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B2 Command Line Tool

 Continuous Integration License python versions PyPI version Docs

The command-line tool that gives easy access to all of the capabilities of B2 Cloud Storage.

This program provides command-line access to the B2 service.


The latest documentation is available on Read the Docs.


Detailed instructions on how to install the command line tool can be found here


Homebrew is widely used in the Mac community, particularly amongst developers. We recommend using the B2 CLI Homebrew formula as the quickest setup method for Mac users:

brew install b2-tools


Stand-alone binaries are available for Linux and Windows - this is the most straightforward way to use the command-line tool and is sufficient in most use cases. The latest versions are available for download from the Releases page.

Python Package Index

You can also install it in your python environment (virtualenv is recommended) from PyPI with:

pip install b2

Installing from source

If installing from the repository is needed in order to, for example, check if a pre-release version resolves a bug effectively, it can be installed with:

python3 install

In this case of installing a pre-release, virtualenv is strongly recommended.


b2 authorize-account [-h]  [applicationKeyId] [applicationKey]
b2 cancel-all-unfinished-large-files [-h] bucketName
b2 cancel-large-file [-h] fileId
b2 clear-account [-h]
b2 copy-file-by-id [-h] [--fetchMetadata] [--contentType CONTENTTYPE] [--range RANGE] [--info INFO | --noInfo] [--destinationServerSideEncryption {SSE-B2,SSE-C}] [--destinationServerSideEncryptionAlgorithm {AES256}] [--sourceServerSideEncryption {SSE-C}] [--sourceServerSideEncryptionAlgorithm {AES256}] [--fileRetentionMode {compliance,governance}] [--retainUntil TIMESTAMP] [--legalHold {on,off}] sourceFileId destinationBucketName b2FileName
b2 create-bucket [-h] [--bucketInfo BUCKETINFO] [--corsRules CORSRULES] [--lifecycleRules LIFECYCLERULES] [--fileLockEnabled] [--replication REPLICATION] [--defaultServerSideEncryption {SSE-B2,none}] [--defaultServerSideEncryptionAlgorithm {AES256}] bucketName bucketType
b2 create-key [-h] [--bucket BUCKET] [--namePrefix NAMEPREFIX] [--duration DURATION] [--allCapabilities] keyName [capabilities]
b2 delete-bucket [-h] bucketName
b2 delete-file-version [-h] [fileName] fileId
b2 delete-key [-h] applicationKeyId
b2 download-file-by-id [-h] [--noProgress] [--threads THREADS] [--sourceServerSideEncryption {SSE-C}] [--sourceServerSideEncryptionAlgorithm {AES256}] [--write-buffer-size BYTES] [--skip-hash-verification] [--max-download-streams-per-file MAX_DOWNLOAD_STREAMS_PER_FILE] fileId localFileName
b2 download-file-by-name [-h] [--noProgress] [--threads THREADS] [--sourceServerSideEncryption {SSE-C}] [--sourceServerSideEncryptionAlgorithm {AES256}] [--write-buffer-size BYTES] [--skip-hash-verification] [--max-download-streams-per-file MAX_DOWNLOAD_STREAMS_PER_FILE] bucketName b2FileName localFileName
b2 get-account-info [-h]
b2 get-bucket [-h] [--showSize] bucketName
b2 get-file-info [-h] fileId
b2 get-download-auth [-h] [--prefix PREFIX] [--duration DURATION] bucketName
b2 get-download-url-with-auth [-h] [--duration DURATION] bucketName fileName
b2 hide-file [-h] bucketName fileName
b2 list-buckets [-h] [--json]
b2 list-keys [-h] [--long]
b2 list-parts [-h] largeFileId
b2 list-unfinished-large-files [-h] bucketName
b2 ls [-h] [--long] [--json] [--replication] [--versions] [--recursive] [--withWildcard] bucketName [folderName]
b2 rm [-h] [--dryRun] [--threads THREADS] [--queueSize QUEUESIZE] [--noProgress] [--failFast] [--versions] [--recursive] [--withWildcard] bucketName [folderName]
b2 make-url [-h] fileId
b2 make-friendly-url [-h] bucketName fileName
b2 sync [-h] [--noProgress] [--dryRun] [--allowEmptySource] [--excludeAllSymlinks] [--threads THREADS] [--syncThreads SYNCTHREADS] [--downloadThreads DOWNLOADTHREADS] [--uploadThreads UPLOADTHREADS] [--compareVersions {none,modTime,size}] [--compareThreshold MILLIS] [--excludeRegex REGEX] [--includeRegex REGEX] [--excludeDirRegex REGEX] [--excludeIfModifiedAfter TIMESTAMP] [--destinationServerSideEncryption {SSE-B2,SSE-C}] [--destinationServerSideEncryptionAlgorithm {AES256}] [--sourceServerSideEncryption {SSE-C}] [--sourceServerSideEncryptionAlgorithm {AES256}] [--write-buffer-size BYTES] [--skip-hash-verification] [--max-download-streams-per-file MAX_DOWNLOAD_STREAMS_PER_FILE] [--incrementalMode] [--skipNewer | --replaceNewer] [--delete | --keepDays DAYS] source destination
b2 update-bucket [-h] [--bucketInfo BUCKETINFO] [--corsRules CORSRULES] [--lifecycleRules LIFECYCLERULES] [--defaultRetentionMode {compliance,governance,none}] [--defaultRetentionPeriod period] [--replication REPLICATION] [--fileLockEnabled] [--defaultServerSideEncryption {SSE-B2,none}] [--defaultServerSideEncryptionAlgorithm {AES256}] bucketName [bucketType]
b2 upload-file [-h] [--noProgress] [--quiet] [--contentType CONTENTTYPE] [--minPartSize MINPARTSIZE] [--sha1 SHA1] [--threads THREADS] [--info INFO] [--destinationServerSideEncryption {SSE-B2,SSE-C}] [--destinationServerSideEncryptionAlgorithm {AES256}] [--legalHold {on,off}] [--fileRetentionMode {compliance,governance}] [--retainUntil TIMESTAMP] [--incrementalMode] bucketName localFilePath b2FileName
b2 update-file-legal-hold [-h] [fileName] fileId {on,off}
b2 update-file-retention [-h] [--retainUntil TIMESTAMP] [--bypassGovernance] [fileName] fileId {governance,compliance,none}
b2 replication-setup [-h] [--destination-profile DESTINATION_PROFILE] [--name NAME] [--priority PRIORITY] [--file-name-prefix PREFIX] [--include-existing-files] SOURCE_BUCKET_NAME DESTINATION_BUCKET_NAME
b2 replication-status [-h] [--rule REPLICATION_RULE_NAME] [--destination-profile DESTINATION_PROFILE] [--dont-scan-destination] [--output-format {console,json,csv}] [--noProgress] [--columns COLUMN ONE,COLUMN TWO] SOURCE_BUCKET_NAME
b2 version [-h]
b2 license [-h]

