Free video tools

Small tools for the jobs around a video ad. They're free, need no sign-up, and run in your browser, so nothing is uploaded.

• Video ad script timer

  Paste a video ad script and see how long it takes to say, whether it fits 6, 15, 30 or 60 seconds, and how many words each length allows.

• SRT to VTT caption converter

  Convert caption files between SRT and WebVTT in your browser: paste or drop a file, convert it, and download the result. Nothing is uploaded.

• Video aspect ratio calculator

  Enter your video's size to see its aspect ratio, the largest crop for 9:16, 4:5, 1:1 and 16:9, and the standard HD and 4K output sizes for each.

• Text to SRT converter

  Paste a transcript and split it into caption lines of the length you choose, then download it as an SRT or VTT file with estimated timings.

• Video file size and bitrate calculator

  Work out a video's file size from its length and bitrate, or the bitrate to export at so it fits a size limit. With YouTube's recommended bitrates.

• Online teleprompter

  A free teleprompter in your browser: paste your script, set the speaking pace and text size, mirror it for a glass, and go full screen while you record.

• YouTube chapters generator

  Paste your timestamps and get a YouTube chapter list ready for the description, checked against YouTube's rules: 00:00 first, three or more, 10 seconds each.