet forum and blog upload limits and produce light videos that load fast for viewers.
Video Compression Reference
Approximate sizes by resolution and strength, transfer limits by channel, and the factors that determine video size.
Estimated Size by Resolution & Strength (10-minute video)
| Resolution | High Quality | Standard | Max Compression |
|---|---|---|---|
| 4K (2160p) | ≈ 1.2GB | ≈ 760MB | ≈ 460MB |
| QHD (1440p) | ≈ 690MB | ≈ 460MB | ≈ 270MB |
| FHD (1080p) | ≈ 390MB | ≈ 250MB | ≈ 145MB |
| HD (720p) | ≈ 220MB | ≈ 145MB | ≈ 85MB |
| SD (480p) | ≈ 115MB | ≈ 77MB | ≈ 51MB |
| 360p | ≈ 70MB | ≈ 47MB | ≈ 36MB |
Calculated for H.264 video + 128kbps audio. Actual results vary with motion and scene complexity.
Typical Transfer Limits by Channel
| Channel | Typical limit | Suggested setting |
|---|---|---|
| Messenger file transfer | Often ~300MB | 720p Standard for clips under 10 min |
| Messenger video send | Auto re-encoded (quality drops) | Pre-compress to 720p, send as a file |
| Email attachments (Gmail etc.) | Around 25MB | 480p Max + split long videos |
| Forums & communities | Tens to hundreds of MB | 720p Standard or 480p |
| Cloud sharing | Generous | Archive at 1080p High Quality |
Exact limits change with service policies — check each service's latest guidance.
The 3 Factors That Determine Video Size
| Factor | Effect on size | How this tool controls it |
|---|---|---|
| Bitrate | Most direct — data per second | Three strength levels |
| Resolution | More pixels need more bitrate | 1080p–360p presets |
| Duration | Size = bitrate × length | (Trim beforehand with an editor if needed) |
| Audio | ≈ 1MB per minute at 128kbps | Auto-optimized to AAC 128kbps |
High-motion footage (sports, gaming) needs more bitrate at the same settings, so quality loss shows earlier.
Frequently Asked Questions
Is my video uploaded? Is there a size limit?
No upload happens — compression runs on your device via the browser's hardware-accelerated WebCodecs encoder, with no size caps, daily quotas, or watermarks. Since it uses device memory, we recommend a desktop PC for multi-GB files.
Which settings should I choose?
For everyday sharing, 720p Standard gives the best balance. To preserve quality, keep the original resolution and use High Quality strength; if size matters most, go 480p Max. The size estimate updates before you start, so adjust until it fits your target.
The size barely shrinks after compression.
Your source was likely already encoded at a low bitrate, leaving no room at the same resolution. Step the resolution down (1080p→720p) or choose Max Compression for a meaningful cut. The settings screen warns you automatically when this situation is detected.
How much quality will I lose?
Standard strength targets quality that's hard to distinguish from the original on phone and PC screens. You can play the result in the browser before downloading — if it's not good enough, re-run with High Quality or a higher resolution. High-motion content (gaming, sports) shows artifacts earlier at the same settings.
How long does compression take?
It depends on device performance and video length, but with hardware acceleration it usually finishes faster than real time — a 10-minute video often compresses in 2–5 minutes. Keep the tab open and avoid switching away for long periods during compression.
What formats are supported? When can it fail?
Input supports MP4, MOV, WebM, and MKV; output is always MP4 (H.264+AAC), which plays everywhere. It can fail if the browser can't decode the source codec or lacks H.264 encoding — the latest Chrome and Edge have the widest support. Legacy formats like AVI and WMV aren't supported.
Privacy Notice
Your video and the compressed result are processed entirely in your browser and never transmitted to or stored on a server. Closing the page erases everything — personal and family videos are safe to compress here.