Convert FLV to WEBM Online
Effectively dead — Flash Player was discontinued in 2020, and no modern browser supports FLV natively. Converting to WEBM gives you a key advantage: completely royalty-free (vp8/vp9/av1 + vorbis/opus), designed specifically for web delivery with small file sizes. WEBM is best for embedding royalty-free video in html5 web pages without codec licensing concerns.
Why Convert FLV to WebM?
Effectively dead — Flash Player was discontinued in 2020, and no modern browser supports FLV natively — converting to WEBM overcomes this by providing completely royalty-free (vp8/vp9/av1 + vorbis/opus), designed specifically for web delivery with small file sizes
WEBM is the right choice when you need to: serving html5 video on websites where royalty-free codecs are required
Gain broader compatibility — WEBM works with Chrome, Firefox, Edge, Opera, Safari 14+; YouTube uses VP9/AV1 in WebM containers
Your FLV files were created for converting archived flv files from early youtube downloads to modern mp4, but now you need a format suited to different workflows
FLV vs WebM — Format Comparison
Flash Video (.flv)
Web Media (.webm)
How to Convert FLV to WebM
Upload your FLV file
Drag your .flv file onto the upload area or click to browse. We accept FLV files up to 1 GB.
Choose WEBM as output format
Select .webm (Web Media) from the format list. Adjust quality settings if needed — higher quality means larger file size.
Convert and download
Click Convert and wait for processing. Your WEBM file will be ready to download in seconds. The result is optimized for embedding royalty-free video in html5 web pages without codec licensing concerns.
Frequently Asked Questions
Does converting between FLV and WEBM degrade quality?
expand_more
Each lossy re-encoding can introduce additional artifacts. For best results, start from the highest-quality source available. WEBM's advantage is: completely royalty-free (vp8/vp9/av1 + vorbis/opus), designed specifically for web delivery with small file sizes.
How large will my WEBM file be compared to the original FLV?
expand_more
FLV files are typically 5 MB – 1 GB, while WEBM files are typically 5 MB – 2 GB. The actual size depends on content complexity and any quality settings you choose.
What software can open the converted WEBM file?
expand_more
WEBM is compatible with: Chrome, Firefox, Edge, Opera, Safari 14+; YouTube uses VP9/AV1 in WebM containers.
What is the maximum file size I can convert?
expand_more
PureConverter accepts FLV files up to 1 GB. Your files are processed securely and deleted from our servers after conversion.
What's the difference between FLV and WEBM?
expand_more
FLV (Flash Video) is best for playing legacy flash video content from the pre-html5 era of web video. WEBM (Web Media) is best for embedding royalty-free video in html5 web pages without codec licensing concerns. Key tradeoff: FLV's advantage is extremely small file sizes for its era, with fast seeking and low-latency streaming capabilities, while WEBM's advantage is completely royalty-free (vp8/vp9/av1 + vorbis/opus), designed specifically for web delivery with small file sizes.
Pro Tips for FLV to WebM Conversion
For the best WEBM quality, start with the highest-resolution FLV source available — lossy compression works better with more data to analyze
Keep a backup of your original FLV file — while our conversion is reliable, having the source is always recommended
WEBM works especially well for: uploading to youtube, which internally transcodes to vp9/av1 in webm containers
Did you know? WebM is actually a subset of Matroska (MKV) — every WebM file is a valid MKV file, but MKV files can contain codecs that WebM doesn't allow.
Ready to Convert?
Upload your FLV file above and get your WebM in seconds. Free, fast, and secure.