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.
All the tools
No account, no watermark, nothing to install. The icons are there so you can find a tool at a glance.
Black Hole A2Z for Android and Windows
Black Hole A2Z is a media utility for managing and working with your own or authorized video content, built for a phone and for a desktop. It is separate software from this website, and the website works fully without it.
Version 1.4.0. Distributed directly by the developer rather than through an app store.
Version 1.1.0. Distributed directly by the developer rather than through an app store.
Reading on video
How formats, bitrates and codecs actually behave, written for people who have to make a decision rather than pass an exam.
Voice and audio
Using Text to Speech for Tutorial Videos That People Finish
Tutorials live or die on clarity. How to script, pace and structure a generated narration so a viewer can follow along with the screen.
3 min read
Voice and audio
Pacing and Pauses: Making Narration Sound Like a Person
A generated voice that never breathes is tiring to hear. How punctuation, short sentences and line breaks shape the rhythm of narration.
3 min read
Voice and audio
Making Text to Speech Say Numbers, Dates and Acronyms Correctly
Generated voices read exactly what is written, which is the problem with 2026, NASA and 3/4. How to write a script so the voice says what you meant.
3 min read
Sharing and delivery
How to Write Subtitles People Actually Read
Most video is watched without sound, so the subtitles are the video. Line length, timing and the difference between a transcript and a subtitle file.
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.