Compress Tools

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.

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.

Decompress GZIP+Base64, DEFLATE+Base64, and LZ-String compressed payloads back to readable text — supports all three LZ-String variants. Free online string decompressor.

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.

Extract files from .tar.gz and .tgz archives client-side — browse contents, preview text files, download individual files or all at once. Free online TAR.GZ extractor, no signup required.

Enter original and compressed sizes to calculate compression ratio, space savings, percentage reduction, expansion factor, and bits per byte. Supports B/KB/MB/GB units with 6 preset examples. Free online compression ratio calculator, no signup required.

Upload any file and see its compressibility score — runs real GZIP, DEFLATE, and LZ77 compression with Shannon entropy analysis. Free online file compression ratio analyzer.

Calculate the Shannon entropy of any text or file — shows theoretical compression ceiling, incompressibility score (0–100), byte frequency distribution, and top symbols. Free online entropy analyzer, no signup required.

Calculate exactly how much size Base64 encoding adds — shows raw vs Base64 vs Base64+GZIP size. Supports text input, file upload, and Base64 decode modes. Free online Base64 size calculator.

Paste HTTP response headers and body to see uncompressed vs GZIP vs Brotli size, validate Content-Encoding, check Vary headers, and get compression recommendations. Free online HTTP response size analyzer, no signup required.

Generate the correct Content-Encoding, Vary, and Cache-Control headers for GZIP, Brotli, and Zstandard server responses — with Nginx, Apache, Express.js, and Cloudflare config snippets. Free online content-encoding header generator.

Paste an Accept-Encoding request header and decode which compression algorithms the client supports, q-values, and the optimal Content-Encoding to serve. Free online accept-encoding header analyzer, no signup required.

Upload any image to get a compression-guided recommendation for JPEG, WebP, AVIF, or PNG — shows estimated size savings, quality score, and browser support for each format. Free online image format picker, no signup required.

Upload original and compressed images to calculate SSIM score, PSNR, and MSE — quantifies quality loss from compression with per-channel R/G/B breakdown. Free online image SSIM quality scorer, no signup required.

Encode a binary delta between a base file and a target file — shows COPY vs INSERT instruction breakdown, delta size vs target size, and round-trip verification. Useful for understanding incremental update compression. Free online delta compression tool.

Visualize LZ77 sliding window compression step-by-step on any text input — see every (offset, length, next-char) token with interactive highlighting and plain-English explanations. Free online LZ77 compression visualizer, no signup required.

Verify that a ZIP or GZIP archive is not corrupted — checks CRC32 checksums for all file entries client-side. Shows stored vs computed CRC32 per entry with OK / CORRUPTED status. Free online archive integrity checker.

Generate a production-ready Nginx Brotli compression configuration — configure compression level (1–11), brotli_static mode, MIME types, GZIP fallback, and installation method. Includes installation steps, curl verification, and pre-compression shell script. Free online Nginx Brotli config generator, no signup required.

Generate a production-ready webpack.config.js snippet with GZIP and Brotli pre-compression using compression-webpack-plugin — configure levels, threshold, minRatio, asset patterns, and module format. Includes install command, Nginx serve snippet, and build verification. Free online webpack compression plugin config generator, no signup required.

Estimate Brotli compression savings for any text payload and compare against GZIP and DEFLATE — shows exact byte savings, compression ratio, and bandwidth impact at scale. Free online Brotli compression estimator.

Estimate how small a set of files will compress to as ZIP — calculates Shannon entropy per file and predicts DEFLATE compression ratio. Free online ZIP size estimator, no signup required.

Paste any text and instantly see GZIP compressed size, compression ratio, and byte savings — useful for API payload planning and HTTP transfer optimization. Free online GZIP ratio checker.

Compare GZIP and Brotli compression savings for any text payload side by side — exact GZIP results via CompressionStream API and estimated Brotli results based on RFC 7932 benchmarks. Free online GZIP vs Brotli estimator.

Enter your service worker precache URL list to estimate total cache storage, GZIP and Brotli sizes per asset type, and get compression recommendations. Free online service worker cache size estimator, no signup required.

