Free video converter

Convert between 8 video formats, compress videos, make GIFs and pull out MP3 audio — with ffmpeg running inside your browser. Your videos are never uploaded, there's no file-size paywall and no watermark.

Conversion chart

Rows are the format you have; columns are the format you want.

Available video converter conversions
From ↓ / To →	MP4	MOV	AVI	MKV	WebM	FLV	WMV	3GP
MP4		MP4→MOV	MP4→AVI	MP4→MKV	MP4→WebM	MP4→FLV	MP4→WMV	MP4→3GP
MOV	MOV→MP4		MOV→AVI	MOV→MKV	MOV→WebM	MOV→FLV	MOV→WMV	MOV→3GP
AVI	AVI→MP4	AVI→MOV		AVI→MKV	AVI→WebM	AVI→FLV	AVI→WMV	AVI→3GP
MKV	MKV→MP4	MKV→MOV	MKV→AVI		MKV→WebM	MKV→FLV	MKV→WMV	MKV→3GP
WebM	WebM→MP4	WebM→MOV	WebM→AVI	WebM→MKV		WebM→FLV	WebM→WMV	WebM→3GP
FLV	FLV→MP4	FLV→MOV	FLV→AVI	FLV→MKV	FLV→WebM		FLV→WMV	FLV→3GP
WMV	WMV→MP4	WMV→MOV	WMV→AVI	WMV→MKV	WMV→WebM	WMV→FLV		WMV→3GP
3GP	3GP→MP4	3GP→MOV	3GP→AVI	3GP→MKV	3GP→WebM	3GP→FLV	3GP→WMV

Video tools

Video to GIFTurn video clips into smooth, looping GIFs GIF to MP4Make GIFs up to 10× smaller as MP4 video Compress VideoMake videos smaller — choose quality and resolution Compress Video for WhatsAppHit an exact size like 16 MB — automatically

Extract audio from video

MP4 to MP3 MOV to MP3 MKV to MP3 WebM to MP3 AVI to MP3 FLV to MP3 WMV to MP3 3GP to MP3 MP4 to WAV MOV to WAV MP4 to M4A MOV to M4A MP4 to AAC

Convert MP4 files

MP4 is the world's most compatible video format. It usually holds H.264 video with AAC audio and plays on virtually every phone, browser, TV and editing app.

MP4 to MOV MP4 to AVI MP4 to MKV MP4 to WebM MP4 to FLV MP4 to WMV MP4 to 3GP

Convert MOV files

MOV is Apple's QuickTime format, used by iPhones and Mac editing apps. It often contains the same H.264 or HEVC video as MP4, but many Windows and Android apps handle it poorly.

MOV to MP4 MOV to AVI MOV to MKV MOV to WebM MOV to FLV MOV to WMV MOV to 3GP

Convert AVI files

AVI is Microsoft's 1992 video container. It's still used by older DVD players, TVs and Windows software, but it's large, can't stream on the web and lacks modern features.

AVI to MP4 AVI to MOV AVI to MKV AVI to WebM AVI to FLV AVI to WMV AVI to 3GP

Convert MKV files

MKV (Matroska) is an open, flexible container that can hold almost any codec plus unlimited audio and subtitle tracks. It's popular for movies and archives, but many phones and editors can't open it.

MKV to MP4 MKV to MOV MKV to AVI MKV to WebM MKV to FLV MKV to WMV MKV to 3GP

Convert WebM files

WebM is Google's royalty-free web video format, based on Matroska with VP8, VP9 or AV1 video and Opus or Vorbis audio. Browsers play it natively, but many editors and phones prefer MP4.

WebM to MP4 WebM to MOV WebM to AVI WebM to MKV WebM to FLV WebM to WMV WebM to 3GP

Convert FLV files

FLV is the Flash Video format that powered early YouTube. Since Adobe ended Flash Player in December 2020, browsers can't play FLV — convert old FLV files to MP4.

FLV to MP4 FLV to MOV FLV to AVI FLV to MKV FLV to WebM FLV to WMV FLV to 3GP

Convert WMV files

WMV is Microsoft's Windows Media Video format from 1999, stored in the ASF container. It plays well on Windows but poorly on Macs, phones and browsers.

WMV to MP4 WMV to MOV WMV to AVI WMV to MKV WMV to WebM WMV to FLV WMV to 3GP

Convert 3GP files

3GP is a lightweight MP4-style format designed for 3G mobile phones and MMS messages. Files are small but low-resolution; modern phones prefer MP4.

3GP to MP4 3GP to MOV 3GP to AVI 3GP to MKV 3GP to WebM 3GP to FLV 3GP to WMV

How does in-browser video conversion work?

Fylo uses ffmpeg, the open-source engine behind most professional video software, compiled to WebAssembly. The engine (about 31 MB) downloads once the first time you convert and is cached afterwards. When the codecs inside your file already fit the target format — for example an iPhone MOV to MP4 or an OBS MKV to MP4 — Fylo repackages the video in seconds without re-encoding, so there's no quality loss. Other conversions re-encode on your device, which takes longer for long or high-resolution videos.

Which video format should I use?

Choose MP4 for sharing, uploading and playing on any device. Keep MOV for Apple editing, MKV for archives with several audio or subtitle tracks, and WebM for royalty-free web video. AVI, WMV, FLV and 3GP are legacy formats best converted to MP4.