Supported formats and your browser's codecs
The converter reads 64+ file types with its own built-in FFmpeg, whatever your browser can play. Here is the full list, and a live test of what this browser supports natively.
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Formats you can convert from
| Format | Extensions | Usual codecs | About |
|---|---|---|---|
| MP4 (MPEG-4 Part 14) | .mp4 .m4v | H.264, HEVC, AV1, MPEG-4 / AAC, MP3 | The default container for phones, cameras and the web, standardised by ISO as MPEG-4 Part 14. |
| QuickTime MOV | .mov .qt | H.264, HEVC, ProRes / AAC, PCM | Apple's QuickTime container. iPhones record MOV, usually HEVC video since iOS 11 unless 'Most Compatible' is set. |
| Matroska MKV | .mkv .mk3d .mka | almost anything, plus multiple audio and subtitle tracks | An open container that can hold nearly any codec plus chapters and many subtitle tracks, popular for OBS recordings and archives. |
| WebM | .webm | VP8, VP9, AV1 / Opus, Vorbis | A Matroska subset defined by Google for royalty-free web video. Screen recorders and browser MediaRecorder output WebM. |
| AVI | .avi | MPEG-4 Part 2 (DivX/Xvid), MJPEG, DV / MP3, PCM | Microsoft's 1992 Audio Video Interleave container. It can't store B-frame timing or modern codecs cleanly. |
| Windows Media Video | .wmv .asf | WMV7/8/9, VC-1 / WMA | Video in the ASF container from Windows Movie Maker, older cameras and screen capture tools. |
| Flash Video | .flv .f4v | Sorenson H.263, VP6, H.264 / MP3, AAC | The Flash-era web format. Many old downloads and RTMP stream recordings are FLV. |
| MPEG-1/2 | .mpg .mpeg .vob .m2v | MPEG-1, MPEG-2 / MP2, AC-3 | DVD and early digital TV video. VOB files from a DVD are MPEG-2 program streams. |
| AVCHD / MPEG-TS | .mts .m2ts .ts | H.264, MPEG-2 / AC-3, AAC | Transport stream files written by Sony and Panasonic camcorders (AVCHD) and broadcast recorders. |
| 3GP / 3G2 | .3gp .3g2 | H.263, MPEG-4, H.264 / AMR, AAC | A small MP4 variant made for early mobile phones; old flip-phone clips are usually 3GP with AMR audio. |
| HEVC / H.265 | .mp4 .mov .hevc .mkv | H.265 video in any container | A codec, not a container. It halves bitrate vs H.264 but plays poorly on older PCs, Firefox and many web apps. |
| Animated GIF | .gif | LZW-compressed 256-colour frames | An image format from 1987 that also loops animation. No sound, and files get huge fast. |
| Ogg video | .ogv .ogg | Theora / Vorbis, Opus | The Xiph.org open container, common on Wikimedia and Linux. |
| MXF | .mxf | XDCAM, DNxHD, AVC-Intra / PCM | Material Exchange Format from broadcast and pro cameras. Reading is supported; very large files may exceed browser memory. |
| M4A | .m4a | AAC, ALAC | Audio-only MP4, the format of iPhone voice memos and iTunes purchases. |
| MP3 | .mp3 | MPEG-1 Layer III | The universal lossy audio format. |
| Ogg audio | .ogg .oga | Vorbis, Opus | Open audio from games, Linux apps and WhatsApp-style voice notes (.opus). |
| WAV | .wav | PCM | Uncompressed audio from recorders and DAWs. |
| DVD VOB | .vob | MPEG-2 / AC-3, MP2, LPCM | The video files inside a DVD's VIDEO_TS folder: MPEG-2 program streams split into chunks of up to 1 GB. |
| M4V | .m4v | H.264, HEVC / AAC, AC-3 | Apple's variant of MP4 used by iTunes, Apple TV app exports and HandBrake presets. DRM-free M4V is just MP4 with another extension. |
| MPEG transport stream | .ts .m2ts | H.264, HEVC, MPEG-2 / AAC, AC-3, MP2 | Broadcast and streaming format: TV recordings, IPTV captures, downloaded HLS segments and Blu-ray/AVCHD .m2ts files. |
| FLAC | .flac | FLAC (lossless) | Free Lossless Audio Codec: CD-quality audio compressed to roughly half the size of WAV without losing anything. |
Also read: .m4v .qt .mk3d .asf .f4v .vob .m2v .m2ts .ts .mts .3g2 .mxf .dv .nut .rm .rmvb .ivf .y4m .mjpeg .h264 .h265 .hevc .obu .wtv .dav .nsv .swf .aac .ac3 .eac3 .aiff .amr .ape .au .caf .dts .mka .oga .opus .spx .tak .tta .wma .wv .mpc .flac, animated GIF and APNG.