Convert between bytes, KB, MB, GB, TB, and binary units (KiB, MiB, GiB, TiB) with decimal and binary mode toggle. Supports bits, bytes, and all standard storage units. Free online file size converter, no signup required.

Select your file type and use case to get the best compression algorithm recommendation — covers GZIP, Brotli, ZIP, WOFF2, and format-specific codecs for 25+ file types. Free online compression recommender, no signup required.

Encode and decode text using Run-Length Encoding — shows compression ratio, longest run, and a verdict on whether RLE is effective for your input. Free online RLE encoder decoder, no signup required.

Model an API endpoint's response payload and estimate compressed wire size across GZIP and Brotli at various client loads — shows daily bandwidth savings with cache hit rate modeling. Free online REST API response size estimator.

Predict compressed output size from file type, content entropy, and chosen algorithm — GZIP, Brotli, DEFLATE, LZ4, Zstandard, XZ. Covers 24 file types with confidence ratings. No upload needed. Free online file size estimator after compression.

Enter file size, compression ratio, and monthly requests to calculate exact monthly and annual bandwidth savings — plus CDN cost reduction across AWS CloudFront, Google Cloud CDN, Azure CDN, Cloudflare, Fastly, and BunnyCDN. Free online bandwidth savings calculator, no signup required.

Estimate Zstandard compression savings vs GZIP and Brotli for any text payload — shows all 7 compression levels (1–22) with size, savings percentage, and a level tradeoff table. Free online ZSTD compression estimator.

Build a custom compression dictionary from sample data and compress a target string — shows dictionary vs GZIP vs dictionary+GZIP savings side by side. Free online dictionary compression simulator, no signup required.

Enter any text to build its Huffman tree, generate optimal prefix-free binary codes for each character, and see exact bit savings vs fixed 8-bit ASCII encoding — with interactive SVG tree and code table. Free online Huffman encoding visualizer, no signup required.

Visualize the GZIP and DEFLATE compression level vs size vs speed curve for levels 1–9 — enter file size and content type to see compressed sizes, speeds, and time-to-compress at each level. Helps choose optimal server config. Free online compression tradeoff visualizer, no upload needed.

Generate optimized Nginx GZIP compression configuration with recommended MIME types, compression levels, proxy settings, and gzip_static support — ready-to-paste nginx.conf block with misconfiguration warnings. Free online nginx gzip config generator.

Generate Next.js next.config.js or next.config.mjs with optimized GZIP and Brotli compression settings — supports Vercel, Node.js, Docker, and static export deployments with deployment-specific warnings. Free online Next.js compression config generator.

Generate Cloudflare-compatible compression settings — Brotli, Auto Minify, caching rules, Cache-Control headers, and a Worker script for custom compression headers. Covers all Cloudflare plans. Free online Cloudflare compression guide, no signup required.

Generate vite-plugin-compression configuration for pre-compressing Vite build assets to GZIP and Brotli — produces vite.config.ts with framework-specific imports and nginx serving config. Free online Vite compression config generator, no signup required.

Build Cache-Control headers for compressed assets — sets max-age, s-maxage, stale-while-revalidate, and Vary: Accept-Encoding correctly. Config snippets for Nginx, Apache, Cloudflare, CloudFront, Fastly, and Vercel. Free online CDN cache-control header builder, no signup required.

Generate Express.js compression middleware configuration using the compression npm package — configurable level, threshold, custom filter, and Vary header. CommonJS, ESM, and TypeScript output. Free online Express.js compression middleware generator.

Generate a Lambda@Edge Node.js function for CloudFront that adds Brotli and GZIP compression — includes IAM trust policy, IAM execution policy, and AWS CLI deployment steps. Free online Lambda@Edge compression script generator.

Generate CloudFront behavior configuration for Brotli and GZIP compression — cache policies, response headers policies, and correct Cache-Control headers. Console steps, Terraform, CloudFormation, CDK, and AWS CLI output. Free online CloudFront compression config guide, no signup required.

