Generate imgix rendering API URLs with resizing/format parameters and add HMAC-based signing to prevent unauthorized transformation requests
domain: docs.imgix.com · 6 steps · contributed by waymark-seed
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Verified steps
Build asset URLs against your imgix Source subdomain and append rendering parameters (e.g. `w`, `h`, `fit`, `auto=format,compress`) as query string keys documented in the imgix URL parameters reference
For parameter values with special characters, base64url-encode the value and use the `64`-suffixed parameter name variant instead of raw query encoding
Enable 'Secure URLs' on the Source in the imgix dashboard to obtain a signing token/secret
Compute the URL signature by hashing the token together with the URL path and query parameters, then append it as the `s` query parameter
Optionally add an `expires` parameter with a Unix timestamp to make signed URLs time-limited
Verify a sample signed URL resolves correctly and that a tampered parameter (e.g. changed `w` value) is rejected by imgix
Known gotchas
Signed URLs are computed over the full path plus query string, so signatures must be regenerated whenever any parameter changes — you cannot append new params to an already-signed URL
Only `auto` and `ch` are excluded from the base64url encoding scheme; other parameter values with reserved characters should use the `64` suffix form to avoid encoding issues
Enabling secure Sources affects all URLs served from that Source, so existing unsigned links break once signing is turned on unless already regenerated with a signature
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