Video Resolution Scaler
Draws browser-decoded frames directly to the requested canvas dimensions and records 30 fps WebM through MediaRecorder. Direct scaling can stretch the picture; there is no aspect-ratio, bitrate, or codec control.
About this video resolution scaler
Redraws video frames to canvas scaled to target dimensions and re-encodes to WebM via MediaRecorder.
How this tool works
Implements client-side Video Resolution Downscaler operations. Redraws decoded video frames to a canvas scaled to requested target width and height (rounded to even values), and re-encodes the stream to WebM via browser MediaRecorder API.
- Video Element Ingestion: Loads local video into a hidden HTML5 video object to extract metadata and decode frames.
- Synchronized Frame Seeking: Seeks across calculated timestamp intervals using asynchronous seeked event promises.
- Canvas Rendering & Scaling: Renders frames to a Canvas 2D context scaled to requested dimensions, which may result in stretching if non-proportional.
- MediaStream & GIF Encoding: Records the running canvas stream to WebM via MediaRecorder or quantizes frames to up to 256 colors for GIF compilation.
Worked example
Scenario: A web developer resizes a video to target dimensions for local preview.
Sample input:
Processing: Draws browser-decoded frames directly to a 1280x720 canvas (each requested dimension becomes an even integer with a minimum of 2), so it can stretch or upscale without letterboxing; captures at 30 fps, retains source audio only when captureStream exposes tracks, and uses the first supported VP9/Opus, VP8/Opus, or generic WebM MediaRecorder MIME type.
Illustrative output:
Limits and verification
A file must be decodable by the current browser; codec and container support varies by browser and platform. MediaRecorder outputs WebM, and GIF compilation does not enforce strict file-size limits or maximum durations.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the Video Resolution Scaler workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
How does Video Resolution Scaler work in this implementation?+
It draws decoded frames directly to a requested-width and requested-height canvas, rounds each canvas dimension to an even integer with a minimum of 2 pixels, captures it at 30 fps, conditionally adds source audio tracks, and records WebM with the first supported VP9, VP8, or default MediaRecorder MIME type.
Which controls does Video Resolution Scaler actually provide?+
The visible controls are one video-file picker, Width, Height, and Process locally. Width and height show a 1–4096 UI range, then the render path applies only the even-number/minimum-2 canvas rule. There is no aspect-ratio, crop, letterbox, bitrate, codec, frame-rate, or audio control.
Which input and output limits apply to Video Resolution Scaler?+
Direct scaling can stretch a picture when target and source aspect ratios differ. Output is WebM, not the original container, and depends on browser decoding and MediaRecorder support. File size, bitrate, exact codec, duration fidelity, and every input format are not guaranteed.
Is the selected video submitted when using Video Resolution Scaler?+
In isolated-browser evidence, recorded requests contained no submitted tool payload. This concerns the selected video and processing request path; ordinary page assets are separate. The selected file is decoded in the browser before WebM is made.