The Tool Desk
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Choose the option that matches what you need to compress
| Option | Who operates it | Where it works | Best fit |
|---|---|---|---|
| Managed CDN compression | CDN provider | At the network edge | Site owners who already use a CDN or want a provider to handle compression |
| Web-server compression | Site owner | At the origin server | Operators who control their server configuration and want to keep the compression layer in their stack |
| Image optimization | Site owner or image service | During image delivery or transformation | Sites where image size is the specific bandwidth concern |
| Shared-dictionary compression | Site owner or application/platform provider | For compatible, versioned assets | Specialized delivery of new asset versions to returning browsers |
These approaches are not interchangeable. Text-response compression targets formats such as HTML, CSS, and JavaScript; image workflows resize or re-encode images; shared dictionaries are an additional technique for certain versioned assets. There is no supported universal performance ranking among the options.
Use a managed CDN to compress at the edge
Cloudflare
Cloudflare documents Brotli and Gzip compression for text-based assets at its edge. Its Compression Rules let operators tailor compression by file type and content type. The relevant DNS record must be proxied through Cloudflare for a rule to apply. Cloudflare lists the feature for Free, Pro, Business, and Enterprise plans, with plan-specific rule limits; check its current Compression Rules documentation for limits before configuring a site.
Fastly
Fastly documents both GZip and Brotli at the edge. With static compression, Fastly can take uncompressed content from the origin, compress it, and cache the resulting object for compatible requests. Its documentation also covers dynamic compression for content that cannot be cached. This separates compression from the origin server, but the cited material does not establish that Fastly is faster or less expensive than another provider for a particular site.
#1 Best Overall
Keep compression on your web server
NGINX
NGINX documents response compression using gzip on;. Its default MIME type is text/html, so operators need to specify other desired types. Requests considered proxied may also require separate gzip_proxied configuration. NGINX cautions that runtime compression consumes processing capacity and can affect performance. See the NGINX gzip module documentation for the available directives.
Apache HTTP Server
Apache provides the mod_brotli module for Brotli compression. The module adds Vary: Accept-Encoding, allowing caches to distinguish representations served according to a client’s encoding support. The Apache mod_brotli documentation describes its configuration.
Rank #2
- Used Book in Good Condition
Origin compression is a reasonable fit when you manage the web stack and prefer to control the configuration yourself. The documentation cited here does not provide a cross-server performance comparison, so do not assume one server module is inherently faster than another.
Use image optimization for image-heavy traffic
Cloudflare Images documents on-the-fly resizing and conversion to WebP or AVIF for browsers that support those formats, with fallback for others. Its transformation workflows can be configured with URL parameters or Workers; its Polish feature compresses existing images. See Cloudflare’s image transformation documentation and Polish documentation.
These tools address image delivery, not general HTTP response compression. They complement a text-compression setup when images are the main source of large transfers; they do not replace compression for HTML, CSS, JavaScript, or other text responses.
Consider shared dictionaries only for compatible versioned assets
Shared-dictionary compression can encode a new version of an asset as a delta against a dictionary already available in a returning browser. Cloudflare’s guide describes using a reverse proxy or native application-server support, with fallback to ordinary Brotli, Zstandard, or Gzip when the browser does not advertise the necessary dictionary support or the dictionary hash does not match. It is a specialized optimization, not a baseline replacement for ordinary compression. See Cloudflare’s shared-dictionary guide.
Rank #4
Check negotiation, caching, and CPU impact
- Encoding negotiation: Clients advertise supported encodings in
Accept-Encoding. Ensure the compression layer and any caches handle the appropriate representation for each request. Apache’s Brotli module addsVary: Accept-Encoding; Cloudflare documents compression and cache behavior in its Compression Rules documentation. - Response transformations: Cloudflare notes that enabled response-changing features can require decompression and recompression. Its compression documentation describes
Cache-Control: no-transformfor responses that should not be transformed. Review the Cloudflare content compression documentation when configuring those features. - Origin workload: Runtime compression can use CPU. After enabling it, inspect response headers for representative URLs and monitor server load under normal traffic rather than assuming a configuration directive is active for every response.
- Already-compressed media: Many image, audio, and video formats are already compressed, so generic GZip or Brotli usually is not the right way to reduce their size. Fastly’s compression guide explains the distinction.
Actual savings and performance depend on the content, configuration, cache behavior, and workload; the sources cited here do not establish a percentage reduction or a universal speed improvement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.If you mean a proxy for personal browsing
A forward proxy that compresses traffic for an individual’s general web browsing is not the same product category as a CDN or server-side compression module. The options above assume you operate a website and control its delivery path. The available material does not establish a current, well-supported catalog of consumer services or projects for compressing arbitrary browsing traffic, so it would be misleading to present these website tools as direct substitutes.
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