Video Size Reducer

A scalable online tool that downsizes video files by adjusting resolution and bitrate, targeted at content creators, educators, and social media users.

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About This Tool

This tool analyzes a source video's duration, original resolution, and codec and produces recommended downscale settings to meet target file size or bandwidth constraints. It accepts duration, original resolution, target resolution, target video bitrate, audio bitrate, codec, and frame rate preferences. It outputs estimated final size, suggested presets, and a conversion plan.

Conceptually, size is driven by duration and bitrate, with resolution influencing pixel data and perceived quality. The tool applies a proportional model: target_size ≈ duration_in_seconds × (video_bitrate + audio_bitrate) / 8, adjusted for encoding overhead. It supports common codecs (H.264/AVC, H.265/HEVC) and containers (MP4, MKV) and offers presets to trade quality for size.

Who benefits: content creators, educators, marketers, and teams distributing video via social platforms or email, where storage and bandwidth are constrained. Unique value: instant size estimates, auto-suggested parameters, and batch-ready profiles for multiple files via API.

Core features: size estimation, resolution downscaling, bitrate and audio bitrate control, optional frame rate reduction, encoding preset selection, export-ready configuration. Use cases: reduce long lecture recordings for LMS, compress promotional clips for social, or generate cutdowns for email.

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How to Use

Provide inputs: duration, original_resolution, target_resolution, video_bitrate_kbps, audio_bitrate_kbps, codec, container.
Select target quality and codec preset: choose a balance between quality and size.
Run calculation: obtain estimated_size and recommended settings.
Review outputs: verify the conversion_plan and adjust inputs if needed.
Start export: apply suggested settings and run the encoder, then download the result.

Frequently Asked Questions

Find Quick Answers

What inputs are required?

Required inputs include duration in seconds, original resolution (width x height), target resolution, target video bitrate, target audio bitrate, chosen codec (H.264/AVC or HEVC), and container. Optional frame rate can refine quality and size estimates.

What outputs are provided?

The tool provides an estimated final file size, a recommended parameter set (resolution, bitrate, codec), and a concrete conversion plan you can apply to the exporter or API.

How is the size estimated?

Size estimation uses duration × (video_bitrate + audio_bitrate) divided by 8 to convert bits to bytes, with an overhead factor to account for container metadata and encoding inefficiencies. It is a heuristic but aligned with common encoders.

Which formats and codecs are supported?

Supported output containers include MP4 and MKV with codecs such as H.264 and HEVC. Audio can be AAC or equivalent. The tool focuses on widely compatible configurations suitable for web and mobile delivery.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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