Step 1: Upload your FLV files using the button above or by drag and drop.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Download your converted M4V files.
FLV to M4V Conversion FAQ
How does the FLV to M4V converter work?
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We re-package or re-encode your FLV into the M4V container. When the codec matches, we copy streams (fast, lossless); when it does not, we re-encode with H.264 / H.265 / VP9 at a high default quality.
Is converting FLV to M4V lossy?
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If the codec inside FLV is compatible with M4V, the conversion is a remux (no quality loss). If we need to re-encode, the default CRF setting is visually lossless for typical viewing distances.
What resolution will my M4V output have?
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Source resolution by default. The options panel lets you downscale to 1080p, 720p, 480p, or pick a custom size — useful for shrinking files for sharing or upload.
Does the converter preserve audio tracks and subtitles?
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Yes when M4V supports them (MP4, MKV, MOV). All audio tracks, languages, and embedded subtitles are kept. For single-track containers (3GP, FLV), only the default track survives.
How big can my FLV file be?
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Free accounts: 100 MB. PRO accounts: 5 GB. For very large FLV files we recommend the PRO plan or pre-trimming with our video-trim tool.
What codec is used inside the M4V output?
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We pick the best-supported codec for the M4V container — H.264 for MP4 / MOV / FLV, VP9 for WebM, AV1 when targeting modern web, H.265 when M4V supports it. You can override in the options panel.
Can the converter change frame rate?
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Yes. The options panel exposes target frame rates (24, 25, 30, 60). By default we preserve the source frame rate.
Will my converted M4V play on TV, phone, and browser?
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Yes. Our default profile targets universal playback — H.264 + AAC inside M4V works on every major platform, browser, and smart TV from the last decade.
Is the FLV to M4V converter free?
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Yes for files under 100 MB. PRO unlocks larger files, GPU-accelerated transcoding, and 4K output.
Does PDF.to support 4K and HDR FLV files?
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Yes. 4K is preserved by default; downscale via the options panel if needed. HDR is preserved when M4V supports it (MKV, MP4 with HEVC) or tonemapped to SDR when targeting older formats.
How long does a FLV to M4V conversion take?
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Stream-copy (compatible codec) finishes near disk speed — a 1 GB file in well under a minute. Re-encoding scales with resolution and length; expect roughly real-time for 1080p on the free plan, faster on PRO.
Do you keep my FLV video?
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No. The FLV upload and M4V output are deleted within an hour. Conversion happens in an isolated worker with no content logging.