GZIP vs Brotli Savings Estimator
Paste any text payload to compare GZIP and Brotli compression savings side by side — JSON, HTML, CSS, JavaScript, XML, or plain text. GZIP results are exact using the browser's native CompressionStream API; Brotli results are estimated using Google's published benchmarks (RFC 7932). The bandwidth savings panel shows daily savings at 1K and 1M requests, making it easy to justify upgrading from GZIP to Brotli on your server or CDN. Runs entirely in your browser — no signup required.
GZIP vs Brotli Savings Estimator
How it works
GZIP results use the browser's native CompressionStreamAPI (exact). Brotli results are estimated using DEFLATE raw output with a conservative 0.83× factor matching Google's published benchmarks (RFC 7932). Paste your payload above for payload-specific results.
Typical Savings by Asset Type
| Asset Type | GZIP | Brotli |
|---|---|---|
| JSON API response | ~78% | ~84% |
| HTML page | ~72% | ~80% |
| CSS stylesheet | ~75% | ~82% |
| JavaScript bundle | ~68% | ~76% |
| XML / SVG | ~74% | ~81% |
| Plain text / Markdown | ~62% | ~70% |
Benchmarks based on Google's Brotli paper (RFC 7932) and web performance research. Actual savings vary by content structure and repetition.
Why Use Our GZIP vs Brotli Savings Estimator?
Instant GZIP vs Brotli Comparison
Compare GZIP and Brotli savings instantly as you type — no button press needed. Our gzip vs brotli savings estimator uses the native browser CompressionStream API for exact GZIP results and a calibrated estimation model for Brotli, updating in real time.
Secure GZIP vs Brotli Estimator Online
Your text payload never leaves your device when you use this gzip vs brotli savings estimator. 100% client-side processing guarantees complete privacy — no server logs, no data transmission. Safe for API responses, proprietary content, and sensitive payloads.
GZIP vs Brotli Estimator — No Installation
Compare GZIP and Brotli compression savings directly in any modern browser with no software downloads, no plugins, and no account required. The gzip vs brotli savings estimator works on Windows, macOS, Linux, and mobile.
Bandwidth Savings at Scale
See exactly how much bandwidth you save per request, per 1,000 requests, and per 1,000,000 requests for both GZIP and Brotli. The gzip vs brotli savings estimator makes it easy to justify upgrading from GZIP to Brotli on high-traffic endpoints.
Common Use Cases for GZIP vs Brotli Savings Estimator
API Response Compression Planning
Paste your JSON API responses to compare GZIP vs Brotli savings before deciding which algorithm to enable on your server. The gzip vs brotli savings estimator shows the exact bandwidth reduction for your specific payload — typical JSON APIs achieve 78% with GZIP and 84% with Brotli.
Web Performance Optimization
Compare GZIP and Brotli savings for HTML, CSS, and JavaScript assets to prioritize which files benefit most from Brotli. The gzip vs brotli savings estimator helps you build a business case for enabling Brotli on your CDN or web server.
Server Configuration Decisions
Use the gzip vs brotli savings estimator to determine whether the extra CPU cost of Brotli compression is justified for your traffic volume. The bandwidth savings panel shows daily savings at 1K, 1M, and 1B requests — making the ROI calculation straightforward.
GraphQL and REST API Optimization
Paste GraphQL responses or REST API payloads to see how much Brotli saves over GZIP. The gzip vs brotli savings estimator is especially useful for large nested JSON responses where Brotli's static dictionary provides significant additional compression over GZIP.
CDN and Edge Configuration
Evaluate whether to enable Brotli on your CDN (Cloudflare, AWS CloudFront, Fastly) by comparing savings for your actual asset types. The gzip vs brotli savings estimator shows the per-request savings that justify the configuration change.
Bandwidth Cost Reduction Analysis
Calculate monthly bandwidth savings from switching GZIP to Brotli using the gzip vs brotli savings estimator. For high-traffic APIs serving millions of requests per day, even a 5–10% improvement over GZIP translates to significant CDN cost reduction.
Understanding GZIP vs Brotli Compression
What is GZIP vs Brotli Compression?
GZIP (GNU zip) and Brotli are the two dominant HTTP content-encoding algorithms used to compress web assets in transit. GZIP is based on the DEFLATE algorithm (LZ77 + Huffman coding) and has been the web standard since 1996 — supported by every browser, server, and CDN. Brotli was developed by Google and published as RFC 7932 in 2016. It uses a combination of LZ77, Huffman coding, and a static dictionary of common web content patterns — this dictionary gives Brotli a significant advantage on HTML, CSS, JavaScript, and JSON payloads. Our gzip vs brotli savings estimatorcomputes exact GZIP sizes using the browser's native CompressionStreamAPI and estimates Brotli sizes using a calibrated model based on Google's published benchmarks.
