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diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,14 @@
+# Editor backup files
+*~
+\#*
+.\#*
+.*.swp
+
+# Python
+*.pyc
+__pycache__/
+
+
+# Local Variables:
+# mode: conf
+# End:
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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index 0000000..ae319c7
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,23 @@
+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution,
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
diff --git a/LICENSE b/LICENSE
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index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0dd6116
--- /dev/null
+++ b/README.md
@@ -0,0 +1,19 @@
+# bitutils
+
+This is a collection of scripts which make working with binary numbers a bit
+easier.
+
+-   `bin` converts its argument (or standard input) to binary.
+-   `hex` converts its argument (or standard input) to hexadecimal.
+-   `bitrule` displays a ruler below its standard input.
+
+This is not an official Google product.
+
+## Example
+
+``` shellsession
+$ bin 12345 | bitrule
+0b11000000111001
+  '|'''|'''|'''|
+   12  8   4   0
+```
diff --git a/bin b/bin
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index 0000000..80b71e3
--- /dev/null
+++ b/bin
@@ -0,0 +1,21 @@
+#!/usr/bin/python3
+# Copyright 2017 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import convert_base
+
+
+if __name__ == '__main__':
+    convert_base.main(bin, '0b', 'bit')
diff --git a/bitrule b/bitrule
new file mode 100755
index 0000000..5724a6f
--- /dev/null
+++ b/bitrule
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+#!/usr/bin/awk -E
+# Copyright 2017 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Usage: bitrule [number_of_characters_to_ignore_at_start
+
+function usage() {
+	print "usage: bitrule [n_chars_to_ignore_at_line_start]" >"/dev/stderr"
+	exiting=1; exit
+}
+
+function repeat(s, n,   r, i) {
+	for (i = 0; i < n; ++i)
+		r = r " "
+	return r
+}
+
+BEGIN {
+	ignore_leading = "none"
+
+	if (ARGC > 2)
+		usage()
+	else if (ARGC == 2) {
+		ignore_leading = ARGV[1]
+		delete ARGV[1]  # don't treat it as a file
+		if (ignore_leading < 0)
+			usage()
+	}
+}
+
+# Track the maximum length of the lines.
+length($0) > max_length { max_length = length($0) }
+
+# Detect lines beginning in '0b', '0x' or '0o'. These are binary representations
+# of numbers and shouldn't have the rule extend through their prefix.
+/^0[box].*/ { is_prefixed = 1 }
+
+{ print }
+
+END {
+	if (exiting)
+		exit exiting
+
+	top = max_length - 1
+
+	if (ignore_leading != "none") {
+		prefix = repeat(" ", ignore_leading)
+		top -= ignore_leading
+	} else if (is_prefixed) {
+		prefix = "  "
+		top -= 2
+	}
+
+	# Print the ruler.
+	printf(prefix)
+	for (i = top; i >= 0; --i)
+		printf(i % 4 ? "'" : "|")
+	printf("\n")
+
+	# Print the numbers.
+	printf("%s%s", prefix, repeat("x", top % 4))
+	for (i = int(top / 4) * 4; i >= 0; i -= 4)
+		printf("%-4d", i)
+	printf("\n")
+}
diff --git a/convert_base.py b/convert_base.py
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index 0000000..a74f672
--- /dev/null
+++ b/convert_base.py
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+# Copyright 2017 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import argparse
+import sys
+
+
+def _convert(to_base, num):
+    return to_base(int(num, 0))[2:]
+
+
+def _prettify(bits, options):
+    result = [options.prefix]
+    if options.width:
+        result.append('0' * max(0, options.width - len(bits)))
+    result.append(bits)
+    return ''.join(result)
+
+
+def main(to_base, prefix, unit_name):
+    parser = argparse.ArgumentParser()
+    parser.add_argument('number', nargs='*', default=None)
+    parser.add_argument(
+        '-w',
+        type=int,
+        help=unit_name+' width to format as',
+        metavar='WIDTH',
+        dest='width')
+    parser.add_argument(
+        '-P',
+        action='store_const',
+        const='',
+        default=prefix,
+        help='disable `'+prefix+'` prefix',
+        dest='prefix')
+    options = parser.parse_args()
+
+    if options.number:
+        for number in options.number:
+            print(_prettify(_convert(to_base, number), options))
+    else:
+        for line in sys.stdin:
+            print(_prettify(_convert(to_base, line.strip()), options))
diff --git a/hex b/hex
new file mode 100755
index 0000000..2cfe969
--- /dev/null
+++ b/hex
@@ -0,0 +1,21 @@
+#!/usr/bin/python3
+# Copyright 2017 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import convert_base
+
+
+if __name__ == '__main__':
+    convert_base.main(hex, '0x', 'word')