Reduce video file size by up to 80% without sacrificing quality. Works entirely in your browser — no uploads, no waiting, no limits.
MP4, WebM, MOV, AVI, MKV, FLV, 3GP, WMV supported
Drag & drop supported · Batch compression available
Professional-grade compression with full privacy and zero limitations
Your video files are processed entirely within your browser using WebAssembly technology. Nothing is uploaded to any server — your content stays completely private.
Achieve dramatic file size reductions using CRF-based encoding, resolution downscaling, frame rate reduction, and modern H.265/HEVC codec technology.
Specify your exact target output size (e.g. 50 MB) and the tool automatically calculates the optimal bitrate to achieve that file size for your video duration.
Instantly compare original vs compressed file sizes with a clear percentage reduction badge so you can see exactly how much space was saved.
Choose from Max Quality, Balanced, Max Compression, Web Streaming, Email/Share, or Mobile presets — each optimized for different use cases and targets.
Compress multiple video files simultaneously with consistent settings. Add any number of videos and process them all in one click, saving significant time.
Compress MP4, WebM, MOV, AVI, MKV, FLV, 3GP, WMV files. Output as MP4 or WebM — always producing web-compatible, universally playable video files.
Compress audio alongside video — reduce audio bitrate to 96 kbps or lower, or completely strip audio for video-only files. Full AAC and MP3 support.
Four simple steps to a smaller video file — no software needed
Drop or select your video file (MP4, MOV, WebM, MKV and more). Add multiple files for batch compression.
Pick a preset (Balanced, Max Compression, Web, etc.) or set a target output file size. Fine-tune in Settings if needed.
Click "Compress Video" and watch real-time progress in your browser. FFmpeg processes everything locally — no server wait times.
See your before/after size comparison and percentage saved, preview the result inline, then download your compressed video.
Video compression is the process of encoding video data more efficiently to reduce file size while preserving acceptable visual quality. This is achieved through codec algorithms that eliminate redundant visual information between frames. Modern codecs like H.264 (AVC) and H.265 (HEVC) use sophisticated techniques including inter-frame prediction, discrete cosine transforms, and entropy coding to compress video data by 100x or more compared to raw footage.
Compressing video online has become essential for content creators, marketers, and developers who need to upload videos to social media, email attachments, websites, or cloud storage without sacrificing too much quality. Smaller files also load faster, reducing bandwidth costs and improving viewer experience.
Best practices for video compression: Use H.265 codec for maximum compression efficiency — it achieves the same quality as H.264 at roughly half the bitrate. Set resolution to 1080p or 720p for most online use cases. CRF values of 24–32 offer the best balance between quality and size reduction. For web delivery, always enable "Web Optimized" (Fast Start) so videos begin playing immediately. If targeting a specific platform (Instagram, WhatsApp, email), use the platform's recommended bitrate settings or try the Email/Mobile presets.
Our browser-based compressor ensures your video data never leaves your device, addressing privacy concerns that arise when uploading sensitive or proprietary video content to third-party servers.
Everything about compressing video online
Typically 30–60% with minimal visible quality loss using CRF 23–28 in H.264. With H.265, you can achieve 50–70% reduction at the same visual quality. Maximum compression (CRF 35+) can reduce size by 80% but will introduce visible artifacts.
Completely safe. Our tool uses WebAssembly (FFmpeg.wasm) running entirely within your browser. Your video files are never transmitted to any server. All processing happens locally on your device.
"Balanced" works for most everyday needs. Use "Max Compression" for email attachments or sharing. "Web Streaming" for embedding on websites. "Email/Share" optimises for the ~25MB limit on email. "Mobile" produces smaller files suited for smartphone screens and mobile data.
Enter a specific target size (e.g. 50 MB) and the tool calculates the precise video bitrate needed to hit that file size based on your video's duration. This is ideal when you need to meet a specific upload size limit (Discord, email, etc.).
Input: MP4, WebM, MOV, AVI, MKV, FLV, 3GP, WMV, and most common video formats. Output: MP4 (H.264 or H.265) or WebM. MP4 is recommended for universal compatibility.
H.265 (HEVC) uses more advanced compression algorithms that achieve approximately 40–50% better compression efficiency than H.264 at the same visual quality. The trade-off is longer encoding time. Use H.265 when file size is the priority and encoding speed is less critical.
Yes, but browser-based processing of 4K files can be slow and memory-intensive. We recommend setting the output resolution to 1080p or 720p when compressing 4K footage for online use. Very large files (>1GB) may exceed browser memory limits.
Use the "Email/Share" or "Mobile" preset, set resolution to 720p, and output as MP4. WhatsApp supports video up to 16MB, so set the target size to 15MB for safety. Instagram Reels and Stories support up to 100MB for standard uploads.
From video editing to file conversion — everything you need, free, online, and private.