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ReSmush.it vs The Office API

Same instrument, two spec sheets — measured, not claimed.

APIReSmush.itNEW—The Office APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseN/A — optimization service, not a datasetUnverified
Free tierFree; per-image size cap applies (see docs)Free — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ReSmush.it vs The Office API: common questions

Which is more reliable, ReSmush.it or The Office API?

On our scheduled checks, The Office API leads on measured uptime — ReSmush.it at —% versus The Office API at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do ReSmush.it and The Office API need an API key?

Neither needs a paid key — ReSmush.it is callable with no signup, and The Office API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ReSmush.it and The Office API from the browser?

Only The Office API is browser-friendly — it returns CORS headers over HTTPS. ReSmush.it needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are ReSmush.it and The Office API free for commercial use?

ReSmush.it has unclear commercial terms, and The Office API has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.