Quickly convert online video with FREE or premium options to MP4, AVI, MOV, MKV, FLV, 3GP, WMV, etc. Convert and compress video to a smaller size or convert online video to Full HD (720p, 1080p) or Ultra quality HD 4K (2160p) with no file size limit. The best and safest online video converter to high quality video. Convert video to iPhone, Android, MAC, PC, Windows, etc. Convert online fast The base font size of a document is the most common font size in that document, i.e., the size of the bulk of text in that document. When you specify a Base font size, we automatically rescales all font sizes in the document proportionately, so that the most common font size becomes the specified base font size and other font sizes are rescaled appropriately. How to Convert to Zip? Click the “Choose Files” button to select your files. Convert to Zip by clicking the "Convert" button. Once the conversion finishes, click the "Download Zip" button to save the file. If you need an mp3 file, the conversion will last longer and will be lossy: ffmpeg -i "input.mp4" -vn -c:a libmp3lame "audio.mp3" If yo don't like command line, I'm not used to doing this. You might use a free tool like My-MP4Box-GUI. You select the "Demux" tag, load the input file, check the audio then click "demux", but the file would be raww Step 1 - Upload MKV file. Select MKV file from your computer using the browse function. Step 2 - Choose to MP3. Choose .MP3 destination format. We support most video formats. Step 3 - Download your converted MP3 file. Download your converted MP3 file immediately. Zamzar supports conversion between a wide variety of different file formats. We're adding support for new formats all the time - if there's a format that you'd like us to support why not contact us and we'll do our best to add it. Click a category to see details of the file formats: Document file formats. Image file formats. Guide to Convert Large Files to MP4 using UniConverter. Step 1. Open UniConverter and add videos. Run the software after downloading and installing it on your PC. Click on the +Add Files button to browse and load local videos to be converted. Large size videos in multiple numbers can be added for the process. After installing the program, follow these steps to free convert MP4 to MP3: Step 1 – Click “Add MP4” to add your video file. You may opt to add different MP4 videos which will be displayed on the video list. Step 2 – Choose your desired output folder. Step 3 – Click “Convert to MP3”. You can listen to the converted MP3 files by 6VMM.