How Our GZIP vs Brotli Savings Estimator Works
- 1Paste your text payload: Type or paste any text — JSON, HTML, CSS, JavaScript, XML, SVG, CSV, or plain text — into the input area. You can also upload a text file directly. Four preset payloads let you test instantly without your own data. The gzip vs brotli savings estimator updates live as you type.
- 2Instant browser-based analysis:GZIP compression runs via the browser's native
CompressionStreamAPI — exact results, not estimates. Brotli is estimated using DEFLATE raw output with a conservative 0.83× factor matching Google's benchmarks (RFC 7932). Your data never leaves your device. - 3Read the comparison and plan your server config: The results panel shows GZIP and Brotli sizes, savings percentages, compression ratios, and bandwidth savings at 1K and 1M requests per day. Use the server configuration recommendation to enable the right algorithm for your infrastructure.
Key Differences Between GZIP and Brotli
- Compression ratio:Brotli typically achieves 15–26% better compression than GZIP on web content. The advantage is largest for HTML and JavaScript (where Brotli's static dictionary matches common patterns) and smallest for already-repetitive content like minified JSON.
- Browser support: GZIP is supported by 100% of browsers. Brotli is supported by all modern browsers (Chrome 50+, Firefox 44+, Safari 11+, Edge 15+) but not by very old clients. Brotli only works over HTTPS — browsers do not advertise Brotli support over HTTP.
- CPU cost: Brotli compression at quality 11 (maximum) is significantly slower than GZIP — not suitable for dynamic responses. For static assets, pre-compress with Brotli at build time and serve the pre-compressed file. For dynamic responses, Brotli quality 4–6 is comparable in speed to GZIP.
- Server support: GZIP is built into nginx, Apache, and IIS. Brotli requires the
ngx_brotlimodule for nginx ormod_brotlifor Apache. Cloudflare, AWS CloudFront, and Fastly support Brotli natively with no configuration required.
When to Use GZIP vs Brotli
Use Brotli for static assets (HTML, CSS, JS, JSON, SVG) served over HTTPS — pre-compress at build time with quality 11 for maximum savings. Use GZIPas a fallback for clients that don't support Brotli, and for dynamic API responses where compression speed matters more than ratio. For dynamic responses, Brotli quality 4 provides better compression than GZIP with similar CPU overhead. Use the gzip vs brotli savings estimator to measure the actual savings for your specific payloads before deciding which algorithm to prioritize.
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Frequently Asked Questions About GZIP vs Brotli Savings Estimator
A gzip vs brotli savings estimator compares how much a text payload shrinks under GZIP and Brotli compression, showing the exact byte savings and bandwidth reduction for each algorithm. Our free gzip vs brotli savings estimator online uses the browser's native CompressionStream API for exact GZIP results and a calibrated model for Brotli estimates — results update live as you type.
Brotli results are estimated, not exact. The estimator uses DEFLATE raw output (via the CompressionStream API) with a conservative 0.83× factor derived from Google's published Brotli benchmarks (RFC 7932). Real Brotli quality-11 compression typically achieves 15–26% better compression than GZIP — our estimate uses 17% as a conservative baseline. GZIP results are exact.
Brotli uses a static dictionary of ~13,000 common web content patterns (HTML tags, CSS properties, JavaScript keywords, HTTP headers) that GZIP lacks. This dictionary allows Brotli to represent common web patterns with fewer bits, giving it a 15–26% compression advantage over GZIP on typical web assets. The advantage is largest for HTML and JavaScript.
Absolutely. The gzip vs brotli savings estimator processes everything locally in your browser. Your text payload is never uploaded to any server and never leaves your device — completely safe for API responses containing sensitive data, proprietary content, or confidential business information.
Yes — 100% free, forever. No signup, no account, no premium tier, no payload size limits, and no ads. Compare GZIP and Brotli savings for unlimited payloads completely free.
No — browsers only advertise Brotli support (via the Accept-Encoding: br header) over HTTPS connections. Over plain HTTP, browsers only send Accept-Encoding: gzip, deflate. This is a browser security decision to prevent MITM attacks on compressed content. If your site is HTTP-only, GZIP is your only option.
For static assets pre-compressed at build time, use quality 11 (maximum) — it achieves the best compression ratio and the slow compression speed doesn't matter since it runs once at build time. For dynamic responses compressed on-the-fly, use quality 4–6 which provides better compression than GZIP with similar CPU overhead.
Install the ngx_brotli module (available as a dynamic module in nginx 1.9.11+). Add "brotli on; brotli_comp_level 6; brotli_types text/plain text/css application/json application/javascript text/xml application/xml;" to your server block. For static pre-compressed files, use "brotli_static on;" to serve .br files directly.
There is no artificial size limit. The practical limit depends on your browser's available memory — most modern browsers handle several hundred MB of text without issues. For very large payloads, the live-update debounce (350ms) prevents excessive CPU usage while you type.