WebM to MP4 Converter
Pricing
from $39.00 / 1,000 video converteds
Go to Apify Store
WebM to MP4 Converter
Convert WebM video files to MP4 format using FFmpeg. Fast, reliable transcoding with support for batch URLs and custom output settings.
WebM to MP4 Converter
Pricing
from $39.00 / 1,000 video converteds
Convert WebM video files to MP4 format using FFmpeg. Fast, reliable transcoding with support for batch URLs and custom output settings.
You can access the WebM to MP4 Converter programmatically from your own applications by using the Apify API. You can also choose the language preference from below. To use the Apify API, you’ll need an Apify account and your API token, found in Integrations settings in Apify Console.
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Each item must have either a 'url' (HTTP/HTTPS link to a WebM file) or a 'kvStoreKey' (key in the actor's Key-Value Store). Min: 1, Max: 3.", "items": { "type": "object" }, "default": [ { "url": "https://www.w3schools.com/html/mov_bbb.webm" } ] }, "videoCodec": { "title": "Video Codec", "enum": [ "h264", "h265" ], "type": "string", "description": "Video codec to use for encoding. H.264 offers the best compatibility (all browsers, devices, platforms). H.265 produces smaller files but has limited browser support — best for archiving or mobile apps.", "default": "h264" }, "preset": { "title": "Encoding Preset", "enum": [ "ultrafast", "fast", "balanced", "slow", "veryslow" ], "type": "string", "description": "Encoding speed vs quality/size tradeoff. 'ultrafast' is fastest but produces larger files. 'veryslow' produces the smallest files but takes much longer. 'balanced' (default) is the best choice for most use cases.", "default": "balanced" }, "crf": { "title": "Quality (CRF)", "minimum": 0, "maximum": 51, "type": "integer", "description": "Constant Rate Factor controls quality. Lower = better quality, larger file. 0 = lossless (very large), 18 = high quality, 23 = default, 28 = lower quality, 51 = worst quality.", "default": 23 }, "maxBitrate": { "title": "Max Video Bitrate", "type": "string", "description": "Maximum video bitrate (e.g., '2M', '5M', '10M'). Leave empty for CRF-only quality control (recommended). Use this to cap file size for streaming scenarios.", "default": "" }, "resolution": { "title": "Output Resolution", "type": "string", "description": "Force output to a specific resolution (e.g., '1920x1080', '1280x720', '854x480'). Leave empty to keep the original resolution. Aspect ratio is preserved with padding if needed.", "default": "" }, "maxWidth": { "title": "Max Width", "type": "integer", "description": "Scale video down if wider than this value (pixels). Aspect ratio is preserved. Ignored if 'resolution' is set." }, "maxHeight": { "title": "Max Height", "type": "integer", "description": "Scale video down if taller than this value (pixels). Aspect ratio is preserved. Ignored if 'resolution' is set." }, "fps": { "title": "Output Frame Rate", "minimum": 1, "maximum": 120, "type": "integer", "description": "Output frames per second. Leave empty to keep the original frame rate. Common values: 24, 30, 60." }, "audioCodec": { "title": "Audio Codec", "enum": [ "aac", "mp3", "none" ], "type": "string", "description": "Audio codec: 'aac' (default, universal compatibility), 'mp3' (widely supported), 'none' (strip audio from output).", "default": "aac" }, "audioBitrate": { "title": "Audio Bitrate", "type": "string", "description": "Audio bitrate. Common values: '64k' (low), '128k' (default, good quality), '192k' (high), '320k' (maximum).", "default": "128k" }, "audioSampleRate": { "title": "Audio Sample Rate", "type": "integer", "description": "Audio sample rate in Hz. Leave empty to keep the original sample rate. Common values: 44100, 48000." }, "volume": { "title": "Volume Multiplier", "minimum": 0, "maximum": 5, "type": "number", "description": "Audio volume adjustment. 1.0 = original volume (default). 0.5 = half volume. 2.0 = double volume. Range: 0.0 to 5.0.", "default": 1 }, "outputPrefix": { "title": "Output File Prefix", "type": "string", "description": "Prefix added to output filenames in the Key-Value Store. For example, 'converted_' produces 'converted_myvideo.mp4'.", "default": "converted_" }, "fastStart": { "title": "Fast Start (Web Optimized)", "type": "boolean", "description": "Move the MP4 moov atom to the beginning of the file. Enables streaming playback — the browser can start playing before the entire file is downloaded. Highly recommended for web use.", "default": true }, "maxConcurrency": { "title": "Max Concurrent Conversions", "minimum": 1, "maximum": 3, "type": "integer", "description": "Maximum number of videos to convert simultaneously. Video encoding is CPU-intensive — keep this at 1-2 unless you have excess memory and CPU available. Range: 1-3.", "default": 1 }, "downloadTimeout": { "title": "Download Timeout (ms)", "minimum": 10000, "maximum": 300000, "type": "integer", "description": "Timeout for downloading each source video in milliseconds. Default: 60000 (1 minute). Range: 10000-300000.", "default": 60000 }, "conversionTimeout": { "title": "Conversion Timeout (ms)", "minimum": 30000, "maximum": 600000, "type": "integer", "description": "Timeout for FFmpeg conversion per video in milliseconds. Default: 300000 (5 minutes). 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