✳ FREE · NO UPLOAD · BROWSER-SIDE
Universal file validator
Pick a video, audio or image file. Get per-platform verdict against 9 platforms - TikTok, Instagram Reels, YouTube Shorts, LinkedIn, X, Facebook, Pinterest, Spotify Canvas, Snapchat Spotlight. Each verdict cites an official platform doc.
1. Pick a file
File stays on your device. Koldflux reads dimensions, duration and size in the browser; nothing is uploaded.
2. Pick target platforms
Defaults: TikTok, Instagram Reels, YouTube Shorts, LinkedIn. Toggle more platforms; verdict updates per platform.
How verdicts are computed
- The browser reads the file metadata (container, MIME, dimensions, duration) - never uploaded.
- For each target platform, Koldflux compares against a sourced constraint registry:
- File size vs. platform max · Duration vs. platform max · Aspect vs. recommended ratio.
- Verdict: PASS (within published limits) · WARNING (within 80% of limit or aspect mismatch) · FAIL (over limit) · UNKNOWN (no sourced record).
- Every verdict carries a source URL + verified-at date.
Coverage
Currently covers 10 (platform × surface × container) constraint cells. The registry is updated quarterly; volatile facts (duration, file-size, caption limits) are re-checked every release.
Verified across 9 platforms in one place. Run the validator before every export.
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