MP4 to FLV

Convert MP4 files to Flash Video (FLV) for legacy websites and e-learning systems - 100 % in your browser.

or drag and drop your file

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How to convert MP4 to FLV

Create an FLV file from MP4 in three quick steps

1. Upload your MP4

1. Upload your MP4

Click “Upload” or drag a video onto the page. HD and long-form files are accepted and processed securely.

2. Select FLV output

2. Select FLV output

FLV is preset for Flash/RTMP delivery. Optionally tweak resolution or bitrate for faster streaming.

3. Download the FLV

3. Download the FLV

Press “Convert”. In seconds your new .flv file is ready for legacy players, LMS or low-bandwidth hosts.

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Easy convert MP4 to FLV

Optimized for legacy streaming

Generate small, optimized FLV files that load fast over RTMP (Real-Time Messaging Protocol) and play seamlessly on Flash-based sites still used in schools, corporate intranets, kiosks, and legacy e-learning systems. FLV format is ideal for organizations maintaining older infrastructure, educational institutions with existing LMS platforms, and businesses requiring compatibility with Flash-based video players. The compact file size ensures efficient bandwidth usage while maintaining good video quality, making it perfect for low-bandwidth environments and legacy streaming servers that don't support modern MP4 containers.

All formats in one place

One dashboard, many codecs

Our comprehensive video conversion platform supports FLV and many other formats including WebM, MOV, AVI, WAV, MP3, and more - all accessible from a single, user-friendly interface. No software installations, no file size limits, and no watermarks on your converted videos. Whether you need FLV for legacy systems or want to convert to modern formats, our browser-based converter handles everything seamlessly. This makes it perfect for users who work with multiple video formats and need a reliable, all-in-one solution for their conversion needs.

Explore more free tools

Enhance your converted FLV videos with our complete editing suite. Trim, resize, add subtitles, or download videos - everything you need in one browser-based workspace.
Video Resizer

Video Resizer

Resize any video for TikTok, Instagram or YouTube online: crop or fit perfectly with zero quality loss.
Add Emoji

Add Emoji

Add vibrant emoji stickers to videos in-browser: choose size, position and timing to match every scene.
Trim Video

Trim Video

Cut beginning, middle or end of any clip online: trim precisely, remove unwanted parts, keep best moments.
Reverse Video

Reverse Video

Play footage backward for social posts: upload, reverse instantly in one click, then download the edited file.
MP4 to MP3

MP4 to MP3

Extract high-quality MP3 audio from MP4 movies online: fast conversion, no installs, zero loss in bitrate.
Add Stickers

Add Stickers

Insert fun, colorful stickers on video frames: drag, resize, schedule appearance and boost viewer engagement.
YouTube Downloader

YouTube Downloader

Download YouTube videos to your device in chosen format and resolution: quick, secure, no quality degradation.
Add GIF

Add GIF

Overlay animated GIFs on top of any video track: control size, placement and timing for dynamic visual effects.
Crop Video

Crop Video

Crop footage directly online to focus on key content: set custom frame, remove distractions, export instantly.
YouTube to MP3

YouTube to MP3

Convert YouTube links to MP3 audio in seconds: keep music, podcasts or lectures offline with perfect fidelity.
TikTok Downloader

TikTok Downloader

Save TikTok videos in HD without watermark: paste the link, download instantly for offline viewing or edits.
Twitter Downloader

Twitter Downloader

Grab videos from Twitter posts in multiple qualities: paste URL, download fast and watch offline anytime.
YouTube to MP4

YouTube to MP4

Get YouTube videos as MP4 files with selectable quality: copy URL, convert online, store for editing or sharing.
Instagram Downloader

Instagram Downloader

Download Instagram videos, Reels, stories and IGTV in high definition: no login, no watermarks, free forever.
AVI to MP4

AVI to MP4

Convert legacy AVI files to modern MP4 format online: reduced size, broader compatibility, instant download.
MP4 to FLAC

MP4 to FLAC

Extract lossless FLAC audio from MP4 clips: preserve full quality for music archiving or professional editing.
WebM to MP4

WebM to MP4

Transform WebM videos to universal MP4 for smooth playback on any device: drag, convert and save quickly.
MP4 to WMA

MP4 to WMA

Turn MP4 video into compact WMA audio files within your browser: efficient size, ideal for Windows players.
MP4 to DivX

MP4 to DivX

Re-encode MP4 movies to high-compression DivX format: smaller files, good quality, ready for legacy devices.
MP4 to MOV

MP4 to MOV

Change MP4 videos to Apple-friendly MOV format online: perfect for QuickTime or Final Cut workflows.
MP4 to M4A

MP4 to M4A

Strip audio from MP4 and save as clean M4A tracks: great for iOS playlists and streaming with small file size.
MP4 to AVI

MP4 to AVI

Convert MP4 clips to widely supported AVI containers: maintain quality while ensuring legacy device playback.
MP4 to WebM

MP4 to WebM

Export MP4 content as lightweight WebM for web delivery: faster streaming and reduced bandwidth consumption.
MP4 to WMV