Generate Vercel configuration for serving compressed static assets with correct Cache-Control and Vary headers — vercel.json, next.config.js, or Edge Middleware output. Free online Vercel edge compression config generator.

Bundle multiple folders into a ZIP archive that preserves your complete directory hierarchy — uses webkitdirectory folder picker and DEFLATE level 9 compression via fflate. Free online multi-folder ZIP creator.

Bundle and compress multiple files into a .tar.gz archive entirely in the browser using fflate — GZIP level 9 compression, POSIX ustar format, instant download. Free online TAR.GZ creator.

Compress any single file to .gz format using the native browser CompressionStream API — zero server needed. Shows original size, compressed size, and compression ratio. Free online GZIP compressor.

Compress any binary file — executable, database, firmware, or document — to ZIP (fflate, levels 1–9) or GZIP (CompressionStream) in the browser. Shows compression ratio. Free online binary file compressor.

Open and browse the contents of any ZIP archive without extracting — see file names, sizes, compression ratios, and methods in a sortable, searchable table. Free online ZIP file inspector.

Merge multiple ZIP archives into a single ZIP in the browser — deduplicates files with identical paths (first-wins) and shows a full conflict report. Free online ZIP merger.

Convert a ZIP archive to TAR.GZ format entirely in your browser — extracts ZIP contents and re-packages them as a .tar.gz using fflate GZIP level 9. Free online ZIP to TAR.GZ converter.

Split a large ZIP archive into multiple smaller ZIP parts of a configurable max size — entirely in your browser using JSZip. Presets from 1 MB to 100 MB, custom KB/MB input, independent extractable parts. Free online ZIP splitter.

Compress data using raw DEFLATE algorithm and view output as binary download, hex string, or Base64 encoded string — entirely in your browser using fflate. Free online DEFLATE compressor.

Compress NDJSON/JSONL log files using GZIP — shows line count, valid/invalid JSON lines, and compression ratio. Optionally minifies each JSON line before compression. Free online NDJSON JSONL compressor, no signup required.

Compress HTTP Archive (HAR) files by removing response bodies, cookies, and headers — then GZIP compress for 80–95% size reduction. Shows per-entry analysis. Free online HAR file compressor, no signup required.

Compress text using LZ77/LZ-String — ideal for localStorage, cookies, and URL state. Base64, UTF-16 (localStorage-optimised), and URI Component output. Decompression mode included. Free online LZ-String compressor.

Compress a JSON object or string before storing in localStorage — shows space saved, UTF-16 char count, and % of 5 MB browser limit used. Ready-to-use code snippet included. Free online localStorage compression helper.

Estimate IndexedDB storage usage for JSON payloads using the structured clone algorithm — shows how much LZ-String compression reduces quota usage. Four-way size comparison with code snippet. Free online IndexedDB payload size estimator.

Compress cookie value strings using LZ-String and instantly see whether the compressed value fits within the 4096-byte browser cookie limit. Real-time size bar, Set-Cookie header preview, Base64 and URI Component output. Free online cookie compressor.

Compress any text with GZIP and encode to Base64 — produces a URL-safe compressed string for query params, cookies, and localStorage. Free online text compressor.

Compress CSS by removing whitespace, comments, redundant semicolons, and applying shorthand optimizations — hex color normalisation, zero-value shortening, font-weight shorthand. Free online CSS compressor.

Maximum HTML compression — removes all optional whitespace, collapses boolean attributes, strips comments, removes optional closing tags, and inlines style/script whitespace. Free online aggressive HTML compressor.

Compress inline SVGs, base64 images, and JSON data blocks embedded in HTML — shows per-asset savings and replaces each asset in the output HTML. Free online inline asset compressor.

Advanced CSS compression — merges duplicate selectors, removes vendor prefix duplicates, collapses shorthand properties, and strips all whitespace and comments. Free online advanced CSS compressor.

Strip whitespace, comments, and CDATA sections from XML — configurable options, shows byte savings and compression ratio. Free online XML compressor.

Remove blank lines, trailing whitespace, and unnecessary quoting from CSV — configurable options, shows byte savings and row count. Free online CSV compressor.

