WebP to FLV Converter

How to Convert WebP to FLV Online

1. Upload Your WebP File: Drag and drop or click "+ Add Files" to select one or many WebP images. Both static and animated WebP are accepted, and batch uploads run through the same settings.
2. Pick Duration, Quality Preset and Background Color: Set Image Duration to control how long each still WebP appears (1/60 second up to 10 seconds per frame, default 5 seconds). Choose a Quality Preset of Constant Quality or Constraint Quality — the Very High default keeps detail without ballooning the file. Background Color (default Black) only shows if your WebP has transparency, since FLV does not carry an alpha channel.
3. Set Resolution and Merge Strategy (Optional): Keep original dimensions, choose a Fixed Resolution preset (240p through 4320p, plus social aspect ratios like 1080x1920), or enter a custom Width x Height. If you upload multiple WebP files, switch Merge strategy between "Merge images" (one FLV containing all frames in order) and "Video per image" (one FLV per WebP).
4. Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

Why Convert WebP to FLV?

WebP is Google's web image format (announced September 30, 2010), used by 97% of browser traffic and supporting both static and animated frames. FLV is Adobe's Flash Video container, introduced in Flash Player 7 on September 10, 2003. Adobe officially ended Flash Player support on December 31, 2020, and blocked Flash content from playing in the official runtime starting January 12, 2021. WebP-to-FLV is therefore a legacy-pipeline conversion — useful when a system you do not control still expects FLV input.

• Legacy CMS and LMS uploads — Older Moodle, Joomla and proprietary e-learning platforms built around 2008-2015 still require FLV in their video upload widgets, even after their players stream HLS or MP4 to end users.
• RTMP ingest to streaming servers — Wowza Streaming Engine, Red5 and Nginx-RTMP modules accept FLV as a native muxed format for live or pseudo-live ingest, where MP4 needs fragmenting first.
• Archive replacement frames — If you maintain an FLV archive (lecture recordings, security DVR exports, old game-capture libraries) and a frame is corrupt, dropping in a re-rendered FLV from a WebP still keeps the surrounding pipeline intact.
• Animated WebP to a single-file timeline — Animated WebP frames become a continuous FLV clip that legacy NLEs and Adobe Animate/Flash Professional CS6 can import as a movie symbol.
• Embedded device players — Some industrial signage players, in-flight entertainment units and kiosk hardware from the Flash era only decode FLV with Sorenson Spark or H.263; converting a modern WebP source gives them content they can actually play.

WebP vs FLV — Format Comparison

Codec and Setting Quick Guide for the FLV Output

Frequently Asked Questions

Will my converted FLV play in a web browser in 2026?

No modern browser plays FLV natively. Chrome, Firefox, Edge and Safari all removed Flash Player support alongside Adobe's December 31, 2020 end-of-life. To play the FLV you produce here you will need VLC, MPC-HC, ffplay or a server that transcodes FLV on the fly (Wowza, Nginx-RTMP). If the goal is browser playback, convert to MP4 or WebM instead — see our WebP to MP4 and WebP to WebM tools.

Why does my transparent WebP turn black in the FLV?

FLV has no alpha channel. When the source WebP has transparent regions, those pixels are filled with the Background Color option (default Black) before being encoded into FLV. Change Background Color to White, Green or any of the 24 preset swatches if your downstream workflow expects a different fill or plans to chroma-key the result.

How is each frame of an animated WebP timed in the resulting FLV?

Animated WebP carries its own per-frame timing, but the converter re-times the output using the Image Duration you pick. Set Image Duration to 1/24 second for 24 fps cinematic pacing, 1/30 second for standard 30 fps, or leave the default 5 seconds if you want each frame held as a slideshow still. The FLV will then play at that constant frame interval rather than the WebP's original timing.

Should I pick H.264 or older FLV codecs?

This tool uses the FLV container's standard codec defaults; you do not pick the codec directly. FLV supports Sorenson Spark, VP6, H.263 and H.264 video, plus MP3, AAC, Nellymoser and ADPCM audio (FLV-as-container gained H.264/AAC support in 2010). If you need a specific legacy codec for a particular Flash player build, your safest path is to convert to MP4 (H.264) and remux into FLV in ffmpeg with -c copy -f flv.

Why would anyone still need FLV after Flash was discontinued?

Three reasons keep FLV alive: RTMP streaming servers (Wowza, Nginx-RTMP, Red5) still accept FLV as a native ingest format because RTMP packets and FLV tags share a structure; legacy LMS and CMS upload forms validate filename extensions and reject anything but .flv; and large archive collections — university lecture libraries, surveillance DVR exports, game-capture footage from 2005-2015 — are stored as FLV and sometimes need new content added in the same format for tooling compatibility.

Is the conversion lossless?

No. FLV uses lossy video codecs (Sorenson Spark, VP6 and H.263 in their typical FLV profiles), so the encode introduces compression artifacts. Pick the Very High preset to minimize visible loss, and avoid round-tripping (re-encoding an FLV back to FLV multiple times) since each pass degrades quality. For lossless archival, keep the original WebP and re-derive the FLV when needed.

Can I upload multiple WebP files and get a single FLV slideshow?

Yes. Upload as many WebP files as you want, then under Merge strategy select "Merge images". The converter concatenates them in upload order using the Image Duration value for each frame's display time. To get one FLV per WebP instead, switch Merge strategy to "Video per image".

Does this run in my browser or upload to a server?

Files are uploaded to xconvert's processing servers for the encode (FLV muxing with the underlying ffmpeg toolchain requires server-side compute), then results are made available for download in the same session. Files are not retained for training, sharing or analytics beyond the session lifetime.

What if my downstream system actually needs MP4 or WebM, not FLV?

Convert to those formats directly instead of round-tripping through FLV. We have WebP to MP4, WebP to WebM and WebP to GIF tools that target each format's native codec and container. If you already have FLV that needs modernizing, FLV to MP4 handles that direction.