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Thumbor
Thumbor · Rio de Janeiro, Brazil
What it is
Thumbor is a free, open-source image service for on-demand cropping, resizing, and flipping. Its smart mode checks for faces when choosing a crop, then uses feature detection if it finds none. You can chain filters such as brightness, contrast, grayscale, red-eye, and blur. Thumbor supports WebP delivery to browsers that accept the format, along with AVIF support and responsive images. It lists file, HTTP, Redis, and Mongo options for loaders and storage, and can be extended with custom filters, storage, loaders, engines, detection, and optimizers. Image URLs can be signed with a SECURITY_KEY and HMAC to help prevent tampering. The default HTTP loader uses HTTP; HTTPS and strict HTTPS options are also described. Thumbor is distributed as a Python package, and current releases require Python 3.10 or newer. It runs through an API, on Linux, or in a self-hosted setup. The project lists an MIT license and is based in Rio de Janeiro, Brazil.
For and against
For
- Free, open-source service with an MIT license
- On-demand cropping, resizing, and flipping
- Smart crops check for faces first
- Supports WebP, AVIF, and responsive images
- Custom loaders, storage, filters, and optimizers
Against
- Current releases require Python 3.10 or newer
- Default HTTP loader uses HTTP
The verdict
Thumbor offers image transformation and delivery options for teams managing their own service. Its Python requirement and HTTP loader default are worth considering when choosing a setup.
Who it suits
Thumbor suits developers and operations teams who want to host image processing themselves. Its customization options may also fit designers and project managers working with image delivery.
Plans and prices
Thumbor
Open-source image service; self-hosted
Read 9 Oct 2026 · github.com
On the record
- Automatic optimization
- Yesgithub.com · read 20 Sep 2026
- AVIF support
- Yesgithub.com · read 20 Sep 2026
- Extensibility
- Thumbor supports custom filters, storages, image loaders, engines, detection, and optimizers.thumbor.readthedocs.io · read 9 Oct 2026
- Filters
- Filters can be chained and include brightness, contrast, grayscale, red-eye, and blur.thumbor.org · read 9 Oct 2026
- HTTPS loading
- The documentation says the default HTTP loader uses HTTP and describes HTTPS and strict HTTPS loader options.thumbor.readthedocs.io · read 9 Oct 2026
- Image formats
- Thumbor supports WebP and can serve it to browsers that support the format.thumbor.org · read 9 Oct 2026
- Image processing
- Thumbor provides on-demand image cropping, resizing, and flipping.thumbor.org · read 9 Oct 2026
- Installation
- Thumbor is distributed as a Python package and current releases require Python 3.10 or newer.thumbor.readthedocs.io · read 9 Oct 2026
- Intended users
- The site describes use cases for developers, operations teams, designers, and project managers.thumbor.org · read 9 Oct 2026
- Open source
- The project repository describes Thumbor as an open-source photo thumbnail service and lists an MIT license.github.com · read 9 Oct 2026
- Responsive images
- Yesgithub.com · read 20 Sep 2026
- Security reporting
- The security page asks users who find flaws or vulnerabilities to contact the team or create an issue.thumbor.readthedocs.io · read 9 Oct 2026
- Smart cropping
- Smart mode uses face detection first and feature detection if it finds no faces.thumbor.readthedocs.io · read 9 Oct 2026
- Storage and loaders
- The site lists file, HTTP, Redis, and Mongo implementations for loaders and storages.thumbor.org · read 9 Oct 2026
- URL signing
- A SECURITY_KEY can sign image URLs with HMAC to help prevent URL tampering.thumbor.readthedocs.io · read 9 Oct 2026
- URL transformations
- Yesgithub.com · read 20 Sep 2026
