Tools for creators
Check your upload before the platform does.
Free tools for the technical side of publishing videos and podcasts, built with the same care as broadcast delivery checks. Each tool is tagged with the platforms it covers. Drop in your export and get an exact answer, not a rule of thumb. Everything runs in your browser: no sign-up, nothing uploaded, nothing stored.
ACX audiobook checker
- Audiobooks
Drop a whole book: RMS, peak, noise floor and room tone for every file against ACX’s requirements (or Spotify for Authors’), with the fix for each. Nothing uploaded.
Open →TimingCaption reading speed
- YouTube
Drop in your captions (.sbv, .srt or .vtt) and see which lines go by too fast to read, when they appear, and how to fix each one.
Open →PictureColour tag checker
- YouTube
- Shorts
- Reels
- TikTok
Why an export looks washed out: its colour tags in the container and the bitstream, how Chrome, Safari and QuickTime show it (measured), and the setting that fixes it.
Open →TimingMid-roll ad break finder
- YouTube
Drop in your video and get mid-roll ad break times at natural pauses, at the spacing you choose, preferring your chapter starts. Nothing uploaded.
Open →AudioMono compatibility checker
- YouTube
- Shorts
- Reels
- TikTok
- Podcasts
- Audiobooks
Fold a stereo mix to mono and see what it loses, second by second: phase correlation, the worst sections, and dual-mono, one-sided or inverted channels, with the fix.
Open →DeliveryOne export, three platforms
- Shorts
- Reels
- TikTok
Drop one vertical video and see its length, shape, resolution, frame rate, format and size against what Shorts, Reels and TikTok each publish, with sources.
Open →TimingPodcast chapter builder
- Podcasts
Your edit’s markers as podcast chapters: checked against Apple and Spotify, written into the MP3 with the audio untouched, or into show notes and a Podcasting 2.0 file.
Open →PicturePodcast cover art checker
- Podcasts
Show, episode and chapter art against Apple’s and Spotify’s requirements (square, 1400–3000 px, no transparency), then at the sizes the apps draw it.
Open →DeliveryPodcast episode file checker
- Podcasts
Format, bitrate, sample rate, channels, length and tags against what Apple Podcasts and Spotify publish, with the source for each. Catches VBR MP3s that show the wrong length.
Open →AudioPodcast loudness checker
- Podcasts
Drop in your episode and check its loudness and true peak against Apple Podcasts’ −16 LKFS, with the gain to fix it. MP3s of any length; nothing uploaded.
Open →PictureReels & TikTok covers
- Reels
- TikTok
Check a Reels cover against Instagram’s requirements, and see a cover or TikTok frame the way each app’s profile grid crops it.
Open →AudioRoom tone & noise floor meter
- Podcasts
- Audiobooks
Your recording’s noise floor in dB RMS and LUFS, every pause with its level, dead air where an edit went silent, and the level of any stretch you drag across.
Open →PictureSafe zones for Shorts, Reels & TikTok
- Shorts
- Reels
- TikTok
Where each app covers a vertical video (measured in the apps), the area safe on all the platforms you post to, and a transparent overlay to download.
Open →PictureShorts safe zones & thumbnails
- YouTube
- Shorts
Where Shorts buttons and titles cover the picture (measured, with a transparent overlay to download), and a thumbnail check against YouTube’s requirements.
Open →DeliveryTitle, description & tag checker
- YouTube
Title, description and tags against YouTube’s limits, counted the way YouTube counts them, with a preview of where the title gets cut off in search.
Open →DeliveryUpload time & size
- YouTube
How big your upload will be and how long it takes on your connection: at YouTube’s recommended bitrate, your own export, or ProRes. Or drop the file itself.
Open →DeliveryVideo podcast checker
- YouTube
- Podcasts
One video episode against Spotify’s video specs and YouTube’s upload settings side by side: keyframes, interlacing, A/V length, edit lists, codecs.
Open →TimingYouTube chapter checker & builder
- YouTube
Find the line that stops YouTube showing your chapters, or build a correct chapter list from Final Cut, Resolve or Premiere markers.
Open →AudioYouTube loudness checker
- YouTube
Drop in a video or audio export: integrated LUFS and true peak per BS.1770, and how much YouTube will turn it down (or why it will play quiet). Nothing uploaded.
Open →DeliveryYouTube upload checker
- YouTube
Drop your export and check it against YouTube’s recommended upload settings: Fast Start, edit lists, H.264 profile and GOP, interlacing, bitrate, colour and audio.
Open →Measurements follow the published standards each tool names. Where a figure is a platform’s, it comes from that platform’s own documentation, and where the platform hasn’t published one, the tool says so and tells you where the number comes from instead.
By platform: Tools for YouTube creators · Tools for Shorts, Reels and TikTok · Tools for podcasters · Tools for audiobook narrators. Delivering to a broadcaster instead? Broadcast, streaming & post tools.