# zstd | Meta | Knowledge Base | Instagit

Zstandard - Fast real-time compression algorithm

GitHub Stars: 27.8k

Repository: https://github.com/facebook/zstd

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## Articles

### [What Is Long Distance Matching in Zstd? A Complete Technical Guide](/facebook/zstd/what-is-zstd-long-distance-matching)

Discover how long distance matching in Zstd compresses data efficiently by indexing up to 128 MiB back. Learn this powerful technique for large offset pattern detection.

- Tags: deep-dive
- Published: 2026-09-09

### [How to Enable Parallel Compression in Zstandard (zstd) with ZSTD_c_nbWorkers](/facebook/zstd/enable-parallel-compression-zstd-nbworkers)

Boost zstd compression speed by enabling parallel compression. Learn how to set ZSTD_c_nbWorkers in ZSTD_CCtx_setParameter to utilize multi-threading for faster data compression.

- Tags: how-to-guide
- Published: 2026-09-09

### [ZSTD_c_windowLog: Controlling Sliding Window Size in Zstandard Compression](/facebook/zstd/purpose-of-zstd_c_windowlog-parameter)

Master ZSTD_c_windowLog to control Zstandard's sliding window size. Optimize your compression ratio by understanding how this parameter impacts the encoder's search for matching sequences.

- Tags: internals
- Published: 2026-09-09

### [How to Set Advanced Compression Parameters in Zstandard (zstd)](/facebook/zstd/how-to-set-advanced-zstd-compression-parameters)

Master Zstandard advanced compression parameters with ZSTD_CCtx_setParameter. Gain fine-grained control over memory, heuristics, and multi-threading for optimal performance.

- Tags: how-to-guide
- Published: 2026-09-09

### [When Is Zstandard Dictionary Compression Most Effective?](/facebook/zstd/when-is-zstd-dictionary-compression-effective)

Discover when Zstandard dictionary compression is most effective. Maximize compression for small files with statistical patterns to boost throughput for logs and protocol buffers.

- Tags: deep-dive
- Published: 2026-09-09

### [How to Load a Dictionary into Zstandard (zstd) Compression and Decompression Contexts](/facebook/zstd/how-to-load-dictionary-into-zstd-contexts)

Learn how to load a dictionary into zstd compression and decompression contexts using by-copy, by-reference, or by creating reusable pre-processed objects. Optimize your zstd usage today.

- Tags: how-to-guide
- Published: 2026-09-09

### [Optimizing Zstd Dictionary Training: Complete Parameter Guide](/facebook/zstd/zstd-dictionary-training-optimization-parameters)

Master Zstd dictionary training with our comprehensive parameter guide. Optimize compression efficiency and resource usage by tuning segment size, d-mer size, and more.

- Tags: deep-dive
- Published: 2026-09-09

### [How to Build a Zstd Dictionary from a Buffer: In-Memory Training Guide](/facebook/zstd/how-to-build-zstd-dictionary-from-buffer)

Learn to build a Zstd dictionary from an in-memory buffer using fastCover algorithm and ZDICT_trainFromBuffer() for optimal compression. Get your compressed dictionary directly.

- Tags: how-to-guide
- Published: 2026-09-09

### [How Do Zstd Compression Strategies Affect Performance? A Technical Guide to the 9 Algorithmic Levels](/facebook/zstd/how-zstd-compression-strategies-affect-performance)

Explore Zstd compression strategies from level 1 to 9. Understand how different algorithms balance CPU usage and storage efficiency to optimize your data compression performance.

- Tags: performance
- Published: 2026-09-09

### [Zstd Compression Strategies: A Complete Guide to the ZSTD_strategy Enum](/facebook/zstd/what-are-zstd-compression-strategies)

Explore zstd compression strategies with the ZSTD_strategy enum. Discover seven algorithms from ZSTD_fast to ZSTD_btoptimal balancing speed, memory, and compression ratio for your needs.

- Tags: deep-dive
- Published: 2026-09-09

### [What Is the Default Compression Level for Zstd? A Complete Guide to ZSTD_CLEVEL_DEFAULT](/facebook/zstd/default-zstd-compression-level)

Discover the default compression level for zstd, which is level 3, defined by ZSTD_CLEVEL_DEFAULT. Learn how to optimize your compression.