MP4 to WMV

Switch MP4 videos to WMV format for smooth playback on Windows PCs and classic media players.
MP4 to MPEG

MP4 to MPEG

Repackage MP4 footage as standard MPEG files: optimize for broadcasting, DVDs or older hardware.
MP4 to MPG

MP4 to MPG

Convert MP4 files to MPG quickly online: ensure compatibility with vintage devices and authoring software.
MP4 to WAV

MP4 to WAV

Extract uncompressed WAV audio from MP4 video: ideal for editing, podcasts or high-quality sound archiving.
MP4 to FLV

MP4 to FLV

Turn MP4 videos into lightweight FLV for legacy web players: faster loading without sacrificing clarity.
MP4 to M4V

MP4 to M4V

Convert MP4 to DRM-ready M4V for effortless sync with iTunes, Apple TV and other iOS environments.
MP4 to MKV

MP4 to MKV

Wrap MP4 streams in flexible MKV containers: add subtitles, multiple tracks and achieve better compression.
MP4 to GIF

MP4 to GIF

Create looping GIF animations from MP4 snippets: select range, convert online, share on social platforms.
MP4 to WebP

MP4 to WebP

Generate animated WebP images from MP4 clips: enjoy tiny file sizes and rapid page loading speeds.
MP3 to MP4

MP3 to MP4

Combine MP3 audio with still imagery to form MP4 video: ideal for YouTube or social music sharing.
WAV to MP4

WAV to MP4

Encode WAV audio into MP4 video with a static cover: reduce size and improve compatibility for uploads.
GIF to MP4

GIF to MP4

Upgrade looping GIFs to smooth MP4 video: smaller files, better quality, compatible with all devices.
See all features

FAQ

Why convert MP4 to FLV?

FLV (Flash Video) format is still required by legacy Flash players, Learning Management System (LMS) modules, RTMP (Real-Time Messaging Protocol) streaming servers, and older web-based video platforms where modern MP4 containers are unsupported. Many educational institutions, corporate intranets, and organizations with existing Flash-based infrastructure continue to rely on FLV format for video delivery. Converting MP4 to FLV ensures compatibility with these legacy systems, allowing you to maintain existing workflows while working with modern video sources. FLV is particularly useful for e-learning platforms, corporate training systems, and legacy web applications that haven't migrated to HTML5 video players.

Does FLV support H.264 video?

Yes, FLV format fully supports H.264 video codec. Our converter intelligently wraps your existing H.264 video stream inside an FLV container without re-encoding, preserving the original compression efficiency and video quality. This means you get the best of both worlds: the compatibility of FLV format for legacy systems and the high-quality compression of H.264 codec. The conversion process maintains the original bitrate, resolution, and frame rate, ensuring no quality loss during the container change. This makes it ideal for users who need FLV compatibility but want to preserve the quality of their H.264-encoded MP4 source files.

Will modern browsers play FLV files?

Most modern browsers (Chrome, Firefox, Edge, Safari) have dropped native Flash support, so FLV files will not play directly in modern web browsers without additional plugins or players. FLV format is primarily intended for legacy systems, Flash-based applications, RTMP streaming servers, and specialized video players that still support Flash technology. For public-facing websites and modern web applications, we recommend using MP4 or WebM formats instead, which offer native browser support and better compatibility. However, FLV remains valuable for internal systems, e-learning platforms, legacy applications, and organizations maintaining Flash-based infrastructure that hasn't yet migrated to HTML5 video solutions.

Can I set a custom bitrate or frame size?

Absolutely. After uploading your MP4 file, click "Advanced settings" to access comprehensive customization options. You can adjust video resolution (frame size), bitrate for both video and audio streams, frame rate, audio codec settings, and other encoding parameters before exporting your FLV file. This level of control allows you to optimize file size, quality, and compatibility for your specific use case - whether you need smaller files for low-bandwidth environments, higher quality for archival purposes, or specific settings for legacy players. The advanced settings give you professional-grade control over the conversion process, ensuring your FLV output meets your exact requirements.

Is there an upload size limit?

Yes, videos up to 2 GB per file are accepted for conversion. Larger video files will convert more slowly due to increased processing time, but they follow the same secure, encrypted workflow. The conversion time depends on factors such as file size, video resolution, codec complexity, and selected encoding settings. For very large files, consider trimming or splitting them into smaller segments before upload to ensure faster processing. All files are processed securely using encrypted HTTPS connections, and larger files receive the same level of privacy protection and automatic deletion as smaller ones.

Are my files secure during conversion?

Yes, your files are completely secure during the conversion process. All file uploads use encrypted HTTPS connections to protect your data during transmission from your device to our servers. Files are processed securely in volatile memory (RAM) and are automatically deleted from our servers within minutes after conversion completion. We never store, share, or access your media files beyond the conversion process, ensuring complete privacy and security for all your video content. Your files remain yours alone, with no permanent storage, third-party access, or data retention - providing enterprise-grade security for your sensitive video files.