Formats you can convert to
| Output | Video codec | Audio codec | When to use it |
|---|---|---|---|
| MP4 | H.264 | AAC | H.264 + AAC. Plays on almost everything: phones, TVs, browsers, editors, social apps. |
| WebM | VP8 | Opus | VP8 + Opus, royalty-free, made for the web. VP9/AV1 sources are copied untouched when possible. |
| MOV | H.264 | AAC | QuickTime container with H.264 + AAC; opens in QuickTime, iMovie and Final Cut. ProRes Proxy is available for editing. |
| MKV | H.264 | AAC | Matroska holds almost any codec, so most files re-wrap into MKV in seconds without re-encoding. |
| AVI | MPEG-4 Part 2 | MP3 | MPEG-4 Part 2 (Xvid-style) + MP3, the combination old DVD players and car screens expect. |
| WMV | WMV8 (wmv2) | WMA v2 | Windows Media for legacy Windows software and PowerPoint versions that insist on it. |
| FLV | Sorenson H.263 (flv1) | MP3 | Flash Video, only for old players and hardware that still require it. |
| MPEG | MPEG-2 | MP2 | MPEG-2 program stream, the DVD-era format many set-top boxes and editors still read. |
| TS | H.264 | AAC | MPEG transport stream, used by broadcast, IPTV and HLS. |
| OGV | Theora | Vorbis | Ogg Theora + Vorbis, fully open. Wikimedia Commons accepts it. |
| GIF | 256-colour frames | – | Silent looping animation with a 256-colour palette. Best for short clips. |
| MP3 | – | MP3 (LAME) | The universal audio file. VBR ~190 kbps by default. |
| M4A | – | AAC | AAC in an MP4 audio wrapper; iPhone, iTunes and Apple Music native. Often extracted with no re-encode. |
| WAV | – | 16-bit PCM | Uncompressed PCM for editing and DAWs. Large files, no quality loss after decoding. |
| FLAC | – | FLAC | Lossless compression: about half the size of WAV with identical audio. |
| OGG | – | Vorbis | Ogg Vorbis, open and widely used in games. |
| Opus | – | Opus | The most efficient general audio codec; great for voice at low bitrates. |
What runs in your browser, and what doesn't
VideoConvert uses ffmpeg.wasm, the FFmpeg toolkit compiled to WebAssembly. It is the same code that powers most desktop converters, running on your CPU inside the page. That buys privacy, but it has honest limits:
- Speed. The engine is single-threaded and has no GPU access. Remuxing (MOV→MP4, MKV→MP4 with compatible codecs) is near-instant. Real re-encoding of 1080p H.264 typically runs at roughly real-time to a few times slower on a laptop, and slower on phones. 4K and HEVC sources are the slowest.
- Memory. WebAssembly can address about 2 GB. Input files are read straight from disk, but the output is built in memory, so very large outputs can fail. Phone browsers often allow far less; keep phone jobs under a few hundred MB.
- Formats we can't write. HEVC/H.265, VP9 and AV1 encoding is not offered: in this WebAssembly build x265 stalls, VP9 runs out of memory and AV1 isn't compiled in. We read all three fine, and write H.264, VP8, MPEG-4, MPEG-2, Theora, WMV, FLV and ProRes Proxy.
- DRM. Protected files (iTunes M4V, streaming downloads, encrypted DVDs) can't be converted by any open tool.
- Phones. Keep the screen on and the tab in front. iOS and Android pause background tabs, which stops the conversion.