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Image Tool

Convert an image

Convert your images from one format to another (JPEG, PNG, WebP) with quality control.

Convert an image in DocuNest: 100% local processing on Windows, macOS, and Linux. Automatable via the docunest CLI.

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Convert an image
Preview of Convert an image in DocuNest, offline PDF app

Features

Conversion between JPEG, PNG, and WebP
Output quality control
Preservation of original dimensions
Fully local processing

Use cases

1

Web optimization

Convert your PNGs to WebP to reduce size while maintaining quality.

2

Compatibility

Convert a WebP to JPEG for software that does not support the WebP format.

3

Transparency

Switch from JPEG to PNG to add transparency in a graphics editor.

Command line

Same result as the interface, in one command. Nothing leaves your machine.

docunest — zsh

local
# Convert to WebP
❯ docunest img convert -i photo.png --format webp --quality 85 -o photo.webp
✓ Done — file written locally, no network upload

Complete CLI documentation →

Frequently asked questions

Which formats are supported?
JPEG, PNG, and WebP for both input and output.
Is transparency preserved?
Yes, if the output format supports it (PNG, WebP). Transparency is lost in JPEG.
Does conversion degrade quality?
Quality depends on the chosen format and level. PNG is lossless; JPEG and WebP are lossy but adjustable.

Similar tools

📷

Compress an image

Reduce the size of your images by adjusting the compression quality, with no visible change.

🖼️

Crop an image

Crop your images by defining a precise crop area using coordinates.

📸

PDF to images

Convert each page of a PDF into a high-resolution image (PNG, JPEG, or WebP).

Stop sending your PDFs to the cloud.

Download DocuNest: the complete editor, 7-day trial, no credit card, no files leaving your machine.

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No account required, no data collected.

Windows.exe · Windows 10+macOS.dmg · macOS 12+ · Apple Silicon

Linux

Install a system package, or use the AppImage if you prefer a portable version.

DEBDebian / Ubuntu.deb · system installRPMFedora / RHEL.rpm · system installAPPAppImagePortable, no install

Your installation in 3 steps

About a minute to set up: afterwards, everything runs offline on your machine.

0/3

  1. File downloaded

    Pick your system above: the download starts right away.

  2. Open the file

    In Downloads, double-click DocuNest_…_setup.exe and follow the installer.

  3. Run your first job

    Open a PDF and try a tool: merge, redact, convert, everything stays on your machine, no account needed.

Shortcut of the day

Try them as soon as the app opens

CtrlK

Opens the tool palette

Windows 10+, macOS 12+ (Apple Silicon), Linux (deb / rpm / AppImage)