The environment variable B2_ACCOUNT_INFO specifies the sqlite file to use for caching authentication information. The default file to use is: ~/.b2_account_info

For more details on one command: b2 <command> --help

When authorizing with application keys, this tool requires that the key have the 'listBuckets' capability so that it can take the bucket names you provide on the command line and translate them into bucket IDs for the B2 Storage service. Each different command may required additional capabilities. You can find the details for each command in the help for that command.

Parallelism and the --threads parameter

Users with high performance networks, file sets with very small files or high network latency, will usually benefit from increased parallelism. Experiment with using the --threads parameter to increase performance.

Note that using many threads could in some cases be detrimental to the other users on your network.

Docker image

An official docker image is provided for these who want to use B2 Command Line Tool in a docker environment. An example workflow could be (with passing environmental variables):

B2_APPLICATION_KEY=<key> B2_APPLICATION_KEY_ID=<key-id> docker run --rm -e B2_APPLICATION_KEY -e B2_APPLICATION_KEY_ID b2:latest authorize-account
B2_APPLICATION_KEY=<key> B2_APPLICATION_KEY_ID=<key-id> docker run --rm -e B2_APPLICATION_KEY -e B2_APPLICATION_KEY_ID b2:latest create-bucket test-bucket allPrivate
B2_APPLICATION_KEY=<key> B2_APPLICATION_KEY_ID=<key-id> docker run --rm -e B2_APPLICATION_KEY -e B2_APPLICATION_KEY_ID -v <absolute-local-path-to-data>:/data b2:latest upload-file test-bucket /data/local-file remote-file
B2_APPLICATION_KEY=<key> B2_APPLICATION_KEY_ID=<key-id> docker run --rm -e B2_APPLICATION_KEY -e B2_APPLICATION_KEY_ID -v <absolute-local-path-to-data>:/data b2:latest ls test-bucket
B2_APPLICATION_KEY=<key> B2_APPLICATION_KEY_ID=<key-id> docker run --rm -e B2_APPLICATION_KEY -e B2_APPLICATION_KEY_ID -v <absolute-local-path-to-data>:/data b2:latest download-file-by-name test-bucket remote-file /data/local-file-2

or mapping to a directory where account info will be kept:

docker run --rm -it -v <absolute-local-path-to-account-info>:/b2 b2:latest authorize-account
docker run --rm -v <absolute-local-path-to-account-info>:/b2 b2:latest create-bucket test-bucket allPrivate
docker run --rm -v <absolute-local-path-to-account-info>:/b2 -v <absolute-local-path-to-data>:/data b2:latest upload-file test-bucket /data/local-file remote-file
docker run --rm -v <absolute-local-path-to-account-info>:/b2 -v <absolute-local-path-to-data>:/data b2:latest ls test-bucket
docker run --rm -v <absolute-local-path-to-account-info>:/b2 -v <absolute-local-path-to-data>:/data b2:latest download-file-by-name test-bucket remote-file /data/local-file-2


detailed logs

Verbose logs to stdout can be enabled with the --verbose flag.

A hidden flag --debugLogs can be used to enable logging to a b2_cli.log file (with log rotation at midnight) in current working directory. Please take care to not launch the tool from the directory that you are syncing, or the logs will get synced to the remote server (unless that is really what you want to do).

For advanced users, a hidden option --logConfig <filename.ini> can be used to enable logging in a user-defined format and verbosity. An example log configuration can be found here.

In order to see the raw request headers you may export B2_DEBUG_HTTP=1 before calling the cli.

Release History

Please refer to the changelog.

Developer Info

Please see our contributing guidelines.


The command-line tool that gives easy access to all of the capabilities of B2 Cloud Storage







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