Free tools
Free YouTube and video tools
Small, free tools for creators and editors from Mark Studios. No sign-up, no email.
YouTube thumbnail checker
Check a thumbnail against YouTube’s 2026 specs and preview it on the home feed, in search, in Up next and on a phone. Your image never leaves your device.
Video file size calculator
How big a video will be from its length and bitrate, or the bitrate that fits a size limit, with YouTube’s recommended bitrates built in.
Free YouTube channel audit
Paste any public channel to see its real numbers, its latest uploads and the three things most worth knowing about it, in seconds.
Looking for templates and checklists? Free resources·Numbers with sources: Research & statistics
Rather hand it off?
Thumbnails, edits and channel strategy, and you work directly with Mark Santos.