Convert MP4 to FLV for Flash Player Compatibility

Convert your MPEG-4 Part 14 files to Flash Video online for free. MP4 can sometimes lack multi-track or subtitle support found in flexible containers like MKV — FLV solves that. No registration, no watermarks, instant download.

Drag & drop your file here, or

Max 100 MB • Max 10 min duration • Max 1080p

How to Convert MP4 to FLV — 3 Steps

FFmpeg re-encodes your MP4 file to H.264 or VP6 FLV — flash player compatibility.

  1. Upload your MP4 file

    Select your MP4 file from cameras. Files up to 100 MB and 10 minutes in duration are accepted.

  2. Confirm and convert

    Confirm you own the file and click Convert to FLV. Processing typically completes in under 60 seconds.

  3. Download your FLV file

    Download your FLV immediately — ready to legacy flash player applications expect flv or f4v video input.

Why Convert MP4 to FLV?

MP4 (MPEG-4 Part 14) can sometimes lack multi-track or subtitle support found in flexible containers like MKV. Converting to FLV gives you flash player and archived sites.

Flash playerLegacy Flash Player applications expect FLV or F4V video input
Archived sitesArchived websites with embedded Flash players require FLV streams
RTMPLegacy RTMP streaming servers may require FLV format input
Archive systemsBroadcast archive systems storing legacy content in FLV format

Frequently Asked Questions

Why convert MP4 to FLV?

MP4 (MPEG-4 Part 14) can sometimes lack multi-track or subtitle support found in flexible containers like MKV. Converting to FLV gives you legacy flash player applications expect flv or f4v video input.

Will I lose video quality converting MP4 to FLV?

Our converter outputs H.264 or VP6 video at high-quality settings. When re-encoding is required, we use settings that minimise visible artefacts. The resulting FLV file will be visually very close to the original.

What MP4 files can I upload?

You can upload MP4 files from cameras, phones, screen recorders, and video editors. Files must be under 100 MB, under 10 minutes in duration, and not exceed 1080p resolution.

What is the maximum file size for MP4 to FLV conversion?

The maximum upload size is 100 MB and the maximum video duration is 10 minutes. Resolution is capped at 1920×1080 (1080p).

Is my MP4 file kept private?

Yes. Files are processed privately and automatically deleted within 60 minutes. We never store, sell, or analyse your content.

MP4 & FLV Format Guides

Understand the formats you're converting between — specs, pros, cons, and use cases.

What is MP4?Full guide — technical specs, pros, cons, and compatible softwareWhat is FLV?Full guide — technical specs, pros, cons, and compatible softwareAll Format GuidesBrowse all 14 video and audio format guides

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