HandBrake Online Alternative
A fast, zero-install HandBrake alternative for video compression. Uses WebCodecs hardware encoding directly on your GPU without complex settings.
or drag & drop here
Paste from clipboard with Cmd+V · Multiple files supported
Supported: MP4 · MOV · WebM
- Never uploaded
- No watermark
- No sign-up
- No server upload limits
How It Works
Simple 3-step compression powered entirely by your local browser
Choose Video File
Select MP4, MOV, WebM video. No upload progress bar—files load instantly from your local disk.
Pick Target MB or Balance
Select 20MB for Discord, 25MB for Gmail, or use the balance slider for optimal quality-to-size ratio.
Hardware Encoding
Encodes directly using your GPU/CPU hardware WebCodecs. Save the Discord-ready MP4 immediately.
Why Choose LessMB
The private, modern alternative to legacy cloud compressor websites
100% In-Browser Privacy
Zero bytes uploaded. Your personal photos, sensitive documents, and private videos never touch external servers or cloud storage.
Zero Queue & Instant Start
No waiting in cloud conversion queues or watching slow upload bars. Processing starts the millisecond you drop your file.
Hardware Acceleration
Harnesses WebAssembly SIMD and WebCodecs GPU encoding for high-fidelity compression directly on modern consumer hardware.
No Credit Consumption
Free tier compression uses your own device compute, meaning zero server credit drain for everyday single and batch tasks.
Current Platform Size Limits
Platform limits can change; check your account before sharing.
| Platform | Limit | Verified |
|---|---|---|
LessMB Browser Transcoder WebCodecs GPU Accelerated | Target KB/MB Solving | Modern WebCodecs standard |
HandBrake Desktop Native App (x264/x265) | Manual CRF & Bitrate Presets | Desktop software workflow |
Cloud Video Compressors Remote Server Processing | Queue, Upload Cap & Watermarks | Cloud service model |
HandBrake デスクトップ版 vs LessMB ブラウザ完結圧縮：実測比較
HandBrakeは高機能ですが、インストールや複雑なCRF値の調整が必要です。LessMBはWebCodecsを活用し、GPUハードウェア加速で目標ファイルサイズを直接指定してブラウザ内で即座に圧縮します。
| 比較項目 | LessMB (ブラウザ完結) | HandBrake (デスクトップ) | 一般的なクラウド変換 |
|---|---|---|---|
| 導入と起動 | インストール不要・即座に開始 | インストーラー導入必須 (~200MB) | 登録や順番待ちが必要 |
| 目標容量の指定 | 目標MB入力で自動計算 | CRF値の手動調整と試行錯誤 | 粗いプリセットまたは有料 |
| ハードウェア加速 | WebCodecs (GPU 直結) | x264 CPU / NVENC / QSV | サーバーの混雑度に依存 |
| プライバシー保護 | 100% 端末内処理・未送信 | 端末内ローカル処理 | 第三者サーバーへのアップロード必須 |
実測ベンチマーク（テスト素材：60秒 1080p 60fps ゲーム録画 185MB、目標サイズ 15MB以下）
| 手法 | 所要時間 | 出力サイズ | 画質 (SSIM) | 結果 |
|---|---|---|---|---|
| LessMB WebCodecs | 11.4s | 14.7 MB | 0.961 | 1発クリア |
| HandBrake x264 (CRF 26) | 28.2s | 14.8 MB | 0.963 | 合格 (2回試行) |
| HandBrake NVENC (Default) | 8.9s | 16.3 MB | 0.954 | 容量超過・再調整 |
Tips for Best Results
- No installation needed: open LessMB in Chrome, Edge, or Safari and drop your video to start transcoding immediately.
- Set an exact target MB (e.g. 10MB or 25MB) instead of guessing complex HandBrake CRF values.
- Uses your device’s dedicated hardware encoder (NVENC, Apple Silicon Media Engine, QuickSync) via WebCodecs.
- Your video never leaves your computer: 100% private and safe for confidential footage.
Frequently Asked Questions
Straight answers about this tool and how it works
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