Package {resmush}

Title:	Optimize and Compress Image Files with 'reSmush.it'
Version:	1.0.2
Description:	Optimize and compress local and online image files with the 'reSmush.it' 'API' https://resmush.it/api/. Process individual files or entire directories. The 'API' is free for personal use, accepts files smaller than 5 'MB' and supports 'PNG', 'JPEG', 'GIF', 'BMP' and 'TIFF' files.
License:	MIT + file LICENSE
URL:	https://dieghernan.github.io/resmush/, https://github.com/dieghernan/resmush
BugReports:	https://github.com/dieghernan/resmush/issues
Depends:	R (≥ 4.1.0)
Imports:	cli, curl, httr2 (≥ 1.0.0), tools, utils
Suggests:	grid, knitr, png, quarto, testthat (≥ 3.1.7)
VignetteBuilder:	quarto
Config/Needs/website:	dieghernan/gitdevr, xfun, dplyr, tibble, devtools, remotes, pak
Config/roxygen2/markdown:	TRUE
Config/roxygen2/version:	8.0.0
Config/testthat/edition:	3
Config/testthat/parallel:	true
Encoding:	UTF-8
X-schema.org-keywords:	r, compress-images, optimize-images, resmushit, api, r-package, cran, cran-r
NeedsCompilation:	no
Packaged:	2026-07-02 07:36:51 UTC; diego
Author:	Diego Hernangómez [aut, cre, cph]
Maintainer:	Diego Hernangómez <diego.hernangomezherrero@gmail.com>
Repository:	CRAN
Date/Publication:	2026-07-02 09:40:02 UTC

resmush: Optimize and Compress Image Files with 'reSmush.it'

Description

Optimize and compress local and online image files with the 'reSmush.it' 'API' https://resmush.it/api/. Process individual files or entire directories. The 'API' is free for personal use, accepts files smaller than 5 'MB' and supports 'PNG', 'JPEG', 'GIF', 'BMP' and 'TIFF' files.

Author(s)

Maintainer: Diego Hernangómez diego.hernangomezherrero@gmail.com (ORCID) [copyright holder]

Authors:

• Diego Hernangómez diego.hernangomezherrero@gmail.com (ORCID) [copyright holder]

See Also

• resmush_file() optimizes local image files.

• resmush_dir() optimizes image files in directories.

• resmush_url() optimizes online image files.

• The package website provides articles and reference documentation.

• The source code is available on GitHub.

• Report bugs in the issue tracker.

Remove output files from directories

Description

Use with caution. Remove files that match suffix from one or more directories. This is intended to clean output files created by resmush_file() or resmush_dir().

Usage

resmush_clean_dir(dir, suffix = "_resmush", recursive = FALSE)

Arguments

Value

An invisible() NULL. Messages list the files selected for removal.

See Also

resmush_file() and resmush_dir() create the suffixed output files that this function removes.

Examples

# Create a temporary file with a suffix to remove.
png_file <- system.file("extimg/example.png", package = "resmush")
suffix <- "_would_be_removed"
tmp_png <- file.path(
  tempdir(),
  paste0("example", suffix, ".png")
)

file.exists(tmp_png)
file.copy(png_file, tmp_png, overwrite = TRUE)

file.exists(tmp_png)

# Run with the default suffix. This should not remove the file.
resmush_clean_dir(tempdir())

file.exists(tmp_png)

# Use the matching suffix to remove the file.
resmush_clean_dir(tempdir(), suffix = suffix)

file.exists(tmp_png)

Optimize image files in directories

Description

Optimize supported image files in one or more directories with the reSmush.it API. The API is free for personal use and accepts files smaller than 5 MB.

Usage

resmush_dir(
  dir,
  ext = "\\.(png|jpe?g|bmp|gif|tif)$",
  suffix = "_resmush",
  overwrite = FALSE,
  progress = TRUE,
  report = TRUE,
  recursive = FALSE,
  ...
)

Arguments

Value

An invisibly returned data frame with one row per result and columns containing source and destination paths, formatted and raw file sizes, compression ratios and status notes. Returns NULL if no result is available. Successful API calls also write the optimized files to disk.

See Also

• resmush_clean_dir() removes output files created by previous runs.

• The reSmush.it API documentation describes the external service.

