Free Online Video Converter & Compressor
MediaCC Video Converter is a tool that lets you convert and compress videos directly in your browser. No file upload, no server processing, and no privacy risk. Your files never leave your device.
Why Choose MediaCC?
- 100% local processing – files never leave your device
- Free to use, no signup required
- Fast video conversion and compression powered by FFmpeg.wasm
- Supports MP4, WebM, MOV, MKV, AVI and more
How It Works
- Select a video from your device (drag & drop or click to upload)
- Choose output format or compression level
- Download the processed video – all processing happens locally in your browser
Popular video conversions
Drag and drop video files here
Or click the button below to select files
100% local processing, files are not uploaded to server
Supported Video Formats
MediaCC vs Other Online Tools
See how MediaCC compares with typical cloud-based converters and compressors, and when each option makes sense.
| Dimension | MediaCC | Typical Cloud Tools | Who Should Use |
|---|---|---|---|
| Privacy & data flow | 100% local — videos never uploaded | Videos uploaded and processed on servers | Use MediaCC for private, unreleased, or client footage |
| Account / signup | No account required | Free tier with file size/duration caps | MediaCC for anonymous, registration-free workflows |
| Engine | FFmpeg.wasm in browser | Server-side FFmpeg or proprietary encoders | Cloud tools when you need fastest encode on huge files |
| Batch processing | Queue up to 15 files locally | Batch limits on free plans | MediaCC for multiple clips without sending to cloud |
| Format coverage | MP4, WebM, MOV, MKV, AVI | Wider codec support (ProRes, AV1 presets, etc.) | CloudConvert / Convertio for niche professional codecs |
| Compression presets | Lossless & lossy modes built-in | More manual encoding controls on VEED, Clideo | VEED / Clideo when you need fine-grained encoding control |
| Large file handling | Best under ~50MB per file in browser | Often accept 500MB–2GB+ on paid tiers | FreeConvert / Media.io when files exceed local browser limits |
| Watermarks / fees | Free, no watermarks | Free exports may be capped or watermarked | MediaCC for simple, watermark-free local conversion |
Privacy & data flow
100% local — videos never uploaded
Videos uploaded and processed on servers
Use MediaCC for private, unreleased, or client footage
Account / signup
No account required
Free tier with file size/duration caps
MediaCC for anonymous, registration-free workflows
Engine
FFmpeg.wasm in browser
Server-side FFmpeg or proprietary encoders
Cloud tools when you need fastest encode on huge files
Batch processing
Queue up to 15 files locally
Batch limits on free plans
MediaCC for multiple clips without sending to cloud
Format coverage
MP4, WebM, MOV, MKV, AVI
Wider codec support (ProRes, AV1 presets, etc.)
CloudConvert / Convertio for niche professional codecs
Compression presets
Lossless & lossy modes built-in
More manual encoding controls on VEED, Clideo
VEED / Clideo when you need fine-grained encoding control
Large file handling
Best under ~50MB per file in browser
Often accept 500MB–2GB+ on paid tiers
FreeConvert / Media.io when files exceed local browser limits
Watermarks / fees
Free, no watermarks
Free exports may be capped or watermarked
MediaCC for simple, watermark-free local conversion
When MediaCC is the better choice
- •Confidential photos or videos that must not leave your device
- •Quick convert/compress without creating an account
- •Batch processing several files with zero upload wait
- •HEIC photos from iPhone handled entirely on your phone or PC browser
- •You want a free tool with no watermarks and no hidden upload
When a sidebar tool may be worth trying
- •You need maximum compression quality (TinyPNG, Squoosh for images)
- •Rare formats like RAW, PSD, or professional codecs (CloudConvert, Convertio)
- •Very large videos (500MB+) that exceed browser memory (FreeConvert, Media.io)
- •Advanced manual video encoding controls (VEED, Clideo for video)
- •Desktop batch workflows with CLI (HandBrake for video)
Detailed Usage Guide
How to Use
1. Format Conversion
- Supported formats: MP4, WebM, MOV, AVI, MKV, WMV, FLV
- Select "Convert" operation and choose the target format (e.g., MOV to MP4)
- Click the "Start Processing" button, and the system will complete the conversion locally in your browser
- Processing progress will be displayed during conversion, and you can download the video in the new format after completion
2. Video Compression
- Select "Compress" operation and choose compression mode
- High-quality mode: Uses a quality-focused FFmpeg preset to optimize file size while preserving visual quality
- Smaller-size mode: Uses stronger compression settings to reduce file size with acceptable visual quality
- Compression may take a considerable amount of time, please be patient
3. Batch Processing
- You can upload multiple video files simultaneously
- All files will be processed in queue order to avoid browser performance issues from processing multiple large files simultaneously
- Each file can be downloaded individually after processing is complete
4. File Size Limits & Notes
- Single file limit: Maximum 150MB per video file
- Total file size limit: Maximum 1000MB total file size per session
- File count limit: Maximum 15 files can be processed simultaneously
- Large file processing warnings:
- Video processing is more time-consuming than image processing; we recommend keeping individual files under 50MB for the best experience
- Video files over 100MB may cause processing timeout (up to 45 minutes) or browser memory issues
- 20-50MB videos may take 20-30 minutes, while 50-100MB videos may take 30-45 minutes
- If processing fails due to timeout from large files, consider compressing the video with another tool first
- Keep the browser tab open when processing large files to avoid interruption from switching tabs
- We recommend processing in a stable network environment to avoid failures due to network issues
Implementation Principles
Video Processing Engine
- Uses FFmpeg.wasm (WebAssembly version of FFmpeg) to process videos in the browser:
- FFmpeg.wasm is a WebAssembly port of FFmpeg, providing complete video encoding and decoding capabilities
- All processing is completed in a virtual file system within browser memory
- Uses iframe isolation environment to ensure stable module loading and execution
- Supports multi-threaded processing (requires SharedArrayBuffer support)
Format Conversion Process
- Read video file as ArrayBuffer and write to FFmpeg virtual file system
- Use FFmpeg commands for transcoding: -c:v libx264 (video encoder), -c:a aac (audio encoder)
- Set encoding parameters: preset controls encoding speed, CRF value controls quality (range 18-28)
- Read processed video data from virtual file system and convert to Blob
- Clean up temporary files and release memory
Compression Principle
- High-quality mode: Uses a quality-focused preset to optimize encoding efficiency while preserving visual quality
- Smaller-size mode: Uses stronger compression parameters to significantly reduce file size
- All processing is completed locally in the browser without relying on server resources
Privacy & Security
All processing happens locally in your browser. MediaCC never uploads, stores, or analyzes your files. Your videos stay on your device from start to finish – no server, no cloud, no third-party access.