Video Converter for All Formats
Drop one or more videos, choose the output format, resolution and quality, then download the converted files. Conversion happens in your browser: your videos never leave your device, with no watermark and no sign-up.
- 12 output formats
- Several files at once
- Resolution and quality
- No upload, no sign-up
100% private — Everything is processed directly in your browser: your files, voice, and image are never sent to Chatzam's servers.
How to convert a video to another format
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Add your videos
Drag one or more video files (MP4, MOV, AVI, MKV, WMV, WEBM, FLV, 3GP, MPEG, GIF…) into the box, or select them on your device.
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Choose the format
Tap the format you want, then adjust the resolution (from 1080p to 144p) and quality if needed. The output file size is estimated live.
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Convert and download
Start the conversion: download each file separately, or all of them together in a ZIP.
A complete video converter, no software needed
All the common formats
Output to MP4, WEBM, MOV, AVI, MKV, GIF, MP3, 3GP, FLV, MPEG, WMV and OGV, from almost any video, including ones your browser can't play.
Useful settings
Resolution, five quality levels, video and audio codec, video without sound: you can tailor the file to an old player, a website or a phone.
Fast when possible
If the video's tracks are already compatible with the chosen format, they are copied as is: conversion in seconds with no quality loss.
Private and unlimited
Conversion is done by FFmpeg right in your browser: no upload, no queue, no limit on the number of files, and no watermark.
Which video format should you choose?
MP4 (H.264 and AAC) is the universal format: it plays on every phone, computer, TV and social network. It's the right choice 9 times out of 10. WEBM (VP8 and Vorbis) is the web's open format, handy for embedding a video on a website. MOV is Apple's format (iPhone, iMovie, Final Cut). AVI (MPEG-4 “Xvid” and MP3) and MPEG (MPEG-2) are for old living-room DVD players, USB sticks plugged into an older TV, or some editing software. MKV is a flexible container that accepts almost any codec. WMV is for older Windows PCs, 3GP for pre-smartphone cell phones, FLV for old Flash players, and OGV for open-source software. GIF turns a short clip into an animated image, and MP3 keeps only the sound.
Container, codec, resolution: what really changes
A video file is a “box” (the container: MP4, MKV, AVI…) holding a picture track compressed by a video codec (H.264, VP8, MPEG-4…) and a sound track compressed by an audio codec (AAC, MP3, Vorbis…). Changing format means changing the box, and often the codecs. When the original tracks are already accepted by the new box, for example an H.264 iPhone video going from MOV to MP4 or MKV, the tool copies them without recompressing: it's instant and lossless. Otherwise the video is re-encoded at the quality you choose. Resolution is set by the short side of the picture (720p = 720 pixels), for both horizontal and vertical videos; lowering the resolution is the most effective way to shrink a file.
Video converter or “Convert Video to MP4”: which one to use?
If you just want an MP4 that plays everywhere from a MOV, AVI or MKV, the “Convert Video to MP4” tool does it in one click with no settings. This video converter goes further: it outputs every format, in both directions (MP4 to AVI, MKV to MOV, WEBM to MP4, MP4 to WMV…), sets the resolution, quality and codecs, and handles several files in one go. For a video too big to send, “Compress Video” aims straight for a target size (WhatsApp, email, Discord). To keep only the sound in a format other than MP3 (WAV, M4A, FLAC…), use the “Audio Converter”.
File size, conversion time and limits
The estimated size shown before conversion is a ballpark figure: it depends on the video's content (a scene with lots of motion takes more space). The “Balanced” level gives quality very close to the original at a reasonable size. Since everything happens on your device, speed depends on its power: a video of a few minutes in 720p converts in a few minutes on a computer, more slowly on a phone, and a simple copy without re-encoding takes only a few seconds. H.265 (HEVC) and VP9 are accepted as input but not offered as output: encoding them doesn't work properly in a browser. On first use, the video engine (about 30 MB) is downloaded once.
Frequently Asked Questions
How do I convert a video to MP4, AVI or MOV for free?
Drop the video, tap the format you want (MP4, AVI, MOV…), then “Convert”. The converted file downloads in one click, with no sign-up and no watermark.
Can I convert several videos at the same time?
Yes. Add as many files as you like: they're converted one after another with the same settings, then downloadable one by one or together in a ZIP.
Does converting reduce quality?
Not if the tracks can be copied as is (the “Fast lossless conversion” option). Otherwise the video is re-encoded: at the “High” and “Maximum” levels, the difference can't be seen with the naked eye.
How do I convert a video for an old TV or DVD player?
Choose AVI (MPEG-4 codec, “DivX/Xvid” compatible) or MPEG, at 480p, close to DVD resolution. Copy the file to a USB stick formatted as FAT32.
My AVI or WMV file won't display: can it be converted?
Yes. Your browser can't play these formats, but the conversion engine can decode them. The duration and estimated size will simply show up after conversion.
Are my videos uploaded to a server?
No. Conversion is done by FFmpeg (WebAssembly) in your browser; your files stay on your device.