Your files stay with you
FFmpeg runs inside your browser. Nothing is uploaded, nothing is stored on a server.
Runs in your browser · nothing is uploaded
Convert AVI to MP4
Turn AVI files into MP4 that plays on every phone, TV and browser. When the video inside is already H.264 it is copied without any loss; otherwise it is re-encoded in good quality.
Drop videos here or click to choose
AVI, DIVX · up to 10 files · max 500 MB each
Up to 10 files at once
Drop a whole batch, 500 MB each, and download the results one by one or as a .zip.
Fast where it can be
Streams are copied instead of re-encoded whenever the result allows it, so many jobs take seconds.
Free, no account
No sign-up, no limit on the number of files, no logo on your videos. Supported by a single ad.
More free video tools
All of them are 100% free to use for anyone, and run in your browser with the same engine and the same limits: up to 10 files, 500 MB each.
Compress video
Make MP4 files smaller with a quality you choose.
Resize video
1080p, 720p, square or vertical for Instagram and TikTok.
Remove audio
Strip the sound from a video in seconds, no re-encoding.
Stabilize video
Remove camera shake from phone, GoPro and drone footage.
Black & white video
Turn a colour video into grayscale for a vintage look.
MP4 to MP3
Extract the audio of a video as an MP3 file.
MOV to MP4
Convert MOV files to MP4 that plays everywhere.
MKV to MP4
Convert MKV files to MP4 that plays everywhere.
WebM to MP4
Convert WebM files to MP4 that plays everywhere.
WMV to MP4
Convert WMV files to MP4 that plays everywhere.
FLV to MP4
Convert FLV files to MP4 that plays everywhere.
M4V to MP4
Convert M4V files to MP4 that plays everywhere.
MPEG to MP4
Convert MPEG files to MP4 that plays everywhere.
3GP to MP4
Convert 3GP files to MP4 that plays everywhere.
RM to MP4
Convert RM files to MP4 that plays everywhere.
Questions and answers
Will converting AVI to MP4 lose quality?
Often not at all: if the AVI file already contains H.264 video and AAC audio, both streams are copied into the MP4 container unchanged, which takes seconds. Only when the codecs are not MP4-compatible is the file re-encoded, with H.264 at a quality level that is visually indistinguishable from the source.
Why MP4?
MP4 with H.264 and AAC is the one format that every phone, smart TV, browser and social network plays without plugins. AVI files may need a specific player or fail to upload; the MP4 you get here can be sent, posted or embedded anywhere.
What does it cost?
Nothing. You don't need to register, there is no quota and no watermark is added to your videos. A single small ad on the page keeps the site running.
Where do my videos go?
Nowhere. Everything runs on your computer or phone, right in your browser. The video never goes online, and we never see it. Close the tab, and nothing remains.
What are the limits?
Up to 10 files per batch and 500 MB per file across all tools. These limits keep browser memory in check; laptops handle them comfortably, but phones may struggle with larger files.
How long does it take?
Removing audio and most conversions finish in seconds. Compressing, resizing, stabilizing and black & white redraw every frame, so they take about as long as the clip itself for small videos and a few times longer for 1080p. Each file shows a percentage and the time left.