Strip comments and whitespace from Rust source files — preserves raw string literals (r"...", r#"..."#) and doc comments (///, //!). Free online Rust compressor.

Remove whitespace and comments from GraphQL schema and query files — single-line collapse mode for persisted queries, shows wire-size savings. Free online GraphQL compressor.

Minify GraphQL query strings and estimate wire size with and without GZIP — four-way size comparison (plain/GZIP × original/minified), single-line APQ mode. Free online GraphQL response compressor.

Strip TypeScript type annotations, interfaces, type aliases, and generics to produce clean JavaScript — shows compiled JS size vs original TS size. Free online TypeScript compressor.

Remove all whitespace from JSON and show exact byte savings — also shows GZIP wire size for true API transfer savings. Validates JSON as a side effect. Free online JSON compressor.

Compress Lottie animation JSON files by removing hidden layers, unused assets, empty properties, and whitespace — shows per-optimization KB savings. Compatible with lottie-web, lottie-react, lottie-react-native. Free online Lottie JSON compressor.

Minify JavaScript and generate a Source Map v3 file — download both the compressed .min.js and its .map file as a ZIP. Remove comments, collapse whitespace, remove console.log. Free online JS compressor with source map.

Remove comments and blank lines from YAML files — ideal for Kubernetes manifests, Helm charts, and CI/CD configs. Shows exact byte savings and line count reduction. Free online YAML compressor.

Strip blank lines, trailing spaces, HTML comments, and optional syntax from Markdown files — shows byte savings and line count reduction. Free online Markdown compressor.

Remove comments and blank lines from Go source files — preserves raw string literals, interpreted strings, and rune literals. Shows byte savings and line count reduction. Free online Go compressor.

Remove comments and blank lines from Terraform HCL files — preserves heredoc strings and template expressions. Shows byte savings and line count reduction. Free online Terraform HCL compressor.

Strip comments and whitespace from Apache .htaccess and httpd.conf files — preserves RewriteRule patterns. Shows byte savings and line count reduction. Free online Apache config compressor.

Remove comments and blank lines from .htaccess files — preserves RewriteRule patterns, shows byte savings, and includes directive analysis (RewriteRules, security headers, cache directives). Free online .htaccess compressor.

Convert YAML to minified JSON — typically 20–40% smaller wire size for configuration delivery APIs. Uses js-yaml for accurate parsing. Multi-document YAML support. Free online YAML to compact JSON compressor.

Remove comments and whitespace from PHP scripts — preserves heredoc/nowdoc strings, shows size reduction and compression ratio. Free online PHP compressor.

Strip comments and whitespace from C and C++ source files — preserves string literals, character literals, C++11 raw strings, and preprocessor directives. Shows byte savings and line count reduction. Free online C/C++ compressor.

Compress TSV files by removing blank lines and normalizing whitespace — shows exact byte savings, row count reduction, and validates column consistency. Free online TSV compressor.

Remove comments and excess whitespace from Swift source files — preserves raw strings, multi-line strings, and nested block comments. 6 configurable options. Free online Swift compressor.

Strip comments and blank lines from Kotlin source files — removes single-line, multi-line, and KDoc comments while preserving string literals. Shows size savings and line count reduction. Free online Kotlin compressor.

Strip comments and excess whitespace from R scripts — preserves string literals, removes # comments, blank lines, and trailing whitespace. Shows size reduction and line count savings. Free online R script compressor.

Consolidate RUN layers, remove comments, and compress Dockerfiles — reduces Docker image layer count and shows estimated layer size impact. Free online Dockerfile compressor.

Remove comments and blank lines from TOML config files — preserves all string literals and multi-line strings. Useful for embedded device configuration and CI/CD pipelines. Free online TOML compressor.

Remove comments and excess whitespace from Nginx config files — preserves string literals, shows size savings for config management repos. Free online Nginx config compressor.

Strip comments, blank lines, and trailing whitespace from robots.txt files — shows exact byte savings, directive count, and User-agent group count. Free online robots.txt compressor.

