Free Online MP4 Converter
Convert any video to or from MP4 — the universal video format.
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What is MP4?
MP4 (MPEG-4 Part 14) is the most widely used video container format in the world. Developed by the Moving Picture Experts Group, MP4 can store video, audio, subtitles, and still images in a single file. Its combination of high compression efficiency and broad device compatibility has made it the default format for everything from smartphone recordings to professional video production.
Our free online MP4 converter handles both directions — converting videos from formats like MOV, AVI, MKV, and WebM into MP4, as well as converting MP4 files into other formats when needed. The converter supports modern codecs including H.264 (AVC), H.265 (HEVC), and AV1, giving you full control over the balance between file size and visual quality. All processing happens on our servers, so there is nothing to install and your original files are never modified.
Codec Comparison
H.264 (AVC)
Good — ~1.5 GB per hour at 1080p
Universal — every browser and deviceDefault for sharing, streaming, and social media
H.265 (HEVC)
Excellent — ~800 MB per hour at 1080p
Wide — most 2018+ devices, Safari, Chrome 107+Archival, large video libraries, 4K content
AV1
Best — ~600 MB per hour at 1080p
Growing — Chrome, Firefox, Edge; limited mobile HWFuture-proof archival, YouTube, royalty-free workflows
Why Convert MP4?
Video files come in dozens of container formats, and not every device or platform supports every one. A MOV file from your iPhone may not play on a Windows PC without additional software. An MKV from a Blu-ray rip may not upload to social media. An AVI from legacy security cameras may need modernization. MP4 solves these compatibility problems because virtually every device, browser, and platform manufactured in the last decade supports it natively.
Converting to MP4 also helps with file size. Older formats like AVI and WMV use less efficient compression, resulting in unnecessarily large files. Re-encoding these into MP4 with H.264 or H.265 can reduce file sizes by 50-80% without visible quality loss. This saves storage space, speeds up uploads, and makes sharing via email or messaging apps practical.
Works Everywhere
How to Convert
Upload your video
Select output format
Download converted file
Popular Conversions
Common Use Cases
Convert iPhone MOV recordings to MP4 for universal playback on Windows, Android, and smart TVs
Prepare videos for social media upload — YouTube, Instagram, TikTok, and Facebook all prefer MP4
Reduce large AVI or WMV files to MP4 for email attachments and cloud storage
Convert MKV files with multiple subtitle tracks into a single MP4 for streaming devices
Archive old video formats (3GP, FLV, SWF, VOB) into MP4 for long-term preservation
Extract audio from MP4 videos as MP3, WAV, or FLAC files
Convert WebM videos from screen recordings into MP4 for editing in Premiere Pro or Final Cut
Re-encode MP4 files with different codecs (H.264 to H.265) for smaller file sizes
MP4 vs Other Formats
| Feature | MP4 | Other Format |
|---|---|---|
| Compressionvs AVI | H.264/H.265/AV1 — excellent efficiency | DivX/XviD MPEG-4 Part 2 — older, less efficient |
| Browser supportvs MKV | All modern browsers natively | Limited — Chrome/Firefox via WebM |
| File size (1 hour HD)vs AVI | ~1.5 GB (H.264) / ~800 MB (H.265) | ~4-8 GB (uncompressed DV/MJPEG typical) |
| Subtitle supportvs MKV | Embedded text and image-based tracks | More flexible — ASS/SSA styling support |
| Streaming supportvs MOV | Native — HTTP progressive download and HLS/DASH | Requires remuxing to adaptive streaming format |
| Editing compatibilityvs MOV | Universal — all NLEs support MP4 import | Better for Apple workflows (ProRes in MOV) |
Tips for Best Results
- 1
Use H.264 codec for maximum compatibility — every device and browser supports it. Choose H.265 only when you need smaller files and know your target devices support it.
- 2
For social media uploads, use 1080p resolution, H.264, and CRF 18-23. Most platforms re-encode uploaded videos anyway, so ultra-high quality settings waste upload time.
- 3
When converting from lossless sources (ProRes, DNxHR), use CRF 16-18 to preserve quality. For re-encoding already-compressed video, use CRF 20-23 to avoid generation loss.
- 4
If your MP4 file is too large for email (typically 25MB limit), use our video compressor instead of converting — it reduces size without changing the format.
- 5
Enable two-pass encoding for the best quality-to-size ratio. Single-pass is faster but slightly less efficient at distributing bitrate across scenes.
- 6
Keep the original frame rate (24fps, 30fps, 60fps) unless you specifically need to change it. Mismatched frame rates cause stuttering and judder.
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