base64: A modern Base64 library

A performant, featureful RFC 4648 and 7049-compliant Base64 implementation

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Versions [RSS]	0.0.1.0, 0.1.0.0, 0.2.0.0, 0.3.0.0, 0.3.1.0, 0.3.1.1, 0.4.0, 0.4.1, 0.4.2, 0.4.2.1, 0.4.2.2, 0.4.2.3, 0.4.2.4, 1.0, 1.0.1, 2.0 (info)
Change log	CHANGELOG.md
Dependencies	base (>=4.18 && <4.23), bytestring (>=0.11 && <0.13), deepseq (>=1.4.4.0 && <1.6), text (>=2.0 && <2.3), text-short (>=0.1 && <0.2) [details]
Tested with	ghc ==9.6.7 \|\| ==9.8.4 \|\| ==9.10.3 \|\| ==9.12.4 \|\| ==9.14.1
License	BSD-3-Clause
Copyright	(c) 2019-2026 Emily Pillmore
Author	Emily Pillmore
Maintainer	Emily Pillmore <emilypi@cohomolo.gy>
Uploaded	by topos at 2026-10-13T21:40:49Z
Category	Data
Home page	https://github.com/emilypi/base64
Bug tracker	https://github.com/emilypi/base64/issues
Source repo	head: git clone https://github.com/emilypi/base64.git
Distributions	Arch:1.0, Fedora:1.0, LTSHaskell:1.0, Stackage:1.0
Reverse Dependencies	41 direct, 3981 indirect [details]
Downloads	21601 total (64 in the last 30 days)
Rating	(no votes yet) [estimated by Bayesian average]
Your Rating	λ λ λ
Status	Docs available [build log] Last success reported on 2026-10-13 [all 1 reports]

Base64 encoding and decodings.

For the companion optics and pattern synonyms, see base64-lens.

The following types are supported for both std, padded url-safe, and unpadded url-safe alphabets:

Additionally this library has

Better performance than base64-bytestring for encode and decode.
Optics for handling more complex structures with Base64 representations via the base64-lens package
Checks for both validity and correctness of Base64 and Base64url encodings
Rejects non-canonical encodings that do not roundtrip in other base64 libraries like ZE==.

The library supports GHC 9.6 through 9.14. Its dependencies are base, bytestring, deepseq, text, and text-short.