Paste code in any language and auto-detect syntax to apply the correct comment/whitespace stripping — supports 28 languages including JS, Python, Go, Rust, Swift, SQL, YAML, TOML, and more. Free online multi-language code compressor.

Compress WebSocket message payloads using permessage-deflate (RFC 7692) simulation — shows exact byte savings and bandwidth impact at scale. Supports DEFLATE, GZIP, and zlib. Free online WebSocket compressor.

Upload a CSS bundle and compress it — shows minified size, exact GZIP size, and Brotli size with ready-to-use nginx and Apache server configuration snippets. Free online CSS bundle compressor.

Paste any JSON API response and get actionable suggestions — remove nulls, strip empty arrays/objects, shorten verbose keys. Shows exact byte savings per optimization and GZIP wire size. Free online API payload size optimizer, no signup required.

Compress Server-Sent Events data fields using LZ-String Base64 encoding — reduces streaming bandwidth for JSON-heavy event payloads. Shows per-event byte savings. Free online SSE payload compressor, no signup required.

Compress GeoJSON files by reducing coordinate decimal precision and removing null properties — shows size vs accuracy tradeoff. Supports all geometry types. Free online GeoJSON compressor.

Paste a webpack stats JSON and visualize module sizes — highlights which dependencies contribute most to bundle size with optimization recommendations. Free online webpack bundle size visualizer.

Compress TopoJSON files by reducing coordinate decimal precision — shows file size at 6 precision levels (1–6 decimal places) with null property removal. Free online TopoJSON compressor.

Input HTML, CSS, and JS content and estimate total uncompressed and GZIP-compressed page transfer size — with per-asset breakdown and performance budget check. Free online web page size estimator.

Upload a favicon set and analyze total size — recommends removing redundant sizes and switching to SVG favicon. Identifies obsolete ICO and PNG sizes. Free online favicon bundle analyzer.

Extract critical above-the-fold CSS from HTML and compress it for inline embedding — eliminates render-blocking CSS and improves LCP scores. Free online critical CSS extractor, no signup required.

Upload a CSS sprite sheet PNG and recompress it using color palette quantization — shows KB savings for legacy sprite setups. Free online image sprite compressor, no signup required.

Compress HTML email code by removing whitespace, comments, and redundant inline styles — stays under Gmail 102 KB limit. Live size indicator. Free online email HTML compressor, no signup required.

Compress SVG files containing SMIL animations — strips redundant animation keyframes, removes editor metadata (Inkscape/Illustrator/Sketch), and optimizes path data. Free online SVG animation compressor, no signup required.

Upload a WebAssembly .wasm file and analyze its section sizes — shows which sections (code, data, debug) contribute most to file size with optimization recommendations. Free online WASM binary analyzer, no signup required.

Compress JavaScript and CSS source map (.map) files with GZIP and Brotli — shows size savings, parses source map metadata, and generates nginx, Apache, and CDN server configuration. Free online source map compressor, no signup required.

Compress RSS and Atom XML feeds by removing whitespace and comments — reduces feed size for CDN caching cost and faster subscriber polling. Supports RSS 2.0 and Atom. Free online RSS feed compressor, no signup required.

Compress server log files (NGINX, Apache, CloudFront, IIS) to GZIP in the browser — log files achieve 85–95% compression. Useful for log archiving, sharing, and analysis prep. Free online log file compressor, no signup required.

Compress OpenAPI 3.x and Swagger 2.0 JSON specs by removing descriptions, examples, and x- extensions — useful for SDK generation pipelines and API gateway imports. Free online OpenAPI compressor, no signup required.

Re-compress Minecraft world region files (.mca) at maximum ZLIB level 9 — reduces world size for sharing and backup. Fully compatible with Anvil format (Minecraft 1.2.1+). Free online Minecraft map compressor, no signup required.

Strip debug sections, name tables, and build metadata from WebAssembly binaries — reduces deployable WASM size without affecting runtime functionality. Free online WASM size optimizer, no signup required.

Compress AMP HTML pages by removing non-AMP compliant comments and excess whitespace — minifies style amp-custom while preserving AMP boilerplate. Includes AMP validation checks. Free online AMP HTML compressor.

