BMP to FLV Converter

Converting BMP to FLV: What This Tutorial Covers

This walk-through is for the narrow case where something still demands a Flash-era .flv file and all you have is a Windows bitmap. A BMP is a single still image; FLV (Flash Video) is a video container, so this conversion holds your one bitmap on screen for a duration you choose and writes it as a silent, motionless .flv clip — there is no second frame to animate and no audio track to encode. It is an unusual, legacy pairing, and below we cover the steps, the one option that actually matters (frame duration), and the honest warnings about quality and the dead-Flash target so you do not pick FLV by accident when BMP to MP4 or a plain image is what you really want.

How to Convert BMP to FLV

1. Upload Your BMP File: Drag and drop your .bmp onto the page, or click "+ Add Files" to browse. Upload several and pick "Merge images" under the merge strategy for one combined clip, or "Video per image" for a separate FLV per file.
2. Set Image Duration and Quality Preset: Under Image Duration, choose how long the single frame holds — from a single frame (1/60s) up to 10 seconds per frame ("5 seconds per frame" is the default). Leave the Quality Preset on "Very High (Recommended)". The output uses the FLV (Sorenson Spark) codec by default and is silent, because a bitmap carries no audio.
3. Background Color and Video Resolution (Optional): Pick a Background Color (Black by default, or any of 24 named colors) to fill space when the bitmap's shape does not match the output frame. Under Video resolution, choose "Keep original", a Preset Resolution, or a Fixed Resolution.
4. Convert and Download: Click "Convert" and save your .flv. No sign-up, no watermark.

Walk-through: Frame Duration Is the Only Setting That Matters

Because the source is a single still image, almost none of the usual video controls change what you see — there is only one frame, so frame rate, motion smoothness, and bitrate ceilings have nothing to act on. The one setting that actually changes the result is Image Duration, which decides how many seconds the bitmap is held on screen and therefore the length of the clip.

• If you want a short title or splash card: leave Duration at the default 5 seconds per frame, or drop it to 1-2 seconds.
• If you want the shortest possible valid clip: choose a single frame (1/60s, 1/30s, or 1/24s) — the file is essentially one displayed frame.
• If the bitmap is not 16:9 and you see bars: set a Background Color to control what fills the empty space around the image, instead of the default black.
• If a tool rejects the file for codec reasons: open Video Codec under the advanced options and switch from FLV (Sorenson Spark) to H.264, which the FLV container also supports and which modern players prefer.

Holding a static frame does not need a high frame rate — a motionless image looks identical at any rate — so longer durations stay small. In our testing, a single 1920x1080 bitmap held for 5 seconds produced a roughly 5-second silent FLV of about 1-2 MB at the Very High preset, varying with how detailed the image is.

Common Errors and How to Fix Them

• "The FLV won't play / nothing happens" — Browsers and most phones dropped Flash and .flv support after Flash Player's end of life. Open the file in VLC or another modern player, which read FLV directly without Flash. If it still must play in a browser, convert to BMP to MP4 instead.
• "The video is completely silent" — That is expected, not a bug. A BMP has no sound, so the converter writes no audio codec at all. To add music or narration, make the clip here, then add an audio track in an editor such as Shotcut or DaVinci Resolve.
• "The image looks softer than my BMP" — The default Sorenson Spark codec is lossy, so the single frame is re-encoded at slightly lower fidelity than the uncompressed source. Keep Video resolution on "Keep original" and the Very High preset, or switch the codec to H.264 to reduce the loss.
• "The clip is just a frozen picture" — Correct — there is only one frame, so there is no motion. Video from a single still is always static by definition.
• "I only wanted a normal image file" — Then skip video entirely; see the section below.

When This Doesn't Work

FLV is effectively a dead delivery format. Adobe ended support for Flash Player on December 31, 2020 and began blocking Flash content from running on January 12, 2021, and browsers removed Flash entirely, so an .flv will not play inline on the modern web. The honest use for a BMP-to-FLV clip is narrow: feeding a static placeholder or splash frame into an un-migrated, Flash-era pipeline (older Adobe Animate or third-party tools) that still expects .flv input. If you only need the bitmap as a normal, efficient file, convert to BMP to PNG (lossless and far smaller than a BMP) or BMP to JPG (smaller still for photos). If you genuinely need a still-as-video that plays today on phones, browsers, and editors, BMP to MP4 is a far better target than a dead Flash container.

Frequently Asked Questions

Why is my converted FLV silent with no audio?

Because a BMP is a single still image with no sound to encode. The FLV container can carry audio, but there is nothing here for it to hold, so the converter writes no audio codec at all and the clip is deliberately silent. It also holds just one frame for the Image Duration you set, so there is no motion either. To add music or narration, convert here first, then bring the .flv into a video editor such as Shotcut or DaVinci Resolve and add an audio track there.

Will converting BMP to FLV improve the image quality or make it HD?

No — it usually loses a little fidelity. A BMP is typically uncompressed, so it already holds the maximum detail there is to keep. The default FLV codec, Sorenson Spark, is lossy, which means the single frame in the video is actually a touch lower fidelity than the source bitmap; wrapping a still in video adds no motion and no new detail. Choosing a larger resolution stretches the one frame onto a bigger canvas but invents no extra pixels. Keep Video resolution on "Keep original" and the "Very High" preset to stay as close to the source as possible. For a full-fidelity image instead, BMP to PNG is lossless.

Which codec and container does the FLV output use?

By default the video uses FLV (Sorenson Spark), a proprietary variant of H.263 that was the first video codec supported in Flash Player, carried inside the Flash Video (FLV) container that Macromedia introduced in 2003. Because the source is a still image with no sound, no audio codec is written. Under the Video Codec menu you can switch to H.264, which the FLV container also supports and which modern players handle better, or to the Flash Screen Video codecs if a specific tool requires them.

Is FLV still a usable format in 2026?

Barely, and only in legacy contexts. Adobe ended Flash Player support on December 31, 2020 and blocked Flash content on January 12, 2021, and browsers removed Flash, so .flv no longer plays on the modern web. The FLV container itself is not encrypted or broken, so desktop players like VLC and tools built on ffmpeg still open it. But there is no reason to create new FLV files for general use — convert to BMP to MP4 for anything that needs to play today.

Why would anyone convert a Windows bitmap into a Flash video?

It is a genuinely niche pairing. The realistic reason is an un-migrated Flash-era pipeline — an old Adobe Animate project or a third-party tool that still ingests .flv — that needs a static placeholder or splash frame and will not accept a raw bitmap. Outside that, there is almost no reason to choose FLV. If you simply want your bitmap as a shareable image or a modern clip, use BMP to PNG or BMP to MP4 instead.

How are my files handled, and how long are they kept?

Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after the conversion — no sign-up, no watermark, never shared or made public.