Web Asset Compression Tools

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.