Compress GLTF/GLB 3D model files by removing metadata, minifying JSON, and stripping unused extensions — with full model analysis showing meshes, materials, and extensions. Free online GLTF/GLB compressor.

Compress individual assets extracted from an APK (icons, images, XML layouts, JSON files) and show size savings per asset. Free online APK asset compressor, no signup required.

Compress and resize images to @1x, @2x, and @3x React Native asset densities and download as ZIP. Free online React Native asset compressor, no signup required.

Compress and package images into Flutter asset density variants (1x, 2x, 3x) with the correct directory structure and pubspec.yaml snippet output. Free online Flutter asset compressor, no signup required.

Calculate PWA precache size from a URL list and show which assets should be excluded to meet your cache budget. Free online PWA cache budget calculator, no signup required.

Compress all web assets (HTML, CSS, JS, JSON-LD, SVGs, base64 images) as a bundle optimized for 3G mobile network delivery — shows per-asset savings and estimated load time improvement. Free online mobile web performance compressor.

Compress images to fit iOS app upload limits — App Store (4 MB), iMessage (5 MB), Mail (20 MB), or custom 1–2 MB limits. HEIC-aware with fallback JPEG guidance. Free online compress image for iOS upload tool, no signup required.

Convert TTF and OTF fonts to WOFF format for legacy browser compatibility — lossless repackaging, batch conversion with ZIP download. Free online TTF to WOFF converter, no signup required.

Convert OTF fonts to WOFF2 format for web delivery — Brotli compression reduces font size by 30–50% with full OpenType feature support. Free online otf to woff2 converter, no signup required.

Upgrade WOFF fonts to WOFF2 for 30% smaller file sizes and better browser compression support — uses Brotli compression. Free online WOFF to WOFF2 compressor, no signup required.

Compress icon fonts (Font Awesome, Material Icons, Bootstrap Icons) to only the icons you actually use — rebuilds the cmap table to remove unused glyph mappings. Free online icon font compressor, no signup required.

Reduce a variable font to a static instance — freeze axis values (weight, width, slant) and strip variable tables (fvar, gvar, HVAR) for a smaller static font. Free online variable font instancer, no signup required.

Enter a Google Font name and character set — downloads a locally-hostable WOFF2 subset for GDPR-safe self-hosting. Generates @font-face CSS snippet instantly. Free online Google Fonts subset downloader, no signup required.

Upload a TTF or OTF font and compare file sizes across TTF, WOFF, WOFF2, and subsetted WOFF2 side by side — with a download button for each format. Free online font compression comparison tool, no signup required.

Strip TrueType hinting instructions (cvt, fpgm, prep, hdmx, LTSH, VDMX, gasp) from TTF and OTF fonts — reduces file size by 2–15% with no visual impact on modern high-DPI screens. Free online font hinting remover, no signup required.

Upload any font file (TTF, OTF, WOFF, WOFF2) and see file size, glyph count, table breakdown, OpenType feature list, and compression opportunity. Free online font file size analyzer.

Generate optimized Nginx GZIP compression configuration with recommended MIME types, compression level, proxy settings, and gzip_vary — for http, server, or location blocks. Free online Nginx GZIP config generator, no signup required.

Generate Apache mod_deflate GZIP compression configuration for .htaccess, httpd.conf, or VirtualHost — with recommended MIME types, browser exclusions, and Vary header. Free online Apache mod_deflate config generator, no signup required.

Generate Apache mod_brotli configuration with quality settings, MIME type filters, and GZIP fallback for httpd.conf, VirtualHost, Directory, or .htaccess. Free online Apache mod_brotli config generator, no signup required.

Step-by-step checklist to configure AWS S3 and CloudFront to serve pre-compressed GZIP and Brotli static assets — with AWS CLI commands, Terraform snippets, and verification commands. Free online S3 compression checklist, no signup required.

Paste a Dockerfile to analyze each RUN instruction estimated layer contribution, detect size-bloating patterns, and get an optimized Dockerfile with fixes applied. Free online Docker image layer size analyzer, no signup required.