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Codecs read bytes from strangers. Our crates compile with #![forbid(unsafe_code)], take resource limits and cooperative cancellation, and are fuzzed continually.
Set limits for any image you did not produce; a decoder fails cleanly instead of taking the process down.
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JPEG, WebP, AVIF, JPEG XL, PNG, GIF, HEIC and more, each with its own crate. As far as we know, our JPEG XL encoder and our full WebP codec were the first in Rust.
Add the crate for each format you need.
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JPEG AI and Cool-chic, both learned codecs, and SVT-AV1 ported to Rust. As far as we know, JPEG AI and SVT-AV1 were firsts in Rust.
These crates are unreleased: try JPEG AI in the browser first.
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IMI is our own image format, built for fast, independently addressable decoding. It decodes at gigapixels per second.
The format is not frozen yet; files written today may not decode with a later version.
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zensim, our perceptual metric, is trained on human-labelled image-quality data. We score encodes with it to tune each codec's size against quality.
zensim is on crates.io; use it to pick quality settings for your own images.
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A server that processes images on request, a CLI and bindings for build steps, crates for your own code, or a prompt for your coding agent.
Pick a path in the Integrate section below.
Formats
Each format has its own crate. ↔ encode and decode, ← decode only.
zenavif · zenravif · zenrav1e · rav1d-safe
format not frozen yet
wraps our fork of an existing library
built on existing libraries
built on existing libraries
not yet public
built on existing libraries
built on existing libraries
Integrate
Imageflow Server resizes, crops and re-encodes images as they are requested, and caches the results.
imageflow_tool (in Imageflow) and the .NET, Node and Go bindings process images in build steps and batch jobs.
Depend on the codec crate for each format, or on the processing crates directly. Each topic names the crate to start with.
Point it at llms.txt: every crate with its version, license, docs and README.
> Use Imazen's libraries to make our image pipeline safe and fast. Start with https://www.imazen.io/llms.txt and check each crate's license. Products
Use them under their open-source licenses, or with a commercial license. Open-source projects and companies with fewer than 5 employees and under $1M revenue can get a key for $1.
An image server for .NET: resize, crop, convert and optimize images on the fly from URL commands, with caching and request signing. Runs as a microservice, serverless, or inside an ASP.NET app.
Use it when you want images processed on request, close to your existing .NET stack.
The image processing engine (Rust, with a C API) behind Imageflow Server, plus imageflow_tool for the command line.
Use it when you process images ahead of time, in batch jobs, or from another language through the bindings.
The long-running .NET image server and library that many ASP.NET sites still depend on.
Use it when you maintain an existing ImageResizer deployment.
Open source
JPEG
Encoders, decoder and YUV conversion, in safe Rust. Start with zenjpeg.
WebP
Lossy and lossless WebP, plus libwebp bindings. Start with zenwebp.
AVIF & AV1
The AVIF container, three AV1 encoders and a decoder. Start with zenavif.
JPEG XL
Encoder, decoder, GPU kernels and an inspector. Start with jxl-encoder.
HDR & gain maps
Ultra HDR gain maps and tone mapping. Start with zentone.
Learned codecs
JPEG AI and Cool-chic, ported to safe Rust. Unreleased. Start with zenjpegai.
HEIC, RAW & more formats
HEIC, camera RAW, TIFF, PDF, SVG, JPEG 2000 and bitmaps. Start with heic.
Codec API & pipeline
The shared codec traits and the streaming pipeline that ties the codecs together. Start with zencodec.
Processing
Resize, filter, blend, quantize, crop and enhance. Start with zenresize.
Pixels & color
Pixel formats, transfer functions and color conversion. Start with zenpixels.
Compression
DEFLATE, Zopfli, Zstandard and xxHash. Start with zenflate.
Quality metrics
Perceptual quality metrics, used to tune the codecs. Start with zensim.
Codec pickers
Choose the codec and quality for each image. Start with zenpredict.
SIMD & Rust foundations
Safe SIMD, cooperative cancellation, error tracing and benchmarking. Start with archmage.
Every project, with versions and licenses: github.com/imazen/imazen
In use
As reported by each registry, captured 2026-10-27.
10K+
Deployments
19+
Years in Production
0
Memory Safety CVEs
Companies like yours save time and money with Imageflow.
For nearly two decades, Imazen software has helped organizations of all sizes get to market faster and reach more customers — even those on bad wifi.
Scott Hanselman Principal Program Manager at Microsoft
Craig Boal Web Development Manager at A Top 20 USA Retailer
Eric Stubbs CTO at uGurus
Eilev Hagen System Developer at InCreo Interactive Creations
Dorian Collier Developer at De/esea
Brice Long Owner at Blue Fin Solutions
Jonathan Awotwi Developer at GroupeeLove
Articles & News
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