# Facebook BitMap Codec

> Facebook BitMap Codec encodes and decodes Facebook web API parameter values using the project's reverse-engineered bitmap, run-length and custom Base64 scheme. Its Python module exposes a FacebookCodec class for converting ID lists to encoded strings and back across parameters including __dyn and __csr.

- Type: Tool
- Targets: Website
- Category: Website analysis tools
- Relationship: Foundation tool
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-06
- Original resource: <https://github.com/NiceDayZc/FacebookCodec>
- Primary source: <https://github.com/NiceDayZc/FacebookCodec/blob/035ad8cd386f6c5a102f0d4ca303ae62e5434f6b/README.md>
- Catalog page: <https://awesomerea.org/resources/facebookcodec/>
- Record JSON: <https://awesomerea.org/resources/facebookcodec/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/facebookcodec/index.md)

## Requirements & limits

- **Prerequisites:** Python 3.8+ and the FCodec.py module are required.
- **Limits:** The author claims lossless conversion and compatibility with the listed bitmap parameters.
- **License:** No licence file in the repository.

## Primary sources

1. <https://github.com/NiceDayZc/FacebookCodec/blob/035ad8cd386f6c5a102f0d4ca303ae62e5434f6b/README.md>

## More in Websites

- [DevLens Ultra](https://awesomerea.org/resources/devlens-ultra/index.md) · Tool
- [AppThreat wasm-tools](https://awesomerea.org/resources/appthreat-wasm-tools/index.md) · Tool
- [web-crawler ReverseAgent](https://awesomerea.org/resources/web-crawler-reverse-agent/index.md) · Tool
- [Mirrorframe](https://awesomerea.org/resources/mirrorframe/index.md) · Tool
- [unwebpack-sourcemap](https://awesomerea.org/resources/unwebpack-sourcemap/index.md) · Tool
- [Wirebrowser](https://awesomerea.org/resources/wirebrowser/index.md) · Tool

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.