Tools
Video tools that run in your browser
Calculators for the arithmetic that decides how a video turns out, and two readers that work on files you choose from your own device. Nothing is uploaded and nothing needs an account.
YouTube Thumbnail Downloader
Paste a YouTube link and download the video's thumbnail in every size YouTube stores, up to full HD. For your own videos and thumbnails you have permission to use.
Text to Speech Voiceover
Type or paste a script, choose from over three hundred male and female voices in 140 languages, and download natural-sounding speech as an MP3.
Logo Maker
Make a simple, sharp logo from your initials or a short word: pick a shape, colours and font weight, and download a 1024 x 1024 PNG. All in your browser.
Channel Banner Maker
Design a YouTube channel banner at the full 2560 x 1440 size, with the safe area drawn on screen so your name and tagline survive every crop, from TV down to phone.
Thumbnail Maker
Design a YouTube-ready thumbnail in your browser: background colour or your own image, bold headline text with an outline, and a PNG export at exactly 1280 x 720.
YouTube Transcript Downloader
Paste a YouTube link and download its captions as plain text or SRT subtitles, when the video has captions available. Useful for notes, translations and editing your own videos.
Video File Information
Choose a video on your own device and read its duration, dimensions, aspect ratio, file size and reported type. The file is read in your browser and never uploaded.
Frame Extractor
Choose a video on your own device, move to any moment, and save that frame as a PNG or JPEG. Everything happens in your browser and the video is never uploaded.
Video File Size Calculator
Estimate the file size of a video from its bitrate and duration, or work backwards from a size limit to the bitrate you can afford.
Video Bitrate Calculator
Given a target file size and a duration, work out the video and audio bitrates that will fit, with the audio track accounted for properly.
Aspect Ratio Calculator
Scale a width or a height while keeping the same shape, check what ratio a resolution actually is, and see the nearest common ratio.
Frame Rate and Timecode Calculator
Convert a duration into a frame count at any frame rate, turn frames back into timecode, and see what changing the frame rate does to length.
Compression Estimator
Compare an original file against a target size and see the bitrate per pixel you would be left with, which is what actually decides whether the result still looks acceptable.
Resolution Reference
A searchable reference of standard video resolutions with their pixel counts, aspect ratios and how they relate to one another.
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.
Why there is no converter here
Converting or compressing a video means decoding every frame and encoding it again. In a browser that requires a WebAssembly build of an encoder, which is roughly a 25MB download before anything starts, and then runs slowly enough on a phone that a few minutes of footage can take longer than the footage itself.
Shipping that and calling it a converter would technically be true and practically useless, so it is not here. What is here instead is everything needed to decide the settings before you convert: the size a given bitrate produces, the bitrate a size limit allows, and whether that bitrate is realistic for the resolution. The format guide covers doing the conversion itself with tools built for it.
Nothing leaves your device
The calculators are arithmetic and need no file at all. The two file readers use the browser's own video engine on a local reference to a file you pick. There is no upload endpoint on this site, which is a stronger guarantee than a promise not to look: there is nowhere for a file to go.