# FLV to MP4 Converter Convert FLV video files to MP4 format > Canonical page: https://elysiatools.com/en/tools/flv-to-mp4 - **Category:** Media - **Keywords:** flv, mp4, convert, video, format, ffmpeg, flash, streaming, h264 ## Overview Convert FLV (Flash Video) files to MP4 format. FLV was widely used for web streaming but has been deprecated. MP4 is the modern standard with universal device and platform support. ## Inputs - **FLV Video File** (file): Select FLV video to convert - **Video Codec** (select) - **Audio Codec** (select) - **CRF Quality (18-28, lower is better)** (number): Only applies when re-encoding. 18-28 is recommended range ## When to use - When you have old Flash Video (.flv) files that will not play on modern smartphones, tablets, or smart TVs. - When you need to upload legacy video content to modern web platforms or social media networks that no longer support the FLV format. - When you want to change the container of a video to MP4 without re-encoding by copying the original video and audio streams directly. ## How it works - Upload your FLV video file using the file selector. - Choose your preferred video and audio codecs, or select 'Copy' to bypass re-encoding for a faster process. - Set the CRF quality value between 18 and 28 if you are re-encoding the video. - Click the convert button to process the file and download your new MP4 video. ## Use cases - Archiving legacy web videos from the early 2000s into a modern, future-proof MP4 format. - Preparing old FLV screencasts or tutorials for editing in modern video editing software that rejects FLV files. - Optimizing video files for mobile playback by converting them to MP4 with H.264 video and AAC audio. ## Frequently asked questions ### Can I convert FLV to MP4 without losing video quality? Yes, by setting both the video and audio codecs to 'Copy', the tool changes the container format to MP4 without re-encoding the underlying streams, preserving original quality. ### What is the recommended CRF quality range? A CRF value between 18 and 28 is recommended when re-encoding, where 18 offers higher quality and 28 offers smaller file sizes. ### Which video codec should I choose for maximum compatibility? The H.264 (libx264) video codec combined with the AAC audio codec is highly recommended for universal compatibility across devices and browsers. ### Is there a file size limit for the uploaded FLV video? Yes, the maximum supported file size for conversion is 100 MB. ### Can I convert FLV to H.265/HEVC? Yes, you can select the H.265/HEVC (libx265) option from the video codec dropdown menu to encode your video using the newer compression standard. ## Related tools - [AVI to MP4 Converter](https://elysiatools.com/en/tools/avi-to-mp4): Convert AVI video files to MP4 format - [MKV to MP4 Converter](https://elysiatools.com/en/tools/mkv-to-mp4): Convert MKV video files to MP4 format - [MOV to MP4 Converter](https://elysiatools.com/en/tools/mov-to-mp4): Convert MOV video files to MP4 format - [MP4 to AVI Converter](https://elysiatools.com/en/tools/mp4-to-avi): Convert MP4 video files to AVI format - [MP4 to FLV Converter](https://elysiatools.com/en/tools/mp4-to-flv): Convert MP4 video files to FLV format - [MP4 to MKV Converter](https://elysiatools.com/en/tools/mp4-to-mkv): Convert MP4 video files to MKV format - [MP4 to MOV Converter](https://elysiatools.com/en/tools/mp4-to-mov): Convert MP4 video files to MOV format - [MP4 to WebM Converter](https://elysiatools.com/en/tools/mp4-to-webm): Convert MP4 video files to WebM format ## Samples - [Video H.264 Samples](https://elysiatools.com/en/samples/video-h264-samples): Sample video files encoded in H.264 (AVC) format - [Video AV1 Samples](https://elysiatools.com/en/samples/video-av1-samples): Sample video files encoded in AV1 format - [Video H.265 Samples](https://elysiatools.com/en/samples/video-h265-samples): Sample video files encoded in H.265 (HEVC) format - [Video Samples](https://elysiatools.com/en/samples/video-samples): Sample video files in different formats and orientations ## Related content - [Audio Encoding and Format Conversion Tools](https://elysiatools.com/en/hubs/audio-convert): Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows. - [Video-to-Audio and Animation Conversion Tools](https://elysiatools.com/en/hubs/video-convert): Compare tools that turn video into audio, extract video streams, and convert between short-form video and animated image formats in one hub. - [Audio Editing and Cleanup Tools](https://elysiatools.com/en/hubs/audio-utility): Compare audio trimming, silence removal, fades, mixing, and denoise tools in one hub for podcast, voiceover, and music cleanup workflows. - [Video Preview, Extraction, and Subtitle Tools](https://elysiatools.com/en/hubs/video-utility): Compare video preview generation, stream extraction, audio extraction, subtitle translation, and quick flip tools in one hub for lightweight video prep workflows.