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A2Z Video Tools

Simple Video Tools for Your Own & Authorized Content

A2Z Video Tools provides simple utilities for managing, converting and working with video content you own or are authorized to use.

Only use A2Z Video Tools with content you own, content in the public domain, or content you have permission to download, save, convert or use. Users are responsible for complying with applicable laws and the terms of the source platform.

The tools

Everything runs in your browser. No account, no upload, no waiting on a queue.

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Video File Size Calculator

Work out how large a video will be

Open tool

Video Bitrate Calculator

Find the bitrate to fit a size limit

Open tool

Aspect Ratio Calculator

Resize without distorting

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Frame Rate and Timecode Calculator

Convert between frames, seconds and timecode

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Compression Estimator

See what a target size costs you

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Resolution Reference

Look up any common resolution

Open tool

Black Hole A2Z Android App

Black Hole A2Z is our Android media utility designed to help users manage and work with their own or authorized video content. It is a separate piece of software from this website, and the website works fully without it.

Official app information
Download Black Hole A2Z

Version 1.2.2, distributed directly by the developer rather than through an app store. Android only.

Reading on video

How formats, bitrates and codecs actually behave, written for people who have to make a decision rather than pass an exam.

All articles

Rights

Why Some Websites Do Not Allow Video Downloads

The licensing, business and technical reasons behind a missing download button, and what the absence of one actually means.

2 min read

Rights

Creative Commons Video: What the Licences Actually Allow

The six licences, what each condition means in practice, and how to attribute properly so the permission holds.

2 min read

Rights

Public Domain and Copyrighted Content: Telling Them Apart

What public domain actually means, how works get there, and why free to watch is not the same thing at all.

2 min read

Rights

Copyright Basics for Online Video Creators

A plain overview of who owns what, what permission actually means, and the assumptions that get creators into trouble.

3 min read

What this site is for

Most questions about video come down to arithmetic that nobody wants to do by hand. How big will this be? What bitrate fits under the limit? What height keeps the shape if the width changes? The tools here answer those, and each one explains the working rather than just producing a number, because the explanation is what stops you needing the tool next time.

There is a deliberate boundary. These tools work on content you own, content in the public domain, or content you have permission to use. Nothing here is designed to get around a platform's restrictions, a paywall or a technical protection measure, and nothing here will help with that. The copyright policy sets out where the line sits and why.