Video Size Converter

A fast, free online tool that estimates and reduces video file size by adjusting encoding parameters for common formats.

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About This Tool

The Video Size Converter is a prediction tool that helps organizations plan how encoding changes affect file size for web and mobile delivery. It targets content creators, media teams, educators, and marketers who need to fit size caps or reduce bandwidth use when distributing video. The tool accepts duration, original size, and encoding choices to forecast output size. It uses a rate-distortion style model, with defaults for common presets, and yields a clear estimate of required bitrate and resulting file size. The model considers video and audio streams and applies a codec efficiency factor to account for gains from encoders like HEVC. It does not perform actual encoding; it provides guidance that can be validated by a real encode run. This tool is particularly helpful for social media planning, email campaigns, or CDN-ready deliveries, where tight size budgets are common. Unique value lies in transparent parameter-driven estimation, enabling what-if scenarios before committing to a full encode. Typical use cases include trimming a clip to meet a 5 MB limit for a social post or selecting a resolution that keeps streaming requirements within a target bandwidth. By adjusting target_codec, resolution, and bitrate, users can quickly explore trade-offs between quality and size, without running time-consuming encodes. The output is designed to be actionable, with recommended settings that align with target size goals and platform constraints.
The model remains conservative about unknowns, providing safe estimates that can be refined after actual encoding tests.
Overall, it supports planning, budgeting, and risk-free experimentation for media teams.

How to Use

  1. Provide inputs: duration_seconds, original_size_mb, and target_codec;
  2. Optionally set target_bitrate_kbps, target_resolution, and keep_audio;
  3. Run calculation to generate estimates;
  4. Review outputs: estimated_size_mb, estimated_bitrate_kbps, and estimated_duration_seconds;
  5. If needed, adjust inputs to meet a target size and re-run.
How to use video converter lower size

Frequently Asked Questions

Find Quick Answers

What inputs are required?
Required inputs are duration_seconds, original_size_mb, and target_codec. Optional inputs include target_bitrate_kbps, target_resolution, keep_audio, and preserve_aspect_ratio. Providing bitrate or resolution yields more precise estimates; otherwise the tool uses baseline presets.
How is the estimate calculated?
Estimate = duration_seconds × (video_bitrate_kbps + audio_bitrate_kbps) ÷ (8 × 1024). If bitrate is not provided, a resolution-based baseline is used and adjusted by a codec efficiency factor to reflect encoder gains (e.g., HEVC).
Does this tool replace actual encoding?
No. It provides a forward-looking estimate to guide decisions. Real encoding can produce different sizes due to scene complexity, VBR behavior, and container overhead. Use estimates as planning data rather than final results.
Which formats and codecs are considered?
The tool models common video codecs and resolutions, offering guidance for typical web/mobile delivery. It is an estimator, not a converter, and assumes standard presets unless overridden by inputs.

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