Compression Benchmark Tool
Upload a file or paste text to compare GZIP, Brotli, ZSTD (estimated), and DEFLATE compression side by side. See exact compressed sizes, savings percentages, compression ratios, and timing for each algorithm. Interactive SVG charts help you visualize the size vs. speed tradeoff. All processing runs locally in your browser - files never leave your device. Free, no signup required.
Upload a file or paste text to compare GZIP, Brotli, ZSTD (estimated), and DEFLATE compression. See exact compressed sizes, timing, and an interactive chart showing which algorithm performs best on your data - all processing runs locally in your browser.
Why Use Our Compression Benchmark Tool?
Making informed compression choices requires real data - not guesses. Our tool runs actual algorithms on your content so you can compare results with confidence.
Four-Way Algorithm Comparison
Compare GZIP, Brotli, DEFLATE, and ZSTD (estimated) side by side. See exact compressed sizes, savings percentages, and compression ratios for every algorithm on your data.
Real Compression Timing
Measure actual compression time for GZIP, Brotli, and DEFLATE using the browser's native CompressionStream API. ZSTD timing is estimated from benchmark data.
Interactive Comparison Charts
Visualize size and time tradeoffs with SVG bar charts. See at a glance which algorithm saves the most space and how long each takes - perfect for choosing the right algorithm for your use case.
100% Private Browser Processing
Your data never leaves your device. All compression runs locally using the browser's native CompressionStream API with no server uploads, no file size limits, and no signup required.
Common Use Cases
From web performance tuning to API optimization - here is how developers and engineers use our compression benchmark tool to make data-driven decisions.
Web Performance Optimization
Compare GZIP vs Brotli on your CSS, JavaScript, and HTML assets. Choose the algorithm that gives the best size reduction for your specific content to minimize page load times.
API Payload Tuning
Benchmark compression algorithms on your JSON and XML API responses. Find the optimal algorithm that balances bandwidth savings with server CPU overhead for high-traffic endpoints.
Server Configuration Planning
Decide which compression algorithms to enable on your web server (Nginx, Apache, Cloudflare). Use real data from your content to compare savings and choose the right configuration.
Mobile App Data Optimization
Benchmark compression on API payloads and static assets for mobile apps. Reduced payload sizes mean faster load times and lower data usage for users on cellular connections.
CDN & Edge Caching Decisions
Test how different compression algorithms perform on your static assets. Use the results to configure CDN caching policies, pre-compressed asset strategies, and origin server settings.
Compression Algorithm Research
Compare the efficiency of different compression algorithms on various data types. Understand the size vs. speed tradeoffs to make informed technical decisions for your projects.
About the Compression Benchmark Tool
Everything you need to know about how we compare compression algorithms on your data.
What Is a Compression Benchmark Tool?
A compression benchmark tool compares how different compression algorithms perform on your specific data. Instead of relying on generic benchmarks, you upload your actual files or paste your content and get real compressed sizes and timing measurements. This helps you choose the best algorithm for your use case - whether that's GZIP for broad compatibility, Brotli for maximum savings on web content, DEFLATE for ZIP archives, or ZSTD for modern high-performance compression needs.
How Algorithms Are Compared
The tool runs actual compression using the browser's native CompressionStream API for GZIP, DEFLATE, and Brotli. ZSTD results are estimated from GZIP measurements using known benchmark ratios since ZSTD is not yet available as a browser compression API. Each algorithm reports: compressed size in bytes, compression ratio (compressed/original), savings percentage (how much space was saved), and compression time in milliseconds. Shannon entropy is also calculated to show the theoretical compressibility limit of your data.
Understanding the Results
Lower compressed size means better compression, but timing matters too. GZIP offers wide compatibility and fast compression but moderate savings. Brotli provides 15-25% better compression than GZIP on text but is slower. DEFLATE (raw) is similar to GZIP without the header overhead. ZSTD estimates modern compression performance. Use the savings bars to compare at a glance, the timing bars to understand server CPU impact, and the interactive chart for a detailed visual comparison.
Privacy & Technical Notes
All compression runs entirely in your browser using the CompressionStream API. Your files and text never leave your device - there are no server uploads. Brotli compression requires a browser that supports the "br" CompressionStream format (Chrome, Firefox, Edge). ZSTD is estimated since it is not available as a browser API. For very large files, the practical limit is your browser's available memory. The tool works offline when the page has been loaded once.
Related Tools
JSON Key Shortener
Shorten verbose JSON keys to single letters or abbreviated forms - shows size reduction and provides a downloadable key mapping file for restoration. Free online JSON key shortener.
JSON vs MessagePack Size Comparison
Compare JSON byte size vs MessagePack encoding for any payload - shows exact savings, type-by-type breakdown, and MessagePack hex preview. Free online JSON vs MessagePack comparison.
String Decompressor (GZIP/LZ)
Decompress GZIP+Base64, DEFLATE+Base64, and LZ-String compressed payloads back to readable text - supports all three LZ-String variants. Free online string decompressor.
ZIP File Extractor
Extract files from any ZIP archive client-side - browse contents, preview text files, download individual files or all at once. Free online ZIP extractor, no signup required.
Frequently Asked Questions
Everything you need to know about the Compression Benchmark Tool.
The tool compares four compression algorithms: GZIP (standard DEFLATE + CRC32 header commonly used in HTTP compression and .gz files), Brotli (modern web compression algorithm offering 15-25% better compression than GZIP on text), DEFLATE (raw LZ77 + Huffman encoding used in ZIP and PNG), and ZSTD (Zstandard - a modern high-performance algorithm, estimated from GZIP results since browser APIs do not support it yet).
GZIP, DEFLATE, and Brotli results are measured in real-time using your browser's native CompressionStream API - these are actual compressed sizes and real timing measurements. ZSTD results are estimated from GZIP results using established benchmark ratios since ZSTD is not available as a browser CompressionStream format. The estimate assumes ZSTD is typically 5-15% better than GZIP at default compression level.
Absolutely. All compression happens entirely in your browser using the Web CompressionStream API. Your files and pasted text never leave your device - no data is sent to any server. This makes the tool suitable for sensitive data including API responses, proprietary content, and personal files.
For web content (HTML, CSS, JavaScript, JSON): Brotli typically offers the best compression but at higher CPU cost - use it for static assets that can be pre-compressed. For dynamic API responses: GZIP offers a good balance of speed and savings. For ZIP archives: DEFLATE is the standard. For high-throughput systems: ZSTD offers modern performance with fast decompression. Your specific results will vary - use this tool to benchmark your actual content.
There is no artificial file size limit. The practical limit is your browser's available memory since files are read into memory for compression. For most use cases - source code, documents, API payloads, and web assets - the tool handles files of any size without issues. Very large files (hundreds of MB) may be limited by available RAM.
Shannon entropy measures the average information content per byte in your data, ranging from 0 to 8 bits/byte. Low entropy (0-3) means highly repetitive data that compresses well. High entropy (7-8) means random or already-compressed data that cannot be reduced further. The tool shows entropy alongside compression results to help you understand why certain algorithms perform better or worse on your data.
JPEG, MP4, and most media formats already use internal compression. Running GZIP, Brotli, or DEFLATE on these files adds very little benefit - the entropy will be near 8 bits/byte. This is expected behavior and confirms the algorithms are working correctly; the data is simply already compressed.
Yes - 100% free, forever. No signup, no account, no premium tier, no usage limits, and no ads. Run as many benchmarks as you need on files of any type.
Yes. Once the page has been loaded, the tool works fully offline. All compression logic runs client-side using standard browser APIs with no server dependencies. The page is a static Next.js export that does not require any backend.