Plan a useful frame sample
The video frame sampling guide explains interval, requested FPS, and fixed-count extraction with formulas and worked examples. Use it when you need a contact sheet, dataset sample, review sequence, or a repeatable set of frames from a known time range.
It also explains why a requested sampling rate is not the same thing as the source video's frame rate, and how to stay within the converter's 240-image safety limit without missing the part of a clip that matters.
Capture one exact moment honestly
The exact video frame guide covers timestamps, keyframes, variable frame rate, browser seeking, and the difference between visual selection and forensic frame indexing. It includes a repeatable workflow for checking nearby frames before export.
Use it for animation review, software bug evidence, sports movement, presentation slides, and any task where a neighboring decoded frame may be visibly different.
Diagnose containers and codecs
A file extension identifies a container, not necessarily the video codec inside it. The video codec and container guide shows why one MP4 opens while another does not, how to distinguish file, browser, and URL failures, and which facts to record in a useful compatibility report.
The guide links to current browser media documentation and keeps its recommendations deliberately conservative: H.264 in MP4 and broadly supported WebM combinations remain the most reliable first choices for browser playback, while support for HEVC, AV1, MOV, MKV, and AVI varies by platform and file details.
Choose an image format after decoding
The PNG, JPG, and WebP guide separates source-video quality from still-image encoding. It explains why PNG cannot restore detail already removed by video compression, when JPG artifacts are acceptable, and when WebP is worth a compatibility check.
A practical test method compares the same decoded frame at the intended display size, so the decision is based on visible edges, gradients, and file weight rather than format folklore.
How these guides are produced
These guides document the behavior of VideoToImg's browser-based extraction engine and the web media APIs it relies on. Examples are written for the controls available on this site and checked against current browser documentation. They do not claim frame-accurate forensic decoding or universal codec support.
Corrections and reproducible compatibility reports are welcome at hello@videotoimg.com. Include the browser, operating system, container, codec when known, duration, and the smallest set of steps that reproduces the result. Do not attach private source videos.