Step 1: Provide your AVI files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted BMP files.
AVI to BMP Conversion FAQ
How do I extract individual frames from AVI as BMP images?
+
Upload the AVI file and the converter exposes a frame-extraction picker: every Nth frame, frames at specific timestamps, or one frame per second. Each chosen frame is decoded from the AVI video stream, encoded as a separate BMP file, and bundled as a ZIP for download. AVI is Microsoft’s Audio Video Interleave, introduced in 1992 on top of the RIFF chunk format — one of the oldest containers still in circulation. BMP is the Windows Bitmap, the raw raster format built into Windows since 1985.
Why do my extracted frames have horizontal lines through them?
+
Because the source is interlaced. AVI content from the broadcast and DVD era stores two half-height fields per frame, captured a fiftieth of a second apart, and a still pulled straight out shows both woven together as combing on anything that moved. Enable deinterlacing before extraction and each still is built from a single reconstructed progressive frame.
Can I get the BMP frames without the subtitles?
+
Only if the AVI never had them burned in, because AVI has no selectable subtitle stream to switch off. Anything an AVI shows on screen is in the picture itself, so it is in every BMP the extraction produces and no setting removes it afterwards. Where a separate subtitle file exists alongside the video, extract from a source that kept the two apart and the frames come out clean. AVI has no native support for modern codecs, variable frame rate, soft subtitles or files over 4 GB without hacks, and its per-chunk overhead bloats the file.
How big will the BMP files be?
+
Larger than you might expect, because BMP keeps every pixel exactly rather than approximating. A 1080p still lands around 2-5 MB and a 4K still around 6-15 MB, so a long extraction run adds up quickly. That is the right trade when the images feed further processing, and the wrong one when they are going straight onto a web page. BMP usually stores completely uncompressed pixel rows with a small header, which is why it is so simple to parse.
Will a very large AVI file upload successfully?
+
Free accounts cap at 100 MB per file, and AVI sources run large because the format carries substantial per-chunk overhead on top of the video data. Premium lifts the cap considerably. If the file is split into numbered parts because of the format ceiling, upload them together and they are treated as one job.
At what resolution do the extracted BMP images come out?
+
Same resolution as the source AVI: a 1080p AVI produces 1920x1080 BMP frames, a 4K AVI produces 3840x2160 BMP frames. The converter does not upscale or downsample — pixel dimensions are pulled straight from the decoded frame. Use /resize-image/ after extraction if you need smaller thumbnails.
Can I extract every frame of an AVI as BMP?
+
Yes, but mind the file count — a 30 fps 1-minute AVI produces 1,800 BMP frames. We pack them into a single ZIP archive automatically. For longer clips, prefer the "1 per second" preset (60 frames per minute) or pick specific timestamps. An hour of AVI at every-frame would produce ~100,000 BMP images.
Will the BMP frames preserve the AVI colour grading?
+
Yes — colour is decoded with the same matrix the source AVI stream advertises (BT.709 for HD, BT.2020 for 4K HDR). HDR sources are tone-mapped to SDR when extracting to a BMP that cannot store HDR pixel ranges natively (JPG, PNG-8). Target high-bit PNG-16 or TIFF if you need to keep extended dynamic range.
How big is one extracted BMP frame on disk?
+
Depends on resolution and BMP codec choice: a 1080p PNG frame is 2-5 MB lossless, a 1080p JPG at quality 85 is 200-500 KB. Multiply by frame count to size the ZIP — at the extreme, every-frame PNG extraction of a 10-minute 1080p AVI is roughly 50 GB and gets split across multiple ZIPs.
Does the extracted BMP keep camera EXIF metadata?
+
An AVI container does not carry per-frame EXIF the way a still camera does, so the BMP files come out with empty EXIF blocks. The converter does embed a `creation_time` field pointing at the source frame timestamp, so you can re-sort the bundle in chronological order or correlate with subtitle / chapter markers.
How long does frame extraction from AVI to BMP take?
+
Frame decoding is fast — typically 20-30% of source duration. A 5-minute AVI -> BMP bundle finishes in about 1 minute regardless of how many frames you pick, because the bottleneck is the BMP encoder writing many small files in parallel, not the AVI demuxer.
Can I extract frames at exact timestamps inside the AVI video?
+
Yes — the advanced timestamp option accepts a comma-separated list (e.g. `00:01:23, 00:05:00, 00:10:42.5`) and produces one BMP file per timestamp. Useful for chapter thumbnails, scene reference shots, or building a contact sheet for review.
