JPG to FLV Converter

Convert JPG to FLV: What This Tool Actually Produces

This tool turns a still JPG photo into a short FLV (Flash Video) clip — it holds your single image on screen for a set number of seconds and wraps it in the legacy Flash container. It does not animate or add motion to a still photo; the output is the same frame held for the duration you pick. This page is for people who need an FLV specifically (a legacy Flash player, an old RTMP/media-server workflow, or a course package that still expects .flv), and it explains the few settings that matter plus when you should reach for MP4 instead.

How to Convert JPG to FLV

1. Upload Your JPG File: Drag and drop or click "+ Add Files" to load one or more JPG, JPEG, or JFIF images. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion.
2. Set the Duration and Merge Strategy: Under Advanced Options, set Duration (how long each still is shown — default "5 seconds per frame") and choose Merge images to combine several photos into one FLV slideshow, or Video per image to get a separate FLV for each file.
3. Pick a Background Color and Quality Preset (Optional): Background Color (default Black) fills any letterbox area when your image's aspect ratio doesn't match the output frame, and Preset (default "Very High") controls how aggressively the frame is compressed. You can also override the Video Codec and target Resolution.
4. Convert and Download: Click "Convert" and download your FLV. No sign-up, no watermark.

Walk-through: Duration, Codec, and Background Color

The three settings that change your result the most are Duration, Video Codec, and Background Color.

• Duration controls clip length, not motion. "5 seconds per frame" means a single JPG becomes a 5-second clip of that frame. Pick a shorter value (down to a fraction of a second) for a near-instant clip, or a longer one (up to 10 seconds per frame) if the FLV is a title card or intro slide.
• Video Codec — what each option means. Default for FLV output is the classic FLV codec (FFmpeg's Sorenson-Spark-style H.263 variant, the original Flash Video codec). Flash Video and Flash Video (v2) are the Flash Screen Video codecs, which are lossless and better suited to screen-capture-style content than photos. H.264 is also selectable inside an FLV container and gives the best quality per byte if your target player supports H.264-in-FLV. For a single photo, the default FLV codec is the most broadly compatible with old Flash players.
• Background Color fills the gaps. If your photo is portrait but the output frame is landscape (or vice-versa), the leftover area is painted with the Background Color. Black is the safe default; switch to White or another color to match a slide deck.
• Merge images for a slideshow. Upload several JPGs, keep "Merge images," and each photo is shown for the Duration in sequence — a quick way to build a Flash-era slideshow without an editor.

Common Errors and How to Fix Them

• "The FLV won't play in my browser" — No modern browser plays FLV natively; Adobe ended Flash Player support on December 31, 2020 and began blocking Flash content on January 12, 2021. Play the file in VLC (which still decodes FLV), or convert it to a modern format with FLV to MP4.
• "Output looks stretched or has black bars" — Your image's aspect ratio doesn't match the chosen Resolution. Either leave Resolution on "Keep original," or set a Resolution that matches your photo's ratio so no letterboxing is added.
• "My clip is too short / too long" — That's the Duration setting, not a bug. One JPG with "5 seconds per frame" is a 5-second clip; change Duration to lengthen or shorten it.
• "The colors look slightly off versus the JPG" — FLV's classic codec is lossy and re-encodes the frame; fine detail and gradients soften a little. Choose H.264 or one of the Flash Video (lossless screen) codecs if you need a sharper frame, at the cost of compatibility.

When This Doesn't Work — and What to Use Instead

FLV is a legacy format with no path forward for new content: it was developed by Macromedia, first released on September 10, 2003, later maintained by Adobe, and effectively retired alongside Flash Player at the end of 2020. Make an FLV only when something downstream genuinely requires .flv — an old learning-management package, a legacy desktop player, or an RTMP/media-server pipeline that ingests FLV. For anything you'll share, embed on a website, post to social media, or play on a phone, skip FLV: convert your photo with JPG to MP4 for a universally playable clip, JPG to GIF for a short looping image, or combine several photos with Image to Video. If your JPG is a frame grabbed from DRM-protected or corrupted media, re-export a clean JPG first — the converter can't recover a damaged source image.

Frequently Asked Questions

Does converting a JPG to FLV add any motion or animation?

No. A single JPG becomes a static clip — the same frame held for the Duration you set (default 5 seconds). There's no panning, zooming, or animation. If you want movement, you need an actual video source or an editor that generates a Ken Burns-style effect; this tool simply wraps your still image in an FLV container.

Which FLV codec should I choose for a photo?

For maximum compatibility with old Flash players, keep the default FLV codec — it's the original Sorenson-Spark-derived H.263 variant every Flash Player supports. Choose H.264 (also valid inside FLV) for the best quality-per-byte if your target player handles H.264-in-FLV, or the Flash Video / Flash Video (v2) lossless screen codecs only for sharp screen-capture-style frames, since they produce much larger files for photographic content.

Is FLV still worth using in 2026, or should I pick MP4?

For almost everything, pick MP4. Adobe ended Flash Player support on December 31, 2020, no modern browser plays FLV natively, and no current platform asks for it. The only good reasons to output FLV today are a specific legacy requirement: an older LMS/course package, a desktop Flash player, or an RTMP media-server workflow that still records FLV. Otherwise use JPG to MP4.

Can I turn several JPGs into one FLV slideshow?

Yes. Upload all your images and keep the Merge images strategy — each photo is shown for the Duration value in upload order, producing a single FLV slideshow. Switch to Video per image if you'd rather get one FLV file per photo instead.

Why is there no sound in my FLV?

A JPG has no audio, so the converter produces a video-only FLV by default. FLV containers can carry MP3 or AAC audio, but since the source is a still image there's no soundtrack to include. To add music you'd need to merge the clip with an audio file in a separate video-editing step.

How much does the FLV codec change my image quality?

The default FLV codec is lossy and re-encodes the frame, so in our testing a detailed photo shows mild softening of fine textures and gradients compared to the source JPG, similar to a moderate JPEG re-save. For a title card or a simple graphic the difference is hard to spot; for a high-detail photo where sharpness matters, select the H.264 codec or a lossless Flash Video codec instead.