Optimizilla vs Thumbor

Optimizilla is a web image-compression tool for JPEG, PNG, WebP, GIF, and SVG files. It processes images in the browser, supports batch work, and lets users adjust quality and preview the result before saving. The compressor uses format-specific handling: JPEG quality is inferred from quantization tables with a default target of 80; PNG files become PNG8 with up to 256 colors while preserving transparency; and animated GIF optimization reduces the palette while retaining frames. Compressed images have EXIF, GPS, and camera metadata removed. The site says files are not uploaded to its servers. Its free plan is free, with no registration, daily limit, or watermark, and is described as allowing unlimited compression. The pricing page also lists a 25 MB maximum file size and batches of up to 50 files for Free. Pro costs $9 a month and includes unlimited file size and batch uploads, among other tools. Enterprise pricing is custom and not listed; its plan includes custom integrations, without naming partners.

Thumbor is a self-hosted image service for on-demand cropping, resizing and flipping. Its smart mode looks for faces when choosing a crop and falls back to feature detection if it finds none. Filters can be chained, including brightness, contrast, grayscale, red-eye and blur. Thumbor supports WebP delivery to browsers that can display the format, and its listed capabilities include responsive images, automatic optimization and AVIF support. File, HTTP, Redis and Mongo implementations are available for loaders and storage. The service can be extended with custom filters, storage, loaders, engines, detection and optimizers. A SECURITY_KEY can be used to sign image URLs with HMAC to help guard against tampering. The default HTTP loader uses HTTP; the documentation also describes HTTPS and strict HTTPS options. Thumbor is distributed as a Python package, and current releases require Python 3.10 or newer. The project describes it as open source and lists an MIT license. Its platforms include API, Linux and self-hosted use. The listed plan costs nothing.