Other image optimization functions: resmush_file(), resmush_url()

Examples

# Copy the example directory.
example_dir <- system.file("extimg", package = "resmush")
temp_dir <- tempdir()
file.copy(example_dir, temp_dir, recursive = TRUE)

# Create the destination folder path.
dest_folder <- file.path(tempdir(), "extimg")

# Optimize files non-recursively.
resmush_dir(dest_folder)
resmush_clean_dir(dest_folder)

# Optimize files recursively.
summary <- resmush_dir(dest_folder, recursive = TRUE)

# Inspect the returned optimization summary.
summary[, -c(1, 2)]

# Display the PNG output.
if (require("png", quietly = TRUE)) {
  a_png <- grepl("png$", summary$dest_img)
  my_png <- png::readPNG(summary[a_png, ]$dest_img[2])
  grid::grid.raster(my_png)
}

# Clean up the example files.
unlink(dest_folder, force = TRUE, recursive = TRUE)

Optimize local image files

Description

Optimize one or more local image files with the reSmush.it API. The API is free for personal use and accepts files smaller than 5 MB.

Usage

resmush_file(
  file,
  suffix = "_resmush",
  overwrite = FALSE,
  progress = TRUE,
  report = TRUE,
  qlty = 92,
  exif_preserve = FALSE
)

Arguments

Value

An invisibly returned data frame with one row per result and columns containing source and destination paths, formatted and raw file sizes, compression ratios and status notes. Returns NULL if no result is available. Successful API calls also write the optimized files to disk. If report = TRUE, a summary is displayed in the console.

See Also

• resmush_clean_dir() removes output files created by previous runs.

• The reSmush.it API documentation describes the external service.

Other image optimization functions: resmush_dir(), resmush_url()

Examples

png_file <- system.file("extimg/example.png", package = "resmush")

# Copy to a temporary file for this example.
tmp_png <- tempfile(fileext = ".png")

file.copy(png_file, tmp_png, overwrite = TRUE)

resmush_file(tmp_png)

# Optimize multiple files.
jpg_file <- system.file("extimg/example.jpg", package = "resmush")
tmp_jpg <- tempfile(fileext = ".jpg")

file.copy(jpg_file, tmp_jpg, overwrite = TRUE)

# Display a summary in the console.
summary <- resmush_file(c(tmp_png, tmp_jpg))

# Inspect the returned optimization summary.
summary

# Display the PNG output.
if (require("png", quietly = TRUE)) {
  my_png <- png::readPNG(summary$dest_img[1])
  grid::grid.raster(my_png)
}

# Adjust the JPEG quality level.
resmush_file(tmp_jpg)
resmush_file(tmp_jpg, qlty = 10)

Optimize online image files

Description

Optimize and download one or more online image files with the reSmush.it API. The API is free for personal use and accepts files smaller than 5 MB.

Usage

resmush_url(
  url,
  outfile = file.path(tempdir(), basename(url)),
  overwrite = FALSE,
  progress = TRUE,
  report = TRUE,
  qlty = 92,
  exif_preserve = FALSE
)

Arguments

Value

An invisibly returned data frame with one row per result and columns containing source and destination paths, formatted and raw file sizes, compression ratios and status notes. Returns NULL if no result is available. Successful API calls also write the optimized files to disk. If outfile contains duplicate paths, resmush_url() makes them unique with suffixes such as ⁠_01⁠ and ⁠_02⁠.

See Also

• resmush_clean_dir() removes output files created by previous runs.

• The reSmush.it API documentation describes the external service.

Other image optimization functions: resmush_dir(), resmush_file()

Examples

# Define the base URL.
base_url <- "https://raw.githubusercontent.com/dieghernan/resmush/main/inst/"

png_url <- paste0(base_url, "/extimg/example.png")
resmush_url(png_url)

# Optimize multiple URLs.
jpg_url <- paste0(base_url, "/extimg/example.jpg")

summary <- resmush_url(c(png_url, jpg_url))

# Inspect the returned optimization summary.
summary

# Display the PNG output.
if (require("png", quietly = TRUE)) {
  my_png <- png::readPNG(summary$dest_img[1])
  grid::grid.raster(my_png)
}

# Adjust the JPEG quality level.
resmush_url(jpg_url)
resmush_url(jpg_url, qlty = 10)