🎬 Video Tools
Quick answer: Convert video files free in your browser — MP4, MOV, MKV, WebM, AVI, WMV, FLV, and 38 more formats. Open the Convertlo video converter: drop your file, select output, download. Powered by FFmpeg.wasm — no upload required.

Free Online Video Converter

Convert MP4, WebM, MOV, AVI, MKV, FLV, and WMV — all 45 video converters run in your browser using FFmpeg.wasm. Extract audio, create GIFs, or re-encode for Plex, YouTube, or Mac. No upload, no signup.

✓ 45 video converters ✓ Powered by FFmpeg.wasm ✓ No upload — 100% private ✓ Free forever
Open Video Converter →

Which Video Format Is Right for You?

MP4
YouTube, iPhone, Android, web
Universal format. H.264+AAC inside MP4 plays on every device. Use this when in doubt.
WebM
Web streaming, Chrome/Firefox
Smaller than MP4 at equal quality. Native in browsers. Best for video on websites.
MOV
Final Cut Pro, iMovie, Mac
Apple's native container. Required for Final Cut Pro import. Uses H.264 or ProRes.
MKV
Plex, Jellyfin, media servers
Multi-track audio, embedded subtitles, chapters. Best for media server libraries.
AVI
Legacy Windows software
Old Microsoft format. Convert to MP4 for modern use.
WMV
Windows Movie Maker exports
Windows-only. Convert to MP4 for YouTube, iPhone, and Mac compatibility.

Most Popular Video Conversions

MP4 → WebM→ WebM → MP4→ MOV → MP4→ MKV → MP4→ AVI → MP4→ WMV → MP4→ MP4 → GIF→ GIF → MP4→ MP4 → MP3→ MP4 → MKV→ WebM → MOV→ FLV → MP4→

All 45 Video Converters

MP4 conversions

MP4 → WebM→ MP4 → AVI→ MP4 → MOV→ MP4 → MKV→ MP4 → GIF→ MP4 → WMV→ MP4 → FLV→ MP4 → MP3→

WebM conversions

WebM → MP4→ WebM → AVI→ WebM → MOV→ WebM → MKV→ WebM → WMV→ WebM → FLV→ WebM → GIF→

MOV conversions

MOV → MP4→ MOV → AVI→ MOV → MKV→ MOV → WMV→ MOV → FLV→

AVI conversions

AVI → MP4→ AVI → MKV→ AVI → MOV→ AVI → WMV→ AVI → WebM→ AVI → FLV→

MKV / WMV / FLV conversions

MKV → MP4→ MKV → AVI→ WMV → MP4→ WMV → MKV→ WMV → AVI→ FLV → MP4→

Learn More — Video Format Guides

Video Format Guide: MP4, WebM, MOV, MKV Explained
A complete breakdown of every major video format — codecs, compatibility, and when to use each one.
Read article →
How to Convert MOV to MP4 for Free
Convert QuickTime MOV files to MP4 for YouTube, Android, and Windows — step by step.
Read article →
GIF to MP4: Why You Should Switch and How
MP4 loops are 10–50× smaller than GIF — here's how to convert and embed them on any platform.
Read article →

Other Converter Categories

🖼️ Image Converter→ 🎵 Audio Converter→ 📝 Document Converter→ 📄 PDF Converter→

Frequently asked questions

YouTube recommends MP4 with H.264 video and AAC audio at 128 kbps. This gives the fastest upload processing and the highest output quality. Uploading WebM or MOV works but YouTube's transcoder takes longer and may produce lower-quality results.
MP4 is the universal format — plays on every device and platform. MKV (Matroska) is a container that supports multiple audio tracks, embedded subtitles, chapters, and codecs not supported by MP4. Use MP4 for sharing and YouTube; use MKV for media server libraries (Plex, Jellyfin) where subtitle and multi-track support matters.
Yes. Use the MP4 to MP3 converter or any video converter — select MP3 as the output format and the audio track is extracted without re-encoding the video. Works with MP4, MOV, MKV, AVI, WebM, and WMV source files.
FFmpeg.wasm is FFmpeg compiled to WebAssembly, which means it runs the full FFmpeg engine directly in your browser. Your video files never leave your device — no server receives them, making conversion both faster (no upload time) and completely private.
Container-only remuxes (e.g., MKV to MP4 where both use H.264) preserve quality perfectly. Re-encoding to a different codec (e.g., WMV to H.264 MP4) involves a small quality loss. The converter uses high-quality CRF 18 settings to minimize this.
Yes — use the GIF to MP4 converter. It produces a looping MP4 that is typically 10–50× smaller than the original GIF and plays natively everywhere GIFs play, with far better quality.