FLV to MP4

Upload a FLV file and download it as MP4. Free to start.

Drop files here, or press Enter to choose them. Up to 50 MB per file.
Drop a FLV file hereFree · up to 50 MB · 10 operations in total without an account · or paste with Ctrl+V
  • Sent over HTTPS · link expires in 24 h

How it works

  1. Step 1:

    Drop the FLV file on the orange block above, or press “Choose FLV”.

  2. Step 2:

    Press “Convert to MP4”. The block shows the progress while the server converts the file.

  3. Step 3:

    Press “Download” to save the MP4 file. On Free the link works for 24 hours.

How FLV to MP4 conversion works

Flash Video (FLV) packages Sorenson Spark or VP6 video in Adobe's Flash container, now largely obsolete following the end of Flash Player support. MPEG-4 Part 14 Video (MP4) packages H.264 or H.265 video with AAC audio in a container format widely supported across every platform and device. This conversion changes the file's encoding, compression method, and supported feature set. When the source codecs already match the target container the streams are copied without re-encoding (zero quality loss); otherwise the video is re-encoded at a configurable quality. The result is a standard MP4 file readable by any compatible application. 1converter handles FLV-to-MP4 conversion server-side: files are uploaded over HTTPS, processed on isolated cloud infrastructure, and the converted output is available for download for 24 hours before automatic deletion. No account is required for standard conversions.

Quality levels for FLV → MP4

LevelFile sizeSpeed
Low qualitySmallest file, basic qualityVery smallVery fast
Medium qualityRecommendedBalanced size and qualityMediumFast
High qualityLarger file, great qualityLargeModerate
Maximum qualityLargest file, best possible qualityVery largeSlow

Video Tip: Medium quality is ideal for web streaming. Use High or Maximum for videos you plan to edit further or archive.

When to convert

What the MP4 file is good for and why people convert to it.

  • MP4 plays on most modern players and devices without Flash support
  • Better browser/device compatibility for sharing FLV-origin video
  • Exporting archived FLV clips to watch on mobile and smart TVs
  • Converting training or webinar recordings originally delivered as FLV

Where your file goes

  • It travels to our server over an encrypted HTTPS connection and is converted there.
  • The MP4 file comes back as a private link. It stops working after 24 hours on Free and 7 days on paid plans, and then the files are deleted.

Questions and answers

What people ask before converting FLV to MP4.

Ask supportAll questions
Will converting FLV to MP4 preserve the original quality exactly?
FLV is a container that typically uses codecs like Sorenson Spark or VP6, while MP4 commonly uses H.264 video. The conversion may re-encode to H.264/AAC, so quality depends on the selected compression level.
Does MP4 support the same transparency as FLV?
FLV usually does not provide reliable alpha transparency like modern formats. MP4 can store transparency only with specific codecs and setup, but typical FLV-to-MP4 conversions produce standard opaque video.
Why is the MP4 file usually smaller than the FLV?
MP4 with H.264 is often more space-efficient than the common FLV codecs. Re-wrapping plus re-encoding can reduce bitrate while maintaining comparable perceived quality.
Will the converted MP4 play on browsers and devices?
MP4 is widely supported by browsers and media devices, especially when encoded with H.264 video and AAC audio. If the source FLV uses unusual codecs, the converter re-encodes them into compatible MP4 streams.

More about this pair

Many files at once? Starter converts 5 at a time, 100 a day.

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