qrtool is a command-line utility for encoding or decoding QR code.
cargo install qrtool
OS | Package manager | Command |
---|---|---|
Any | Nix | nix-env -iA nixpkgs.qrtool |
The release page contains pre-built binaries for Linux, macOS and Windows.
Please see BUILD.adoc.
Encode a string in a QR code:
qrtool encode "QR code" > output.png
Generate this image:
Decode a QR code from this image:
qrtool decode output.png
Output:
QR code
Use -t
option to change the format of the generated image. The format is
png
(default), svg
or terminal
(to the terminal as UTF-8 string).
qrtool encode -o output.svg -t svg "QR code"
Generate this image:
Use --variant
option to change the variant of the generated QR code. The
variant is normal
(default) or micro
(Micro QR code).
qrtool encode -v 3 --variant micro "QR code" > output.png
Generate this image:
Use --foreground
and --background
options to change the foreground and
background colors of the generated image. These options takes a CSS color
string such as brown
, #a52a2a
or rgb(165 42 42)
. The default foreground
color is black and the background color is white of CSS's named colors.
qrtool encode --foreground brown --background lightslategray "QR code" > output.png
Generate this image:
qrtool decode
supports decoding a QR code from the following image formats:
To support decoding from SVG image, the decode-from-svg
feature must be
enabled at compile time. Note that the SVG image is rasterized before scanning.
Use -t
option to specify the image format. If this option is not specified,
the image format is determined based on the extension or the magic number.
Input this WebP image:
Decode a QR code from the WebP image:
qrtool decode input.webp
# or
qrtool decode -t webp input.webp
Output:
QR code
--generate-completion
option generates shell completions to stdout.
The following shells are supported:
bash
elvish
fish
nushell
powershell
zsh
Example:
qrtool --generate-completion bash > qrtool.bash
Both qrtool encode
and qrtool decode
can read from stdin and output to
stdout.
The image output by qrtool encode
is not optimized. For example, a PNG image
is always output as the 32-bit RGBA format. If you want to reduce the image
size or optimize the image, use an optimizer such as oxipng
or
svgcleaner
.
Optimize the output PNG image:
qrtool encode "QR code" | oxipng - > output.png
Optimize the output SVG image:
qrtool encode -t svg "QR code" | svgcleaner -c - > output.svg
If you want to save the encoded image in an image format other than PNG or SVG, or decode an image in an unsupported image format, convert it using a converter such as ImageMagick.
Read Cargo.toml
from stdin and save the encoded result as a JPEG XL image:
cat Cargo.toml | qrtool encode | magick png:- output.jxl
Decode this image and print the result using bat
:
magick output.jxl png:- | qrtool decode | bat -l toml
Please see the following:
Please see CHANGELOG.adoc.
Please see CONTRIBUTING.adoc.
This program is inspired by qrencode
and zbarimg
.
Copyright © 2022–2024 Shun Sakai (see AUTHORS.adoc)
- This program is distributed under the terms of either the Apache License 2.0 or the MIT License.
- Some files are distributed under the terms of the Creative Commons Attribution 4.0 International Public License.
This project is compliant with version 3.0 of the REUSE Specification. See copyright notices of individual files for more details on copyright and licensing information.