What's the difference between 'every N seconds' and 'N frames'?

'Every N seconds' extracts a frame every N seconds from the start. A 10-minute video at 5-second intervals = 120 frames. Good for long videos where you want lots of frames. 'N frames' splits the duration into N equal parts and grabs one frame from each midpoint. A 10-minute video × 12 frames ≈ one frame per 50 seconds. Good for storyboard / preview overviews of an entire clip.

How is this different from video-thumbnail?

video-thumbnail extracts a single frame from one specific timestamp. This tool extracts multiple frames at regular intervals or evenly-spaced positions. Pick video-thumbnail when you need one frame, this tool when you need several.

How are output filenames structured?

` -frame -at .png`. NNNN is a 4-digit zero-padded index (0001, 0002, …) and seconds has one decimal. Example: `holiday-trip-frame0042-at12.5.png`. The source extension is stripped and special characters are replaced with `_`.

What's the max frame count per video?

500. Settings that would exceed this (e.g., a 10-hour video at 1-second intervals = 36000 frames) produce an error. Widen the interval, lower the count, or split the video with video-cut first.

Yes, PNG only — to keep frames lossless. If you need JPEG / WebP, run the PNGs through image-convert afterwards.

Which video formats are supported?

Anything ffmpeg.wasm can read: MP4 / MOV / M4V / WebM / MKV / AVI / FLV / WMV / 3GP / TS etc., with codecs including H.264 / H.265 / VP8 / VP9 / AV1 / MPEG-2 / MPEG-4. If a file fails, convert it to MP4 (H.264) with video-convert first.

Is anything uploaded?

No. ffmpeg.wasm runs inside your browser (WebAssembly); video files and extracted frames stay local. Only the ffmpeg wasm core itself is downloaded on first use.

Back to Video

Video Frame Extract — interval or evenly-spaced PNG sequence export

Extract multiple frames from a video as a PNG sequence — either every N seconds or N evenly-spaced frames. The multi-frame sibling of video-thumbnail (which grabs a single frame). Useful for storyboards, video analysis, and asset capture. ffmpeg.wasm runs inside your browser and supports MP4 / MOV / WebM / MKV / AVI and more. Two modes: 'interval' (every N seconds) and 'count' (M evenly-spaced frames). Per-video ZIPs and a combined ZIP are both available. Files are named `<source>-frame<NNNN>-at<seconds>.png`. Nothing is uploaded.

videoimageextract

How to use

1) Pick a mode: 'Every N seconds' or 'N evenly-spaced frames'. The numeric input below changes per mode. 2) Drop one or more video files (mp4 / mov / webm / mkv / avi …). Duration is auto-detected. 3) Press 'Extract frames' — ffmpeg.wasm initialises (first-time download ≈ 30 MB) and processes each video in turn. 4) Frame thumbnails appear per video. Download per-video ZIPs or a combined ZIP of every video.

FAQ

What's the difference between 'every N seconds' and 'N frames'?: 'Every N seconds' extracts a frame every N seconds from the start. A 10-minute video at 5-second intervals = 120 frames. Good for long videos where you want lots of frames. 'N frames' splits the duration into N equal parts and grabs one frame from each midpoint. A 10-minute video × 12 frames ≈ one frame per 50 seconds. Good for storyboard / preview overviews of an entire clip.
How is this different from video-thumbnail?: video-thumbnail extracts a single frame from one specific timestamp. This tool extracts multiple frames at regular intervals or evenly-spaced positions. Pick video-thumbnail when you need one frame, this tool when you need several.
How are output filenames structured?: `<source>-frame<NNNN>-at<seconds>.png`. NNNN is a 4-digit zero-padded index (0001, 0002, …) and seconds has one decimal. Example: `holiday-trip-frame0042-at12.5.png`. The source extension is stripped and special characters are replaced with `_`.
What's the max frame count per video?: 500. Settings that would exceed this (e.g., a 10-hour video at 1-second intervals = 36000 frames) produce an error. Widen the interval, lower the count, or split the video with video-cut first.
PNG only?: Yes, PNG only — to keep frames lossless. If you need JPEG / WebP, run the PNGs through image-convert afterwards.
Which video formats are supported?: Anything ffmpeg.wasm can read: MP4 / MOV / M4V / WebM / MKV / AVI / FLV / WMV / 3GP / TS etc., with codecs including H.264 / H.265 / VP8 / VP9 / AV1 / MPEG-2 / MPEG-4. If a file fails, convert it to MP4 (H.264) with video-convert first.
Is anything uploaded?: No. ffmpeg.wasm runs inside your browser (WebAssembly); video files and extracted frames stay local. Only the ffmpeg wasm core itself is downloaded on first use.

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