Tools

Free CDN and caching tools

Small, focused utilities for the parts of delivery work that are hard to eyeball. No sign-up, no rate card, nothing to install.

• Cache-Control generatorBuild the header from toggles, read what every directive actually does, and catch the combinations that silently cancel out — no-store beside a long max-age, immutable on a URL that can change.
• Bitrate ladder calculatorAn ABR ladder for your source, codec, and content type — per-rung bitrates, a ready ffmpeg command, and what it costs in storage per hour and egress per 1,000 viewer-hours.
• HLS & DASH manifest checkerParse an .m3u8 or .mpd: the real ladder, codecs, segment durations, and audio groups — plus the absences that break playback, like missing CORS or a media group nothing defines.
• Cache hit ratio calculatorA miss is billed twice — once to pull from origin, once to deliver. See what your hit ratio costs per year, and why free-egress origins change the answer entirely.
• Cache header checkerEnter any public URL to see its Cache-Control, ETag, Age, and Vary headers, which CDN is answering, and what is quietly stopping the response from being cached.
• CDN cost calculatorCompare monthly egress cost across CloudFront, Fastly, Akamai, Google Cloud CDN, KeyCDN, and CDN77 at your traffic volume, tier by tier.
• HTTP status code referenceEvery status code with what it means behind a CDN — which ones a shared cache stores by default, and the Cloudflare 520–530 family that is not standard HTTP at all.

Looking for the deeper write-ups instead? The engineering blog covers caching, HLS delivery, and CDN cost in detail.