Difficulty: Easy
Description
CloudFront distributions with compression disabled transfer uncompressed assets to end users, unnecessarily increasing CloudFront Data Transfer Out costs. Enabling compression (Gzip and Brotli) on cache behaviors reduces the size of compressible objects (HTML, CSS, JS, JSON, XML, SVG, etc.) by 65–80%, resulting in an equivalent reduction in billable data transfer volume — with zero changes to your origin or application code.
Selection Criteria
The CloudFront distribution has at least one cache behavior with
Compress objects automaticallyset tofalse.The cache behavior uses a cache policy with a TTL > 0 (compression requires caching to be active).
The distribution serves compressible content types (text/html, text/css, application/javascript, application/json, image/svg+xml, etc.).
CloudFront Data Transfer Out costs for this distribution exceed $5/month (minimum threshold to ensure savings are meaningful).
The origin does not already compress all responses (to avoid conflicts with pre-compressed content).
Expected Saving
65–80% reduction on CloudFront Data Transfer Out costs for affected cache behaviors, depending on content type mix.
Example: a distribution transferring 10 TB/month of mixed web assets (HTML, JS, CSS, JSON) could save $3,000–$4,000/year simply by enabling compression. CloudFront charges per GB transferred — every byte saved translates directly into cost reduction.
Compression is applied at the CloudFront edge — no changes to origin infrastructure are required, making this one of the easiest and highest-ROI CloudFront optimizations available.
Operational Impact
✅ No downtime required — enabling compression is a CloudFront configuration change that takes effect within minutes of distribution deployment.
⚠️ Pre-compressed origins : if the origin already sends responses with a
Content-Encodingheader (e.g., gzip), CloudFront will not re-compress — no conflict, but verify the header is correctly forwarded through the cache policy.⚠️ Size limits : CloudFront only compresses objects between 1 KB and 10 MB — small files and already-compressed formats (JPEG, PNG, MP4, ZIP, PDF) are excluded and do not benefit from this setting.
⚠️ Content-Type scope : compression applies only to content types declared as compressible in the cache policy — verify the policy covers all relevant types served by the distribution.