- Tags: deep-dive
- Published: 2026-09-09

### [Zstd Compression Levels Explained: Complete Guide to Speed and Ratio Settings](/facebook/zstd/available-zstd-compression-levels)

Explore zstd compression levels 1-22 and fast negative levels to optimize speed and ratio. Discover the default level 3 and ultra settings for maximum compression.

- Tags: deep-dive
- Published: 2026-09-09

### [How to Use Decompression Contexts (DCtx) in Zstandard](/facebook/zstd/how-to-use-zstd-decompression-contexts)

Learn how to use Zstandard decompression contexts DCtx to efficiently decode multiple ZSTD frames without reallocating memory, boosting throughput in frequent decoding tasks.

- Tags: how-to-guide
- Published: 2026-09-09

### [What Do ZSTD_CONTENTSIZE_UNKNOWN and ZSTD_CONTENTSIZE_ERROR Mean in Zstandard?](/facebook/zstd/zstd-content-size-unknown-error-meaning)

Understand ZSTD_CONTENTSIZE_UNKNOWN and ZSTD_CONTENTSIZE_ERROR in Zstandard. Learn how these sentinel values indicate unspecified or corrupted decompressed sizes in zstd API.

- Tags: documentation
- Published: 2026-09-09

### [How to Get the Decompressed Size of a Zstd Frame](/facebook/zstd/how-to-get-zstd-decompressed-frame-size)

Learn how to get the decompressed size of a Zstd frame using ZSTD_getFrameContentSize. Extract original uncompressed size from the header without full decompression.

- Tags: how-to-guide
- Published: 2026-09-09

### [How to Use the Basic Zstd Decompression API: A Complete Guide](/facebook/zstd/how-to-use-zstd-basic-decompression-api)

Master the basic Zstd decompression API with this guide. Learn to use ZSTD_decompress, allocate buffers, and check for errors for efficient data handling.

- Tags: how-to-guide
- Published: 2026-09-09

### [How to Handle Input and Output Buffers in Zstd Streaming](/facebook/zstd/zstd-streaming-input-output-buffer-handling)

Learn to manage Zstd input and output buffers for efficient streaming compression and decompression. Use ZSTD_inBuffer and ZSTD_outBuffer structures for incremental data processing.

- Tags: how-to-guide
- Published: 2026-09-09

### [How to Compress Unbounded Data with the Zstd Streaming API](/facebook/zstd/how-to-compress-unbounded-data-zstd-streaming)

Compress unbounded data efficiently with the Zstandard streaming API. Learn how to use ZSTD_CStream and ZSTD_compressStream2 for incremental processing of any data size without upfront length.

- Tags: how-to-guide
- Published: 2026-09-09

### [How the Zstandard Streaming Compression API Works: A Complete Technical Guide](/facebook/zstd/how-zstd-streaming-compression-api-works)

Explore the zstd streaming compression API. Learn how ZSTD_CCtx, ZSTD_inBuffer, ZSTD_outBuffer, and ZSTD_compressStream2 efficiently handle large data inputs without full memory loading.

- Tags: deep-dive
- Published: 2026-09-09

### [When to Reuse Compression Contexts in Zstandard (zstd): A Performance Guide](/facebook/zstd/when-to-reuse-zstd-compression-contexts)

Learn when to reuse zstd compression contexts for better performance. Avoid repeated memory allocations and improve speed by preserving match-finder tables and skipping dictionary reloads.

- Tags: performance
- Published: 2026-09-09

### [How to Create and Use Compression Contexts (CCtx) in Zstandard](/facebook/zstd/how-to-create-and-use-zstd-compression-contexts)

Learn to create and use compression contexts CCtx in Zstandard. Discover one-shot and streaming compression methods, parameter configuration, and resource management with ZSTD functions.

- Tags: how-to-guide
- Published: 2026-09-09

### [How to Use the Zstandard Simple Compression API in C](/facebook/zstd/how-to-use-zstd-simple-compression-api)

Learn to use the Zstandard simple compression API in C with ZSTD_compress and ZSTD_decompress. This guide simplifies one-shot compression and decompression for your projects.

- Tags: how-to-guide
- Published: 2026-09-09